HVAC Pumps

Revision 8 · Aug 29, 2026 +1760 −1202

SynC Standards Team — Specifier (Platform Standards) ✓ OfficialDiscloses employment SynC (SynC Platform Team)

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−---

−title: HVAC Pumps

−category: Mechanical / Piping & Pumps

−toc_depth: 3

−description: >

− When to use: Centrifugal pumps for HVAC service in commercial, institutional, and industrial buildings. Covers closed-loop heating hot water (HHW) and chilled water (CHW) pumps, and open-loop condenser water (CW) pumps serving cooling towers. Configurations addressed include end-suction (long-coupled and close-coupled), in-line (close-coupled and split-coupled), horizontal split-case (base-mounted, double-suction), vertical multi-stage in-line, and vertical turbine (vertical line-shaft) pumps for cooling tower sump service. Pumps from approximately 1 HP through 500 HP at 1750 RPM or 3500 RPM nominal speeds.

−

− Not intended for: Plumbing booster pumps and domestic hot water recirculation pumps (governed by plumbing standards, not this HVAC standard). Fire pumps governed by NFPA 20. Sanitary lift station and sewage ejector pumps. Refrigerant compressors and refrigerant circulation pumps (governed by refrigerant equipment standards). Positive displacement pumps for chemical injection or fuel oil service. Pumps integral to packaged HVAC equipment such as chillers, boilers, or packaged cooling towers — those pumps are governed by the respective equipment standard. Hydronic piping connected to pumps is covered in [[sync/hydronic-piping]]; variable frequency drives for pump motors are covered in [[sync/hvac-variable-frequency-drives]]; water treatment for the pumped fluid is covered in [[sync/hvac-water-treatment]]; testing and balancing of the pumped system is covered in [[sync/testing-adjusting-and-balancing]].

−---

−

−# Scope {toc}

−

−## This specification covers centrifugal pumps for HVAC service in commercial, institutional, and industrial buildings. {note}

−## Equipment covered includes the pump assembly (casing, impeller, shaft, bearings, mechanical seal or packing, and coupling), the pump motor, the base or frame, vibration isolation provisions, and the factory-mounted accessories furnished as part of the pump assembly. {note}

−## Both closed-loop pumping applications — heating hot water (HHW) and chilled water (CHW) — and open-loop applications — condenser water (CW) circulating through cooling towers — are addressed. {note}

−

−## The boundary of work under this standard is the pump assembly itself, from the suction flange or grooved connection through the discharge flange or grooved connection, including the integral motor, baseplate or frame, coupling guard, and any factory-mounted accessories. {note}

−## Suction and discharge piping connected to the pump is covered in [[sync/hydronic-piping]]. {note}

−## Variable frequency drives on pump motors, including motor cable length and filter requirements that affect pump motor selection, are covered in [[sync/hvac-variable-frequency-drives]]. {note}

−## Chemical treatment of the pumped fluid is covered in [[sync/hvac-water-treatment]]. {note}

−## Open-loop condenser water systems require additional Legionella risk management addressed in [[sync/hvac-water-treatment]] in accordance with ASHRAE 188. {note}

−

−## A centrifugal pump is a simple machine, but its long-term reliability depends on disciplined attention to selection, installation, and commissioning; the most common pump failures in commercial buildings are not material defects but installation and operation errors — misaligned couplings, inadequate net positive suction head, cavitation from incorrect impeller trim, and seal failures from running dry or against a closed discharge valve. {note}

−

−## Governing Standards {toc}

−

−### Performance ratings shall conform to ANSI/HI 1.1-1.2 for rotodynamic (centrifugal) pumps.

−

−### Net positive suction head requirements shall conform to ANSI/HI 9.6.1.

−

−### Factory pump testing shall conform to ANSI/HI 14.6.

−

−### Energy efficiency shall conform to ASHRAE 90.1.

−

−### Where the pump serves an open-loop condenser water system, building water management requirements of ASHRAE 188 apply to the connected system.

−

−### Motor design and inverter-duty rating shall conform to NEMA MG 1.

−

−### Electrical installation shall conform to NFPA 70 (NEC).

−

−### Where the pump is provided with an integral variable frequency drive, the drive shall additionally conform to [[sync/hvac-variable-frequency-drives]].

−

−# Referenced Standards {toc}

−

−## Equipment, materials, and installation shall comply with the latest adopted edition of the following unless a specific edition is cited.

−

−## Where conflicts exist between referenced standards, the more stringent requirement shall govern unless the Engineer of Record directs otherwise in writing.

−

−## Reference List {toc}

−

−| Standard | Title |

−|----------|-------|

−| ANSI/HI 1.1-1.2 | Rotodynamic Centrifugal Pumps — Nomenclature and Definitions |

−| ANSI/HI 1.3 | Rotodynamic Centrifugal Pumps for Design and Application |

−| ANSI/HI 1.4 | Rotodynamic Centrifugal Pumps for Manuals Describing Installation, Operation, and Maintenance |

−| ANSI/HI 9.6.1 | Rotodynamic Pumps — Guideline for NPSH Margin |

−| ANSI/HI 9.6.3 | Rotodynamic Pumps — Guideline for Allowable Operating Region |

−| ANSI/HI 9.6.4 | Rotodynamic Pumps — Guideline for Vibration Measurements and Allowable Values |

−| ANSI/HI 14.6 | Rotodynamic Pumps for Hydraulic Performance Acceptance Tests |

−| ANSI/HI 20.3 | Rotodynamic Pumps — Guideline for Efficiency Prediction |

−| ASME B73.1 | Specification for Horizontal End Suction Centrifugal Pumps for Chemical Process |

−| ASME B16.1 | Gray Iron Pipe Flanges and Flanged Fittings (Classes 25, 125, and 250) |

−| ASME B16.5 | Pipe Flanges and Flanged Fittings — NPS 1/2 through 24 |

−| ANSI/ASHRAE/IES 90.1 | Energy Standard for Buildings Except Low-Rise Residential Buildings |

−| ANSI/ASHRAE 188 | Legionellosis: Risk Management for Building Water Systems |

−| AHRI Guideline B | Guideline for Pumping System Energy Efficiency |

−| NEMA MG 1 | Motors and Generators (Part 31 — Definite Purpose Inverter-Fed Polyphase Motors) |

−| NEMA 250 | Enclosures for Electrical Equipment (1000 Volts Maximum) |

−| NFPA 70 | National Electrical Code (NEC), Article 430 |

−| IBC | International Building Code (seismic restraint per applicable edition) |

−| ASCE 7 | Minimum Design Loads and Associated Criteria for Buildings and Other Structures |

−| NETA ATS | Acceptance Testing Specifications for Electrical Power Equipment (applies to integrated VFDs) |

−| MSS SP-58 | Pipe Hangers and Supports — Materials, Design, Manufacture, Selection, Application, and Installation |

−

−# Submittals {toc}

−

−## Action Submittals {toc}

−

−### The Contractor shall submit the following for the Engineer's review and approval prior to procurement, comprising pump product data, certified performance curves, selection and NPSH documentation, motor and seal data, materials of construction, baseplate, vibration isolation, coupling, seismic, factory test, and coordination submittals:

−

−- Pump product data sheets including model designation, casing pattern, configuration, and weight

−- Certified pump performance curves for each pump tag, plotted at the design rotative speed, showing head versus flow, efficiency, brake horsepower, and required NPSH (NPSHr) across the full operating range from shutoff to runout, with the design operating point clearly identified

−- Selection report identifying the design flow, design head, the selected impeller diameter (trimmed dimension), pump efficiency at the design point, motor brake horsepower at the design point, and the percent of best efficiency point (BEP) flow at which the pump will operate

−- Net positive suction head available (NPSHa) calculation by the Engineer of Record showing the margin between NPSHa and NPSHr per ANSI/HI 9.6.1 at the design operating point and at runout

−- Motor data sheets including nameplate ratings, efficiency at 50%, 75%, and 100% load, power factor, service factor, insulation class, and inverter-duty rating per NEMA MG 1 Part 31 where applicable

−- Mechanical seal product data identifying seal type, face and seat materials, elastomer material, and pressure-temperature rating

−- Materials of construction for casing, impeller, shaft, shaft sleeve, wear rings, and seal components for each pump

−- Baseplate and grouting details for base-mounted pumps, including baseplate material, anchor bolt pattern, leveling provisions, and recommended grout type

−- Vibration isolation product data including static deflection, natural frequency, and isolation efficiency at the pump operating speed

−- Coupling and coupling guard product data; couplings shall be flexible elastomeric, gear, or disc type as appropriate for the application

−- Seismic restraint calculations and details where required by the applicable building code

−- Factory test reports per ANSI/HI 14.6 where witness or certified hydrostatic and performance testing is specified

−- Coordination drawings showing pump location, minimum suction piping straight-run requirement, discharge piping arrangement, clearances for impeller and motor removal, and access for routine maintenance

−

−```datasheet

−label: Action Submittals Required

−type: checkbox

−options:

− - "Pump product data and configuration"

− - "Certified pump performance curves"

− - "Pump selection report (impeller trim, efficiency, BHP, % BEP)"

− - "NPSHa calculation with margin per HI 9.6.1"

− - "Motor data sheets (efficiency, service factor, inverter-duty)"

− - "Mechanical seal product data"

− - "Materials of construction"

− - "Baseplate and grouting details"

− - "Vibration isolation product data"

− - "Coupling and guard product data"

− - "Seismic restraint calculations"

− - "Factory test reports (HI 14.6) where witness testing specified"

− - "Coordination drawings showing clearances and access"

−default: "Pump product data and configuration"

−```

−

−### Fabrication and shipment shall not proceed until action submittals have been reviewed and returned.

−

−## Closeout Submittals {toc}

−

−### At substantial completion, the Contractor shall provide the following before pumps are accepted.

−

−- Operation and maintenance manuals for each pump model, including manufacturer's installation, operation, and maintenance instructions per ANSI/HI 1.4

−- As-built pump nameplate data for each installed pump including serial number, installed impeller diameter, and motor serial number

−- Factory test certificates per ANSI/HI 14.6 where applicable

−- Field startup reports including measured flow, measured discharge pressure, measured suction pressure, calculated total dynamic head, motor amperage at the operating point, and verification against the design point

−- Coupling alignment records documenting cold alignment and post-thermal-growth alignment for base-mounted pumps

−- Vibration baseline measurements at startup for each pump 25 HP and above

−- Warranty documentation correlating serial number, installation date, and warranty expiration date for each pump

−- Spare parts inventory list with manufacturer part numbers

−

−```datasheet

−label: Closeout Submittals Required

−type: checkbox

−options:

− - "Operation and maintenance manuals per ANSI/HI 1.4"

− - "As-built pump nameplate data"

− - "Factory test certificates per ANSI/HI 14.6"

− - "Field startup reports verified against design point"

− - "Coupling alignment records (cold and post-thermal-growth)"

− - "Vibration baseline measurements (pumps 25 HP and above)"

− - "Warranty documentation correlating serial number and dates"

− - "Spare parts inventory list with part numbers"

−default: "Operation and maintenance manuals per ANSI/HI 1.4"

−```

−

−# Quality Assurance {toc}

−

−## Manufacturer Qualifications {toc}

−

−### Pumps shall be the products of a manufacturer with a minimum of ten years of continuous experience designing and producing centrifugal pumps for commercial and institutional HVAC service.

−

−### The manufacturer shall maintain an ISO 9001 certified quality management system.

−

−### Replacement parts and factory service support shall be available for the pump model line for a minimum of fifteen years from the date of manufacture.

−

−## Single-Source Responsibility {toc}

−

−### For each pump assembly, the pump, motor, baseplate or frame, coupling, coupling guard, and integral accessories shall be furnished as a coordinated factory assembly by or through a single pump manufacturer.

−

−### The manufacturer shall be responsible for hydraulic performance, mechanical integrity, and dimensional coordination of the assembly.

−

−### Field assembly of pump and motor from independent suppliers is not acceptable for base-mounted pumps and not preferred for any application; where the pump and motor are not factory-assembled, the Contractor shall be solely responsible for alignment, baseplate flatness, and coupling selection without recourse to the pump manufacturer.

−

−## Hydraulic Institute Compliance {toc}

−

−```datasheet

−label: Hydraulic Institute Certification Level

−type: radio

−options:

− - "Certified performance curve (manufacturer's standard, no witness)"

− - "Certified hydrostatic test only"

− - "Witness performance test per HI 14.6 Grade 1B (one duty point)"

− - "Witness performance test per HI 14.6 Grade 1U (multiple duty points)"

−default: "Certified performance curve (manufacturer's standard, no witness)"

−```

−

−### Pumps shall be designed, rated, and tested in accordance with applicable Hydraulic Institute (HI) standards.

−

−### Manufacturer's published performance curves shall reflect testing per ANSI/HI 14.6 and shall include the published tolerances on flow, head, and efficiency.

−

−### Selection within the Allowable Operating Region (AOR) defined by ANSI/HI 9.6.3 shall be verified for each pump tag.

−

−### Where witnessed testing is specified, the Contractor shall provide a minimum of three weeks advance notice and document the duty points to be verified.

−

−### Witness performance testing is reserved for large pumps (typically 100 HP and above), critical applications (hospitals, data centers, district energy plants), and pumps where the head-capacity envelope is unusually tight. {note}

−

−### For most commercial HVAC pumps below 75 HP, the manufacturer's certified curve based on production sampling and individual hydrostatic testing is sufficient. {note}

−

−## NRTL Listing {toc}

−

−### The complete pump-motor assembly, including any integral electrical components (motor leads, junction boxes, integral VFDs, integral starters), shall be listed and labeled by a Nationally Recognized Testing Laboratory (NRTL) where required by the AHJ.

−

−### Integral motor starters or VFDs shall additionally bear the listing applicable to that device.

−

−## Installer Qualifications {toc}

−

−### Field installation, coupling alignment, and startup of base-mounted pumps shall be performed by personnel with documented experience installing similar pumps.

−

−### Coupling alignment shall be verified by laser alignment or dial-indicator method by a qualified millwright or pump service technician; visual or "feeler gauge only" alignment of base-mounted pumps is not acceptable.

−

−### Where the pump manufacturer offers factory-trained startup service, the Contractor shall use the manufacturer's startup technician for the initial commissioning of pumps 50 HP and above.

−

−## Pre-Installation Conference {toc}

−

−### A pre-installation conference shall be held before pump installation begins, attended by the mechanical contractor, the controls contractor, the TAB agent, the pump manufacturer's representative, and the Owner's representative.

−

−### The agenda shall include pump rigging and setting sequence, baseplate grouting procedure, suction piping straight-run verification, coupling alignment requirements, startup sequence, and the schedule for measuring system flow against the pump curve.

−

−# Environmental and Service Conditions {toc}

−

−## Service Categories {toc}

−

−### Pumps are selected by service category. {note}

−### The hydraulic and mechanical requirements differ significantly among HVAC services because of differences in operating temperature, water chemistry, and the consequences of failure. {note}

−

−### The service for each pump shall be specified so its hydraulic and mechanical requirements match the operating temperature, water chemistry, and consequences of failure for that service.

−

−```datasheet

−label: Pump Service

−type: select

−options:

− - "Heating hot water (HHW) — closed loop, up to 250°F"

− - "Chilled water (CHW) — closed loop, 36–55°F supply"

− - "Condenser water (CW) — open loop, cooling tower service"

− - "Glycol solution — closed loop with propylene or ethylene glycol"

− - "Domestic preheat / water source heat pump loop — closed loop, 60–90°F"

−default: "Chilled water (CHW) — closed loop, 36–55°F supply"

−```

−

−### Closed-loop HHW and CHW pumps see relatively clean treated water and a long service life with seal replacement every 5–7 years; open-loop condenser water pumps see suspended solids and biological growth that accelerate wear and require more conservative material selection; glycol is more viscous at low temperatures, reduces efficiency proportionally, and requires confirmed elastomer compatibility for the glycol type and concentration. {note}

−

−## Operating Temperature Range {toc}

−

−```datasheet

−label: Pumped Fluid Maximum Operating Temperature

−type: range

−unit: °F

−drawing_ref: true

−options:

− min: 40

− max: 250

− setpoints: [40, 55, 65, 85, 95, 140, 180, 200, 220, 250]

−default: 180

−```

−

−```datasheet

−label: Pumped Fluid Minimum Operating Temperature

−type: range

−unit: °F

−drawing_ref: true

−options:

− min: 32

− max: 180

− setpoints: [32, 36, 40, 45, 65, 100, 180]

−default: 40

−```

−

−### HHW pumps operating up to 250°F require Class 250 cast iron flanges or steel flanges; standard Class 125 cast iron flanges are not rated for HHW supply temperatures above approximately 200°F at any significant pressure.

−

−### The Contractor shall confirm that the pump casing rating matches the contract drawing's stated maximum operating pressure and temperature combination.

−

−### Operating temperature determines casing pressure class, gasket and elastomer selection, and mechanical seal selection. {note}

−

−## Ambient Conditions and Location {toc}

−

−```datasheet

−label: Pump Installation Location

−type: select

−options:

− - "Indoor — conditioned mechanical room"

− - "Indoor — unconditioned mechanical room or penthouse"

− - "Outdoor — covered, weather-protected enclosure"

− - "Outdoor — exposed (weatherproof motor required)"

− - "Vertical turbine — submerged in cooling tower sump"

−default: "Indoor — conditioned mechanical room"

−```

−

−### Pumps installed in unconditioned penthouses or outdoor locations shall be provided with weatherproof motor enclosures, drain provisions for casing condensation in chilled water service, and freeze protection of the pumped fluid and any stagnant water column.

−

−### Vertical turbine pumps installed in cooling tower sumps require careful selection of motor enclosure (typically WP-I weather-protected or TEFC) and adequate above-water clearance for motor and discharge head; the motor shall not be exposed to splash from the tower fill.

−

−### Indoor pumps in conditioned mechanical rooms are the standard commercial application and require no special environmental measures. {note}

−

−## Altitude and Atmospheric Pressure {toc}

−

−```datasheet

−label: Installation Altitude

−type: select

−options:

− - "Below 3,300 ft (1,000 m) — standard NPSHa calculation"

− - "3,300–6,600 ft (1,000–2,000 m) — atmospheric pressure correction required for NPSHa"

− - "Above 6,600 ft (2,000 m) — significant NPSHa derating; verify pump suitability"

−default: "Below 3,300 ft (1,000 m) — standard NPSHa calculation"

−```

−

−### The NPSHa calculation shall use the actual site atmospheric pressure, not sea-level pressure.

−

−### Motor selection shall be verified with the manufacturer for altitudes above 3,300 ft, where motors derate due to reduced convective cooling.

−

−### Available NPSH depends on atmospheric pressure at the installation elevation: at sea level atmospheric pressure contributes approximately 33.9 ft of water column to NPSHa for an open system, while at 5,000 ft elevation the contribution drops to approximately 27.8 ft — a reduction of 6 ft that can eliminate the NPSH margin on a marginal selection. {note}

−

−# Pump Configurations {toc}

−

−## Configuration Selection {toc}

−

−### The pump configuration is selected based on flow, head, available space, redundancy requirements, and the suction approach. {note}

−

−### The pump configuration shall be specified for each pump based on its required flow, head, available space, redundancy, and suction approach.

−

−```datasheet

−label: Pump Configuration

−type: select

−options:

− - "End-suction, long-coupled (frame-mounted, separate motor and pump on baseplate)"

− - "End-suction, close-coupled (motor shaft directly drives impeller — compact)"

− - "In-line, close-coupled (vertical or horizontal — drop-in piping replacement)"

− - "In-line, split-coupled (vertical with separate motor and pump shaft, coupling between)"

− - "Horizontal split-case, base-mounted (double-suction impeller, large flow applications)"

− - "Vertical multi-stage in-line (high head, moderate flow)"

− - "Vertical turbine (line-shaft, for cooling tower sump or wet well service)"

−default: "End-suction, long-coupled (frame-mounted, separate motor and pump on baseplate)"

−```

−

−### Selections outside the typical application range are permitted only where there is a specific technical reason and the Engineer of Record confirms suitability.

−

−### End-suction long-coupled pumps are the workhorse of commercial HVAC (approximately 100 GPM to 3,000 GPM); close-coupled end-suction pumps cut first cost but require motor removal for impeller service; in-line pumps suit moderate flows where floor space is limited; horizontal split-case double-suction pumps suit large flows (typically above 1,500 GPM) with a flatter efficiency curve; vertical multi-stage in-line pumps generate high head (200 ft and above) at moderate flow; and vertical turbine pumps serve condenser water when the suction connection is below the cooling tower sump water level, eliminating the priming problem and the long suction piping NPSH penalty. {note}

−

−## Number of Pumps and Redundancy {toc}

−

−### Typical arrangements include lead-lag pairs (one duty, one standby), parallel duty-and-standby (two pumps at 100% capacity each, alternating duty), parallel pairs (two pumps at 50% capacity each, both running at design load), and variable-speed sets of three or more pumps for variable-flow distribution systems. {note}

−

−### Pump count and redundancy arrangement shall be [[drawing: as indicated on the mechanical equipment schedules and piping diagrams]].

−

−```datasheet

−label: Pump Arrangement

−type: select

−options:

− - "Single pump (no redundancy)"

− - "Duty and standby (2 × 100% capacity, alternating)"

− - "Parallel duty (2 × 50% capacity, both running at design load)"

− - "Parallel duty with standby (3 × 50%, 2 duty + 1 standby)"

− - "Variable-speed parallel set (3 or more pumps, staged by flow demand)"

− - "Series — primary/secondary or low-load boost"

−drawing_ref: true

−default: "Duty and standby (2 × 100% capacity, alternating)"

−```

−

−# Performance Requirements {toc}

−

−## Design Flow and Head {toc}

−

−```datasheet

−label: Design Flow

−type: range

−unit: GPM

−drawing_ref: true

−options:

− min: 10

− max: 10000

− setpoints: [10, 25, 50, 75, 100, 150, 200, 300, 400, 500, 750, 1000, 1500, 2000, 3000, 5000, 7500, 10000]

−default: 500

−```

−

−```datasheet

−label: Design Total Dynamic Head

−type: range

−unit: ft

−drawing_ref: true

−options:

− min: 10

− max: 500

− setpoints: [10, 20, 30, 40, 50, 60, 75, 90, 100, 125, 150, 200, 250, 300, 400, 500]

−default: 75

−```

−

−### Each pump shall be selected and certified for the design flow and head [[drawing: as indicated on the mechanical equipment schedules]].

−

−### Pump selection shall place the design operating point within the Allowable Operating Region (AOR) defined by ANSI/HI 9.6.3, and preferably within the Preferred Operating Region (POR) of 70% to 120% of best efficiency point (BEP) flow.

−

−### Pumps that operate continuously near or below the minimum continuous stable flow shall be furnished with a minimum-flow bypass (typically a continuous bypass around the pump back to the suction header) to maintain flow through the pump during low-load conditions.

−

−### Selecting a pump too far to the left of BEP (below 70% of BEP flow) causes low efficiency and seal and bearing service-life problems from recirculation within the impeller, while selecting too far to the right (above 120% of BEP) causes high radial loads, reduced bearing life, and frequently inadequate NPSH margin. {note}

−

−## Efficiency at Design Operating Point {toc}

−

−```datasheet

−label: Pump Efficiency at Design Operating Point (Minimum)

−type: range

−unit: '%'

−options:

− min: 50

− max: 90

− setpoints: [50, 55, 60, 65, 70, 72, 75, 78, 80, 82, 85, 88, 90]

−default: 75

−```

−

−### Pump efficiency at the design operating point shall meet the minimum value shown for the selected pump configuration.

−

−### For variable-speed pumping systems, the Engineer shall review the operating profile and weighted-average part-load efficiency for systems that operate predominantly at part load.

−

−### Typical achievable efficiencies vary by configuration — end-suction single-stage pumps achieve 70% to 82% at BEP, horizontal split-case double-suction pumps 80% to 87%, and vertical turbine pumps 75% to 82% in HVAC sizes; a design-point efficiency well below the published BEP value indicates the operating point is far from BEP, and for variable-speed systems efficiency at part-load conditions matters more than peak efficiency. {note}

−

−## ASHRAE 90.1 Energy Compliance {toc}

−

−```datasheet

−label: ASHRAE 90.1 Variable Speed Control Required

−type: radio

−options:

− - "Required — pump motor exceeds ASHRAE 90.1 threshold"

− - "Required — by Owner request regardless of threshold"

− - "Not required — pump motor below threshold and constant flow acceptable"

−default: "Required — pump motor exceeds ASHRAE 90.1 threshold"

−```

−

−### Pump system motor power shall comply with ANSI/ASHRAE/IES 90.1 where applicable.

−

−### For pump systems with motor nameplate horsepower exceeding the threshold defined in ASHRAE 90.1 Section 6.5.4, variable-speed control shall be provided.

−

−### Variable-speed pumping shall comply with [[sync/hvac-variable-frequency-drives]] for the motor drive.

−

−### Variable-speed pumping in closed-loop hydronic systems substantially reduces pumping energy at the part-load conditions that dominate annual operation: a chilled water distribution pump operating at 60% flow consumes approximately 22% of full-speed power under affinity-law operation, compared to over 90% of full-speed power if the same pump is throttled with a control valve. {note}

−

−## Net Positive Suction Head (NPSH) {toc}

−

−```datasheet

−label: NPSH Required (NPSHr) at Design Operating Point

−type: range

−unit: ft

−options:

− min: 2

− max: 40

− setpoints: [2, 4, 6, 8, 10, 12, 15, 20, 25, 30, 40]

−default: 10

−```

−

−```datasheet

−label: NPSH Margin per HI 9.6.1 (Verified by Engineer)

−type: radio

−options:

− - "Verified — NPSHa exceeds 1.35 × NPSHr or NPSHr + 5 ft per HI 9.6.1"

− - "Marginal — within 1.2× NPSHr; selection accepted on engineer's judgment"

− - "Pending — calculation not yet complete"

−default: "Verified — NPSHa exceeds 1.35 × NPSHr or NPSHr + 5 ft per HI 9.6.1"

−```

−

−### The Engineer of Record shall calculate the NPSH available (NPSHa) at the pump suction at the design operating point and at runout, accounting for atmospheric pressure (corrected for altitude), static suction lift or head, suction piping friction loss, and the vapor pressure of the pumped fluid at the maximum operating temperature.

−

−### The NPSH margin (NPSHa − NPSHr) shall comply with ANSI/HI 9.6.1; the minimum margin is 1.35 × NPSHr or NPSHr + 5 ft, whichever is greater, for pumps in continuous duty, with the absolute 5 ft margin governing for pumps with NPSHr below approximately 10 ft.

−

−### Suction piping shall provide a minimum of five pipe diameters of straight pipe immediately upstream of the pump suction flange, or equivalent flow-conditioning device (suction diffuser, flow straightener).

−

−### Where the available space prevents the straight-run requirement, the pump manufacturer shall confirm that the alternate arrangement is acceptable.

−

−### NPSHr is the suction-side absolute pressure margin above the vapor pressure that the pump requires to operate without cavitation; marginal margin causes intermittent cavitation that damages impeller leading edges, increases noise and vibration, and shortens seal life, and this damage progresses silently and often goes undetected until the impeller is removed for unrelated service, while for pumps drawing from a cooling tower sump a single elbow close to the suction can reduce effective NPSHa by 1 to 2 ft and induce shaft vibration. {note}

−

−## Variable-Frequency Operation {toc}

−

−### For variable-speed pumps, the pump shall be stable and free of resonant vibration across the operating speed range from the configured minimum speed to design speed.

−

−### The drive shall be programmed with skip-frequency bands as needed to avoid resonance, identified during commissioning.

−

−### The drive minimum speed shall be set during commissioning, recognizing that operation below approximately 25% of rated speed is generally not productive; refer to [[sync/hvac-variable-frequency-drives]] for drive minimum speed configuration.

−

−### Operation below approximately 25% of rated speed develops insufficient head to overcome static head and minimum system resistance, and the pump operates below its minimum continuous stable flow. {note}

−

−## Rotative Speed {toc}

−

−```datasheet

−label: Nominal Rotative Speed

−type: radio

−unit: RPM

−options:

− - "1750 RPM (4-pole motor, 60 Hz) — standard for HVAC pumps"

− - "3500 RPM (2-pole motor, 60 Hz) — high-head, compact applications"

− - "1150 RPM (6-pole motor, 60 Hz) — large pumps, lower noise"

− - "Variable (VFD-driven, base speed per motor)"

−default: "1750 RPM (4-pole motor, 60 Hz) — standard for HVAC pumps"

−```

−

−### 3500 RPM service shall not be specified for large pumps in continuous service without a specific design reason.

−

−### 1750 RPM is the standard speed for HVAC pumps because it best balances pump size, efficiency, NPSH characteristics, bearing life, and seal life; 3500 RPM pumps are smaller and cheaper for a given duty but the higher impeller tip speed approximately doubles NPSHr, accelerates seal face wear, halves bearing life, and produces more noise, and is appropriate only for high-head low-flow vertical multi-stage pumps and small in-line pumps. {note}

−

−# Materials of Construction {toc}

−

−## General Material Selection {toc}

−

−### Materials of construction shall be selected based on service category and water chemistry.

−

−### Open-loop condenser water service, aggressive water (low pH, high chloride), and glycol service shall use upgraded materials documented in the selection.

−

−### The default materials specified in this section are appropriate for clean closed-loop hydronic service with conventional chemical treatment. {note}

−

−## Casing Material {toc}

−

−```datasheet

−label: Casing Material

−type: select

−options:

− - "Cast iron (ASTM A48 Class 30 minimum) — standard closed-loop service"

− - "Ductile iron (ASTM A536) — higher pressure or where impact resistance is needed"

− - "Bronze (ASTM B584 C90500 or equivalent) — domestic preheat or aggressive open-loop"

− - "Carbon steel — high-temperature HHW above 250°F or high-pressure applications"

− - "Stainless steel (Type 316) — process or aggressive chemistry applications"

−default: "Cast iron (ASTM A48 Class 30 minimum) — standard closed-loop service"

−```

−

−### Cast iron pumps shall not be used where the pump may be left dry or partially drained for extended periods, because atmospheric oxygen accelerates rust formation on dry interior surfaces and the resulting scale damages mechanical seal faces on restart.

−

−### Cast iron is the standard casing material for closed-loop HHW, CHW, and well-treated CW service because it develops a stable passive oxide layer in treated water; bronze and stainless steel casings are appropriate where the water chemistry is aggressive (high chloride coastal open-loop service, recovered greywater, geothermal source loops), where copper-alloy contact is needed for compatibility with copper piping, or where corrosion margin is required to extend service intervals. {note}

−

−## Impeller Material {toc}

−

−```datasheet

−label: Impeller Material

−type: select

−options:

− - "Bronze (ASTM B584) — standard for HVAC service"

− - "Cast iron — economical alternative for closed-loop only, requires treated water"

− - "Stainless steel (Type 316) — aggressive water chemistry"

− - "Stainless steel (Duplex 2205) — severe service"

−default: "Bronze (ASTM B584) — standard for HVAC service"

−```

−

−### Stainless steel impellers shall be specified for raw water sources, seawater-affected installations, and applications with documented water chemistry concerns.

−

−### Bronze impellers are the standard for HVAC service because of excellent corrosion resistance, dimensional stability, and resistance to galvanic interaction with the cast iron casing; cast iron impellers serve as an economical alternative in treated closed-loop service but experience accelerated wear at the leading edge and around wear rings in open-loop or aggressive service. {note}

−

−## Shaft Material and Sleeves {toc}

−

−```datasheet

−label: Shaft Material

−type: radio

−options:

− - "Carbon steel (AISI 1045 or equivalent) with bronze or stainless steel shaft sleeve"

− - "Stainless steel (Type 316 or 17-4PH) — direct seal contact, no sleeve"

−default: "Carbon steel (AISI 1045 or equivalent) with bronze or stainless steel shaft sleeve"

−```

−

−### The shaft is the most highly stressed component of the pump under combined torque, bending, and thrust loading; carbon steel shafts with replaceable shaft sleeves at the seal area are the standard arrangement, while stainless steel shafts allow direct seal contact and eliminate the sleeve at greater cost {note}

−

−## Wear Rings {toc}

−

−```datasheet

−label: Wear Rings

−type: radio

−options:

− - "Renewable bronze wear rings on impeller and casing (standard)"

− - "Renewable stainless steel wear rings"

− - "Not required — impeller direct to casing (small pumps below 25 HP)"

−default: "Renewable bronze wear rings on impeller and casing (standard)"

−```

−

−### Wear rings (renewable close-clearance rings between the impeller and casing that limit internal recirculation from the discharge eye back to the suction) shall be provided on all pumps 25 HP and above.

−

−### Wear rings shall be bronze for cast iron and bronze impeller combinations, or stainless steel for stainless steel impellers.

−

−### Renewable wear rings allow restoration of original efficiency at the next overhaul without replacing the impeller or casing, as efficiency declines progressively when wear rings wear over service life. {note}

−

−# Mechanical Seal {toc}

−

−## Mechanical Seal Type {toc}

−

−```datasheet

−label: Mechanical Seal Type

−type: select

−options:

− - "Single inside seal, balanced — standard HVAC service"

− - "Single inside seal, unbalanced — low pressure applications below 75 psig"

− - "Single cartridge seal — pre-set cartridge for ease of installation and replacement"

− - "Double seal (back-to-back) with seal flush — high-temperature or contaminated service"

− - "Tandem seal with buffer fluid — leak containment for hazardous service (rare in HVAC)"

−default: "Single cartridge seal — pre-set cartridge for ease of installation and replacement"

−```

−

−### Mechanical seals shall be the pump shaft sealing method for HVAC service; packing-type stuffing boxes shall not be used for new HVAC pumps under this standard except in vertical turbine pumps with line shaft packing, which is addressed separately.

−

−### Cartridge-type mechanical seals are strongly preferred over component-style seals because the cartridge is pre-assembled, pre-set, and tested at the seal manufacturer's facility and field installation requires only mounting and tightening setscrews, whereas component seals require precise field-set of the spring compression — a skill-dependent operation often performed incorrectly — and the added cost of a cartridge seal is recovered on the first replacement cycle. {note}

−

−## Seal Face Materials {toc}

−

−```datasheet

−label: Mechanical Seal Face Combination

−type: select

−options:

− - "Carbon vs. ceramic (alumina) — standard closed-loop service"

− - "Carbon vs. silicon carbide — extended life, abrasive-tolerant"

− - "Silicon carbide vs. silicon carbide — open-loop CW with high suspended solids"

− - "Tungsten carbide vs. tungsten carbide — heavy-duty industrial service"

−default: "Carbon vs. silicon carbide — extended life, abrasive-tolerant"

−```

−

−### Silicon-carbide-versus-silicon-carbide faces shall be required for open-loop condenser water service where the seal will see suspended solids from the cooling tower, and for any installation retrofitted into existing piping without thorough flushing.

−

−### Carbon-versus-ceramic is the historical standard and is appropriate for clean closed-loop service, but the carbon face wears faster than silicon carbide under any condition that brings particulate into the seal chamber, so carbon-versus-silicon carbide — which provides substantially longer service life at modest added cost — is recommended for new installations as the default. {note}

−

−## Seal Elastomers {toc}

−

−```datasheet

−label: Seal Elastomer

−type: radio

−options:

− - "EPDM — water service up to 230°F, glycol compatible"

− - "Viton (FKM) — high temperature, chemical resistance"

− - "Aflas — high temperature with strong oxidizers"

−default: "EPDM — water service up to 230°F, glycol compatible"

−```

−

−### Viton (FKM) shall be used for elevated temperatures above approximately 230°F or where the system contains aromatic chemicals, petroleum products, or strong oxidizers.

−

−### Where the system contains chlorinated treatment chemicals at concentrations above standard maintenance levels (system shock-treatments, decontamination procedures), elastomer compatibility shall be confirmed with the chemical supplier and the seal manufacturer.

−

−### EPDM is the standard elastomer for HVAC water and glycol service. {note}

−

−## Seal Flush Plan {toc}

−

−```datasheet

−label: Seal Flush Arrangement

−type: select

−options:

− - "Internal flush from discharge (closed-loop water, clean service)"

− - "External flush from clean source (open-loop CW or solids-bearing service)"

− - "Cyclone separator at seal chamber (open-loop CW alternative)"

− - "Quench with external clean water (high-temperature service)"

−default: "Internal flush from discharge (closed-loop water, clean service)"

−```

−

−### For pumps in clean closed-loop service, an internal seal flush from the discharge side of the casing (API Plan 11 equivalent) shall provide positive flow across the seal faces and cool the seal chamber.

−

−### For open-loop condenser water service or any application with suspended solids, an external flush from a clean source (API Plan 32 equivalent) or a seal-chamber cyclone separator (API Plan 31 equivalent) shall be specified to prevent solids from accumulating between the seal faces.

−

−# Motor {toc}

−

−## Motor Type and Construction {toc}

−

−```datasheet

−label: Motor Enclosure

−type: select

−options:

− - "Totally Enclosed Fan Cooled (TEFC) — standard for mechanical rooms"

− - "Open Drip Proof (ODP) — indoor conditioned spaces only"

− - "Totally Enclosed Air Over (TEAO) — close-coupled pump applications"

− - "Totally Enclosed Non-Ventilated (TENV) — small motors below 5 HP"

− - "Weather Protected Type I (WP-I) — outdoor cooling tower applications"

− - "Explosion-proof — hazardous (classified) locations"

−default: "Totally Enclosed Fan Cooled (TEFC) — standard for mechanical rooms"

−```

−

−### Pump motors shall be premium-efficiency three-phase induction motors meeting NEMA MG 1.

−

−### Motors shall be inverter-duty rated per NEMA MG 1 Part 31 for any pump connected to a variable frequency drive.

−

−### Non-inverter-duty motors shall not be connected to VFDs without an output filter sized per [[sync/hvac-variable-frequency-drives]].

−

−### ODP motors shall not be specified for spaces where airborne moisture, dust, or chemical contaminants may be present.

−

−### WP-I (weather protected, type I) motors shall be used for outdoor cooling tower pump applications where the motor is above the deck but exposed to weather.

−

−### Explosion-proof motors shall be used only where the pump is installed in a classified location per NFPA 70 Article 500.

−

−### TEFC is the standard motor enclosure for HVAC pump service; ODP motors are acceptable only in clean conditioned mechanical rooms. {note}

−

−## Motor Efficiency {toc}

−

−```datasheet

−label: Motor Efficiency Class

−type: radio

−options:

− - "NEMA Premium / IE3 (standard for new installations)"

− - "IE4 Super-Premium (where lifecycle energy cost justifies upgrade)"

− - "Standard efficiency (not recommended for new construction)"

−default: "NEMA Premium / IE3 (standard for new installations)"

−```

−

−### NEMA Premium (IE3) efficiency shall be the minimum for new construction under U.S. Department of Energy regulations and ASHRAE 90.1.

−

−### IE4 Super-Premium motors provide an additional 1% to 3% efficiency improvement at full load and are most beneficial for motors that operate continuously at high load (large primary chilled water pumps, condenser water pumps, district energy plants); for pumps that operate intermittently or at part load, the IE4-over-IE3 advantage is less significant than the gain from variable-speed operation itself. {note}

−

−## Motor Horsepower {toc}

−

−```datasheet

−label: Motor Horsepower

−type: range

−unit: HP

−drawing_ref: true

−options:

− min: 0.5

− max: 500

− setpoints: [0.5, 0.75, 1, 1.5, 2, 3, 5, 7.5, 10, 15, 20, 25, 30, 40, 50, 60, 75, 100, 125, 150, 200, 250, 300, 350, 400, 500]

−default: 15

−```

−

−```datasheet

−label: Motor Service Factor

−type: radio

−options:

− - "1.15 (NEMA standard for premium efficiency motors)"

− - "1.0 (inverter-duty motors operated continuously on VFD)"

−default: "1.15 (NEMA standard for premium efficiency motors)"

−```

−

−### Motor horsepower shall be selected to be non-overloading throughout the pump's full operating range from shutoff to runout.

−

−### The brake horsepower (BHP) at any point on the pump curve, including runout (the maximum flow at minimum head), shall not exceed the motor nameplate horsepower times the service factor.

−

−### VFD-driven motors shall be selected so that the operating amperage at the design condition is at or below the motor nameplate full-load amperage (1.0 service factor).

−

−### Non-overloading selection is the standard requirement for pumps with rising BHP curves; for pumps with flat or drooping BHP characteristics, the selection criterion shifts to the BHP at the design operating point with appropriate safety margin. {note}

−

−### Service factor on VFD-fed motors is not a reliable basis for continuous overload operation, because the VFD waveform increases motor heating compared to sinusoidal supply and reduces motor life. {note}

−

−## Motor Voltage {toc}

−

−```datasheet

−label: Motor Voltage

−type: select

−options:

− - "208V / 3-phase (small motors only)"

− - "230V / 3-phase"

− - "460V / 3-phase"

− - "480V / 3-phase"

− - "575V / 3-phase"

− - "115V / 1-phase (small pumps below 1 HP)"

− - "230V / 1-phase (small pumps below 2 HP)"

−default: "460V / 3-phase"

−```

−

−### Three-phase motors shall be used for all pumps 1 HP and above; single-phase motors are acceptable only for small in-line pumps and circulators below 1 HP where three-phase power is not available at the pump location.

−

−### Motor voltage shall match the building electrical service available at the pump connection point.

−

−### For large pumps (50 HP and above), 460V or 480V three-phase service shall be the standard.

−

−# Baseplates, Coupling, and Vibration Isolation {toc}

−

−## Baseplate for Base-Mounted Pumps {toc}

−

−```datasheet

−label: Baseplate Type

−type: select

−options:

− - "Standard fabricated steel baseplate, factory-furnished"

− - "Rigid heavy-duty steel baseplate with grout dam"

− - "Stress-relieved baseplate with machined mounting pads"

− - "Polymer concrete baseplate (corrosion-resistant)"

− - "Not applicable — close-coupled or in-line pump"

−default: "Rigid heavy-duty steel baseplate with grout dam"

−```

−

−```datasheet

−label: Baseplate Grouting

−type: radio

−options:

− - "Non-shrink cementitious grout (standard)"

− - "Epoxy grout (high vibration, corrosive environments)"

− - "Not applicable — pump on vibration isolators with no grouted base"

−default: "Non-shrink cementitious grout (standard)"

−```

−

−### The baseplate shall be sufficiently stiff to prevent flexure under operating loads.

−

−### For pumps 25 HP and above, a rigid heavy-duty baseplate with grout dam and machined motor-mounting pads shall be required.

−

−### Baseplates shall be installed on a properly prepared housekeeping pad and grouted in place with non-shrink grout per the pump manufacturer's installation instructions.

−

−### The grouting procedure shall include leveling the baseplate before grouting, removing all rust and contamination from the underside of the baseplate, and venting the grout placement to prevent voids.

−

−### A flexible baseplate allows the motor to move relative to the pump as the system warms up, breaking alignment; voids beneath the baseplate cause local flexure and are a common source of pump vibration mistakenly diagnosed as a pump problem. {note}

−

−## Coupling {toc}

−

−```datasheet

−label: Coupling Type

−type: select

−options:

− - "Flexible elastomeric jaw coupling (standard for HVAC pumps)"

− - "Flexible disc coupling (no elastomer wear, longer service life)"

− - "Gear coupling (high-torque applications above 100 HP)"

− - "Direct shaft (close-coupled, no separate coupling)"

−default: "Flexible elastomeric jaw coupling (standard for HVAC pumps)"

−```

−

−### A factory-furnished coupling guard meeting OSHA 29 CFR 1910.219 shall be provided.

−

−### The guard shall be removable without disturbing the pump-motor alignment to allow inspection and replacement of the coupling element.

−

−### Flexible couplings accommodate small misalignments and absorb torque pulsations; elastomeric jaw couplings are the most common type, with the elastomer spider as the wear component requiring periodic inspection, while flexible disc couplings use a stack of thin metal discs to eliminate elastomer wear and — at higher first cost but very long service life — are recommended for critical applications and motors above 50 HP. {note}

−

−## Vibration Isolation {toc}

−

−```datasheet

−label: Vibration Isolation

−type: select

−options:

− - "Spring isolators with seismic restraint (base-mounted pumps in occupied buildings)"

− - "Inertia base with spring isolators (heavy pumps and high vibration applications)"

− - "Elastomeric (rubber) isolators (small pumps below 5 HP)"

− - "Direct-mount on housekeeping pad (vertical in-line pumps with no isolation requirement)"

− - "Not required — pump on grade slab isolated from building"

−default: "Spring isolators with seismic restraint (base-mounted pumps in occupied buildings)"

−```

−

−### Base-mounted pumps installed on a floor slab in an occupied building shall be vibration-isolated to prevent transmission of pump vibration to the structure.

−

−### Spring isolators shall be selected for a minimum static deflection of 1 inch (for 1750 RPM pumps) or 0.5 inch (for 3500 RPM pumps).

−

−### Heavier pumps and pumps adjacent to acoustically sensitive spaces (executive offices, conference rooms, recording or testing spaces) shall be mounted on an inertia base — a concrete-filled steel frame that adds mass to lower the natural frequency of the isolated system.

−

−### Vertical in-line pumps mounted in the piping line are supported by the piping and require no separate vibration isolation; however, the connected piping shall include pipe supports adjacent to the pump that allow the pump weight to be carried by the supports rather than as cantilever load on the suction and discharge runs.

−

−### See [[sync/hydronic-piping]] for pump connection details. {note}

−

−## Flexible Connectors and Pipe Supports {toc}

−

−### Flexible pipe connectors shall be provided at the pump suction and discharge connections to accommodate small misalignments, absorb pipe-side vibration, and accommodate thermal pipe movement.

−

−### The connectors shall be sized for the full system operating pressure and the maximum operating temperature; refer to [[sync/hydronic-piping]] for flexible connector requirements and pipe support details adjacent to pumps.

−

−## Seismic Restraint {toc}

−

−```datasheet

−label: Seismic Restraint Required

−type: radio

−options:

− - "Yes — per IBC and ASCE 7 (verify project seismic design category)"

− - "Yes — required for essential facility (Ip = 1.5)"

− - "No"

−default: "No"

−```

−

−### Where required by the IBC and ASCE 7 based on the seismic design category and the equipment importance factor, pumps shall be provided with seismic restraints.

−

−### Restraints shall be designed to permit the vibration isolators to function normally during routine operation while limiting motion during a seismic event to a level that does not damage attached piping, electrical connections, or the pump and motor.

−

−# Controls and Electrical {toc}

−

−## Motor Controls {toc}

−

−```datasheet

−label: Motor Control Method

−type: select

−options:

− - "Variable frequency drive (VFD) — variable-speed pump control"

− - "Soft starter — reduced inrush, constant speed"

− - "Across-the-line magnetic starter — constant speed, standard"

− - "Reduced-voltage starter (auto-transformer or wye-delta) — large motors with starting limitations"

−default: "Variable frequency drive (VFD) — variable-speed pump control"

−```

−

−### Pump motor control shall be furnished as scheduled on the contract drawings.

−

−### For variable-speed pumps, the variable frequency drive shall conform to [[sync/hvac-variable-frequency-drives]].

−

−### For constant-speed pumps, a motor starter shall be provided as part of the motor control center or as a local combination starter.

−

−### VFDs for pump motors shall conform to [[sync/hvac-variable-frequency-drives]] including the cable length and output filter requirements that protect the pump motor.

−

−### Reduced-voltage starters shall be used for large motors only where the electrical service limits across-the-line starting inrush.

−

−### VFDs are preferred for new pump installations 5 HP and above for the part-load energy savings, reduced starting inrush, and the ability to slow the pump for commissioning and adjust the operating point in service, while across-the-line starters with conventional thermal-magnetic overload protection are acceptable for small constant-speed pumps where VFD energy savings do not justify the added cost. {note}

−

−## Suction and Discharge Pressure Gauges {toc}

−

−```datasheet

−label: Pump Pressure Gauges

−type: radio

−options:

− - "Suction compound gauge and discharge pressure gauge (standard)"

− - "Combined differential pressure gauge across pump"

− - "Pressure transmitters (4–20 mA) to BAS, no local gauges"

− - "Both local gauges and BAS-monitored transmitters"

−default: "Suction compound gauge and discharge pressure gauge (standard)"

−```

−

−### A pressure gauge shall be provided on both the suction and the discharge of each pump.

−

−### Gauges shall be liquid-filled glycerin or silicone type for vibration damping.

−

−### Gauge scale shall be selected so that the design operating pressure falls in the middle third of the scale.

−

−### Suction and discharge gauges are essential maintenance tools; the differential between them is the actual operating head, and comparing measured differential against the pump curve at the measured flow is the primary field diagnostic for pump performance. {note}

−

−## Status and Alarm Points {toc}

−

−```datasheet

−label: Pump-Specific BAS Points

−type: checkbox

−options:

− - "Pump run status (proof of flow, via differential pressure switch or flow switch)"

− - "Discharge pressure (transmitter, 4–20 mA)"

− - "Suction pressure (transmitter, 4–20 mA)"

− - "Pump differential pressure (calculated or differential transmitter)"

− - "Flow (where flow meter installed)"

− - "Seal leak detection (where seal leak collection is provided)"

− - "Bearing temperature (large pumps 50 HP and above)"

− - "Lead/lag selection and rotation"

−default: "Pump run status (proof of flow, via differential pressure switch or flow switch)"

−```

−

−### Pump status and alarm conditions shall be reported to the building automation system per [[sync/building-automation-system]].

−

−### Where the pump is controlled by a VFD, the BAS points listed in [[sync/hvac-variable-frequency-drives]] cover most pump monitoring requirements; the additional pump-specific points listed in the datasheet above shall be added.

−

−### Proof-of-flow status is more reliable than a current switch on the motor leads, because a pump can be electrically running but hydraulically deadheaded while a current switch shows the motor running with no flow delivered. {note}

−

−# Testing {toc}

−

−## Factory Tests {toc}

−

−### The manufacturer shall perform the following factory tests on each pump — hydrostatic, visual and dimensional inspection, mechanical run, and (where specified) witnessed performance testing:

−

−- Hydrostatic test of the assembled pump casing at 150% of maximum allowable working pressure or per ANSI/HI 14.6 test requirements, with no leakage from castings or joints

−- Visual and dimensional inspection of casing, impeller, shaft, and bearing components

−- Mechanical run test (operational test) of the assembled pump and motor at the factory before shipment, verifying smooth rotation, no abnormal noise, and correct rotation direction

−- Where witnessed performance testing per ANSI/HI 14.6 is specified, performance test at the design operating point and at additional duty points as specified, with reported flow, head, BHP, and efficiency

−

−```datasheet

−label: Factory Test Documentation Required

−type: checkbox

−options:

− - "Hydrostatic test certificate"

− - "Mechanical run test report"

− - "Certified performance curve based on production sampling"

− - "Witnessed performance test per HI 14.6 (where specified)"

− - "Material certificates for casing and impeller"

−default: "Hydrostatic test certificate"

−```

−

−## Field Acceptance Tests {toc}

−

−### The Contractor shall perform the field acceptance tests after installation is complete.

−

−### Pre-Startup Checks {toc}

−

−#### The Contractor shall verify pump and motor nameplate data match the equipment schedule and the design selection.

−

−#### The Contractor shall verify coupling alignment by laser or dial-indicator method and record initial cold alignment readings.

−

−#### The Contractor shall verify rotation direction by jogging the motor (uncoupled from pump or with discharge isolated) before running coupled.

−

−#### The Contractor shall verify suction piping is filled and vented and verify the discharge valve is in the correct starting position per the manufacturer's instructions (typically closed for centrifugal pumps with rising BHP curves, then opened gradually after start).

−

−#### The Contractor shall verify all instrumentation (pressure gauges, flow meter) is functional and zeroed.

−

−#### For pumps connected to VFDs, the Contractor shall verify drive parameters per [[sync/hvac-variable-frequency-drives]] field acceptance procedure.

−

−### Functional Tests {toc}

−

−#### The Contractor shall start the pump and observe for abnormal noise, vibration, or motor current.

−

−#### The Contractor shall open the discharge valve gradually while observing pump operation.

−

−#### The Contractor shall run the pump at the design point and record measured suction pressure, discharge pressure, motor amperage, and flow.

−

−#### The Contractor shall calculate actual operating head and verify against the certified pump curve at the measured flow.

−

−#### For variable-speed pumps, the Contractor shall run at minimum speed, intermediate speeds, and full speed and identify and program skip-frequency bands at any resonance points.

−

−#### The Contractor shall test all BAS points by exercising each input and observing the corresponding response.

−

−### Performance Verification {toc}

−

−```datasheet

−label: Vibration Acceptance Limits

−type: radio

−options:

− - "Per ANSI/HI 9.6.4 — pump type-specific limits"

− - "Per ANSI/HI 9.6.4 plus 25% margin for installed-condition acceptance"

− - "Manufacturer's published acceptance limits (where stricter than HI 9.6.4)"

−default: "Per ANSI/HI 9.6.4 — pump type-specific limits"

−```

−

−#### The Contractor shall coordinate with the TAB agent per [[sync/testing-adjusting-and-balancing]] to confirm system flow at the design pump operating point.

−

−#### The Contractor shall record post-thermal-growth coupling alignment after the pump has reached steady operating temperature and correct alignment if outside the manufacturer's acceptable range.

−

−#### For pumps 25 HP and above, the Contractor shall record baseline vibration measurements at the pump and motor bearings per ANSI/HI 9.6.4 at the design operating speed (and at minimum, mid-range, and design speed for variable-speed pumps).

−

−#### Vibration measurements at startup establish a baseline against which future predictive maintenance measurements can be compared. {note}

−

−## NETA Acceptance Testing for Integrated VFDs {toc}

−

−### Where the pump is provided with an integral or close-mounted VFD, the drive shall be tested per NETA ATS acceptance procedures applicable to adjustable-speed drives.

−

−### NETA testing covers insulation resistance, polarity, output frequency stability, and protective function verification; see [[sync/hvac-variable-frequency-drives]] for VFD-specific test requirements. {note}

−

−# Installation {toc}

−

−## Setting and Anchoring {toc}

−

−### Pump locations and orientations shall be [[drawing: as indicated on the mechanical equipment plans and pump piping details]].

−

−### Pumps shall be set on housekeeping pads as detailed on [[drawing: the structural and mechanical drawings]].

−

−### Pads shall extend a minimum of 4 in. beyond the baseplate footprint on all sides and shall be at least 4 in. above the surrounding floor for drainage and access.

−

−### Anchor bolts shall be set in the housekeeping pad or in the structural slab per the pump manufacturer's installation drawings.

−

−### Anchor bolt size and embedment shall be sufficient for the operating loads plus seismic loads where applicable.

−

−### Anchor bolts shall be J-bolt or post-installed wedge-anchor type as appropriate for the substrate; expansion anchors with insufficient embedment shall not be used for pumps 10 HP and above.

−

−## Coupling Alignment {toc}

−

−```datasheet

−label: Coupling Alignment Method

−type: radio

−options:

− - "Laser alignment (preferred; tolerances per manufacturer)"

− - "Dial-indicator (reverse-indicator or rim-and-face method)"

− - "Both initial laser and post-thermal-growth verification"

−default: "Both initial laser and post-thermal-growth verification"

−```

−

−### Field alignment shall be performed by a qualified millwright or pump service technician using laser alignment equipment or precision dial indicators.

−

−### Visual alignment, straight-edge methods, or feeler-gauge-only alignment shall not be used for any pump 5 HP and above.

−

−### Coupling alignment shall be performed cold (before the pump has run) and then verified hot after the pump has run long enough to reach operating temperature.

−

−### The cold alignment shall be offset to account for the expected thermal growth, and the final hot alignment shall be within the coupling manufacturer's acceptable tolerance.

−

−### Both cold and hot alignment readings shall be documented in the field startup record.

−

−### Coupling alignment is the single most consequential installation activity for base-mounted pumps; HHW pumps in particular experience significant thermal growth that changes the motor-to-pump centerline relationship as the casing warms, so cold alignment alone is insufficient. {note}

−

−## Suction Piping {toc}

−

−```datasheet

−label: Minimum Straight Pipe Upstream of Suction Flange

−type: select

−unit: pipe diameters

−options:

− - "5 pipe diameters minimum (manufacturer's standard)"

− - "10 pipe diameters (recommended for vertical turbine and large pumps)"

− - "Suction diffuser at flange (where straight run is unavailable)"

−drawing_ref: true

−default: "5 pipe diameters minimum (manufacturer's standard)"

−```

−

−### Suction piping shall provide a straight uninterrupted run of pipe immediately upstream of the pump suction flange of at least five pipe diameters, or shall include a suction diffuser, flow straightener, or other flow conditioning device approved by the pump manufacturer.

−

−### Eccentric reducers shall be used at suction-side pipe size transitions on horizontal runs, oriented flat-side-up to avoid trapping air at the high point.

−

−### Refer to [[sync/hydronic-piping]] for full pump piping requirements.

−

−### Elbows, valves, and fittings within 5 pipe diameters of the suction flange cause non-axial flow into the impeller; concentric reducers trap air at the top and are common installation errors that cause repeated pump cavitation complaints. {note}

−

−## Discharge Piping {toc}

−

−### A check valve shall be provided in the discharge piping of each pump to prevent reverse flow when the pump is off; refer to [[sync/hydronic-piping]] for check valve requirements.

−

−### An isolation valve shall be provided downstream of the check valve to permit pump removal for service.

−

−### A pressure gauge shall be installed between the check valve and the isolation valve so that the pump's actual operating discharge pressure can be read while the pump is running.

−

−## Cooling Tower Pumps and Vertical Turbines {toc}

−

−```datasheet

−label: Minimum Submergence Above Suction Bell (Vertical Turbine)

−type: range

−unit: in.

−drawing_ref: true

−options:

− min: 6

− max: 60

− setpoints: [6, 12, 18, 24, 36, 48, 60]

−default: 24

−```

−

−### Horizontal end-suction pumps drawing from a cooling tower shall have a flooded suction (the cooling tower sump water level shall be above the pump centerline); pumps that must lift water from below the tower deck shall be vertical turbine pumps, not horizontal pumps with foot valves.

−

−### Foot valves at suction for self-priming horizontal pumps shall not be acceptable for new installations.

−

−### Vertical turbine pumps installed in a cooling tower sump shall be supported from the discharge head at the sump deck.

−

−### The discharge head shall be sized for the operating thrust and weight of the column, line shaft, bowls, and impellers below.

−

−### Bowls shall be set at a depth that maintains adequate submergence at the minimum operating water level to prevent vortex formation and air entrainment.

−

−### The pump manufacturer's published minimum submergence requirement shall be confirmed against the actual cooling tower sump water level at the design flow.

−

−### Inadequate submergence causes air-entraining vortices that destroy pump performance and damage the impeller; in many cases a vortex breaker plate or flow-conditioning intake structure must be added to allow the published submergence.

−

−## Open-Loop System Legionella Risk Management {toc}

−

−### Open-loop condenser water systems shall be designed and commissioned in accordance with ASHRAE 188 building water management requirements.

−

−### The pump installation shall not create permanent low points or dead legs in the suction piping.

−

−### The Contractor shall coordinate with [[sync/hvac-water-treatment]] for the chemical and biocide treatment program for open-loop systems.

−

−### The pump installation contributes to the Legionella risk management profile in several ways: stagnant water in pump casings during off-cycles supports biological growth, leaking mechanical seals can introduce nutrient contamination, and suction piping that traps water during drain-down extends water residence time. {note}

−

−# Delivery, Storage, and Handling {toc}

−

−## Packaging and Protection {toc}

−

−### Pumps shall be shipped in manufacturer's original packaging or skids with all openings sealed with manufacturer-supplied protective covers.

−

−### The covers shall remain in place until immediately before final piping connection.

−

−### Packaging shall be inspected upon delivery for damage; photograph any damage and notify the manufacturer before accepting the shipment.

−

−## Storage {toc}

−

−```datasheet

−label: Storage Requirements

−type: radio

−options:

− - "Standard — indoor, dry, less than 3 months until installation"

− - "Extended — indoor with manufacturer's preservation protocol, 3 to 12 months"

− - "Long-term — climate-controlled storage with monthly rotation, over 12 months"

−default: "Standard — indoor, dry, less than 3 months until installation"

−```

−

−### Equipment shall be stored indoors in a clean, dry location.

−

−### Where storage will exceed three months before installation, the pump manufacturer's long-term storage requirements shall be followed, which typically include rotating the shaft by hand monthly to prevent flat-spotting of bearings, ensuring desiccants remain effective inside motor enclosures, and protecting machined surfaces from corrosion with a rust-preventive coating.

−

−## Rigging and Lifting {toc}

−

−### Rigging and lifting shall use only the manufacturer's designated lift points.

−

−### The manufacturer's installation instructions shall be available at the rigging location and shall be reviewed before any rigging activity.

−

−### Lifting by piping connections, motor lifting eyes alone (for assembled base-mounted pumps), or wrapping straps around the pump casing risks damaging the casing, bending the pump shaft, or unbalancing the rigged load. {note}

−

−# Warranty {toc}

−

−## Warranty Period {toc}

−

−```datasheet

−label: Warranty Period

−type: select

−options:

− - "1 year from substantial completion (standard manufacturer warranty)"

− - "18 months from delivery or 12 months from startup, whichever is earlier"

− - "2 years from substantial completion"

− - "3 years from substantial completion (extended)"

− - "5 years from substantial completion (extended, premium service)"

−default: "1 year from substantial completion (standard manufacturer warranty)"

−```

−

−```datasheet

−label: Extended Warranty Coverage

−type: checkbox

−options:

− - "Parts only"

− - "Parts and labor (on-site repair)"

− - "Mechanical seal warranty (extended seal-only warranty for 3 or 5 years)"

− - "Annual preventive maintenance visit by manufacturer-authorized service"

− - "Next business day on-site response for critical pumps"

−default: "Parts only"

−```

−

−### Warranty shall cover defects in materials and workmanship under normal use and service conditions for the specified period.

−

−### The warranty shall include parts and on-site labor for repair or replacement during the warranty period.

−

−### The manufacturer shall commit in writing that replacement parts will remain available for the pump model for a minimum of fifteen years from the date of manufacture.

−

−## Warranty Exclusions {toc}

−

−### Warranty shall not apply to damage caused by improper installation contrary to the manufacturer's installation instructions, operation outside the published operating range, dry running, operation against a closed discharge valve beyond the manufacturer's allowable shutoff time, operation in service conditions outside those specified at the time of selection, or operation with system water chemistry outside the limits established by [[sync/hvac-water-treatment]].

−

−# Spare Parts {toc}

−

−## Spare Parts Provision {toc}

−

−```datasheet

−label: Spare Parts Required

−type: checkbox

−options:

− - "One complete mechanical seal assembly per pump model installed"

− - "One set of shaft sleeves per pump model installed (where sleeves are used)"

− - "One set of wear rings per pump model installed"

− - "One coupling elastomer spider per coupling (elastomeric jaw couplings)"

− - "One set of casing gaskets per pump model installed"

− - "One spare impeller per pump model installed (large pumps and critical service)"

− - "One spare pump (complete pump assembly) of the most common size on the project"

−default: "One complete mechanical seal assembly per pump model installed"

−```

−

−### Spare parts shall be provided at substantial completion as enumerated in the datasheet above.

−

−### Spare parts shall be packaged for long-term storage and clearly labeled with the corresponding pump tag number(s) and the pump model and serial number.

−

−### A spare mechanical seal is the single most valuable spare part to keep on hand because seal replacement is the most frequent pump maintenance event and a spare of the correct type and material for each installed pump model allows same-day repair without waiting for parts delivery. {note}

−

−## Maintenance Tools and Documentation {toc}

−

−```datasheet

−label: Maintenance Tools and Documentation

−type: checkbox

−options:

− - "Manufacturer's installation, operation, and maintenance manual per ANSI/HI 1.4"

− - "Pump-specific maintenance tools (impeller puller, seal installation fixtures)"

− - "Recommended preventive maintenance schedule"

− - "Bearing lubrication chart (grease type, quantity, frequency)"

− - "Spare parts ordering guide with manufacturer part numbers"

−default: "Manufacturer's installation, operation, and maintenance manual per ANSI/HI 1.4"

−```

+---

+title: HVAC Pumps

+category: Mechanical / Piping & Pumps

+description: >

+ When to use: Rotodynamic (centrifugal) pumps that circulate water and water-glycol solutions for building heating, cooling, and heat-rejection service. Covers closed-loop heating hot water and chilled water pumps, open-loop condenser water pumps serving cooling towers and fluid coolers, condenser loops serving water-source heat pumps, and the vertical turbine pumps used where the supply level sits below the pump. Addresses the pump end, the driving motor, the baseplate or frame, the coupling, shaft sealing, vibration isolation, factory and field acceptance testing, and the coordination items that decide whether the installed pump reaches its certified curve.

+ Not intended for: Fire pumps under NFPA 20. Domestic water booster and domestic hot water recirculation pumps. Sewage, sump, and lift-station pumps. Positive-displacement pumps of any kind, including chemical feed and fuel oil pumps. Refrigerant and brine pumps internal to refrigeration machines. Pumps furnished as an integral, factory-piped part of a packaged chiller, boiler, or heat pump unit, which are governed by the standard for that equipment. Hydronic piping, valves, and specialties beyond the pump flanges are covered in [[sync/hydronic-piping]]; variable frequency drives are covered in [[sync/hvac-variable-frequency-drives]]; chemical treatment of the circulated fluid is covered in [[sync/hvac-water-treatment]]; system flow balancing is covered in [[sync/testing-adjusting-and-balancing]].

+---

+# Scope {toc}

+## Boundary of Work {toc}

+### This standard governs the pump assembly as a unit of supply: the pump end from the suction connection through the discharge connection, the driving motor, the baseplate or mounting frame, the coupling and its guard, the shaft seal, and the accessories the pump manufacturer mounts before shipment. {note}

+### The standard reaches past the equipment itself into three execution activities that determine whether the pump performs as selected — setting and grouting, coupling alignment, and the arrangement of the suction piping immediately upstream of the pump. A pump that meets its certified curve on a factory test stand and fails in the field almost always fails for one of those three reasons rather than for a defect in the machine. {note}

+### Work outside this boundary is governed by the standards named below, and this standard defers to them rather than restating their requirements: {note}

+- Piping, valves, strainers, flexible connectors, and pipe supports beyond the pump connections — [[sync/hydronic-piping]]

+- Variable frequency drives, including drive programming, output filtering, and motor cable length limits — [[sync/hvac-variable-frequency-drives]]

+- Chemical treatment, filtration, and biological control of the circulated fluid — [[sync/hvac-water-treatment]]

+- System flow balancing and the verification of terminal flow rates — [[sync/testing-adjusting-and-balancing]]

+- Monitoring, alarming, sequencing, and staging logic resident in the control system — [[sync/building-automation-system]]

+### Open-loop condenser water systems carry a Legionella exposure that closed loops do not, and the building water management program required by ANSI/ASHRAE 188 covers the whole system rather than the pump alone. This standard states only the pump-side installation measures that feed that program; the program itself belongs to [[sync/hvac-water-treatment]]. {note}

+## Terms Used in This Standard {toc}

+### The following terms carry their Hydraulic Institute meanings throughout this standard: {note}

+- Best efficiency point (BEP) — the flow at which the pump reaches its maximum efficiency at a given impeller diameter and speed

+- Preferred operating region (POR) and allowable operating region (AOR) — the flow bands defined in ANSI/HI 9.6.3 relative to BEP flow

+- NPSH required (NPSHr) — the suction-side head above vapor pressure at which the pump suffers a defined loss of head, published by the manufacturer as a function of flow

+- NPSH available (NPSHa) — the suction-side head above vapor pressure the system delivers to the pump suction, calculated by the designer

+- Pump energy index (PEI) — the ratio defined in 10 CFR Part 431 Subpart Y comparing a pump's weighted energy rating to the minimally compliant baseline

+- Rated flow and design flow — the flow the pump is selected to deliver at the design total dynamic head, as scheduled on the contract documents

+# Referenced Standards {toc}

+## Equipment, materials, and installation shall comply with the latest adopted edition of each of the following unless a specific edition is cited.

+## Where referenced standards conflict, the more stringent requirement shall govern unless the Engineer of Record directs otherwise in writing.

+| Standard | Title |

+|----------|-------|

+| ANSI/HI 1.1-1.2 | Rotodynamic Centrifugal Pumps for Nomenclature and Definitions |

+| ANSI/HI 1.3 | Rotodynamic Centrifugal Pumps for Design and Application |

+| ANSI/HI 1.4 | Rotodynamic Centrifugal Pumps for Manuals Describing Installation, Operation, and Maintenance |

+| ANSI/HI 2.1-2.2 | Rotodynamic Vertical Pumps for Nomenclature and Definitions |

+| ANSI/HI 9.6.1 | Rotodynamic Pumps Guideline for NPSH Margin |

+| ANSI/HI 9.6.3 | Rotodynamic Pumps Guideline for Operating Regions |

+| ANSI/HI 9.6.4 | Rotodynamic Pumps for Vibration Measurements and Allowable Values |

+| ANSI/HI 9.8 | Rotodynamic Pumps for Pump Intake Design |

+| ANSI/HI 14.6 | Rotodynamic Pumps for Hydraulic Performance Acceptance Tests |

+| ANSI/HI 40.6 | Methods for Rotodynamic Pump Efficiency Testing |

+| 10 CFR Part 431 | Energy Efficiency Program for Certain Commercial and Industrial Equipment (Subpart Y, Pumps) |

+| ANSI/ASHRAE/IES 90.1 | Energy Standard for Sites and Buildings Except Low-Rise Residential Buildings |

+| ANSI/ASHRAE 188 | Legionellosis: Risk Management for Building Water Systems |

+| NEMA MG 1 | Motors and Generators |

+| NEMA 250 | Enclosures for Electrical Equipment (1000 Volts Maximum) |

+| NFPA 70 | National Electrical Code (Article 430) |

+| ASME B16.1 | Gray Iron Pipe Flanges and Flanged Fittings (Classes 25, 125, and 250) |

+| ASME B16.5 | Pipe Flanges and Flanged Fittings, NPS 1/2 Through NPS 24 |

+| ASTM A48 | Gray Iron Castings |

+| ASTM A536 | Ductile Iron Castings |

+| ASTM A276 | Stainless Steel Bars and Shapes |

+| ASTM B584 | Copper Alloy Sand Castings for General Applications |

+| ISO 21940-11 | Mechanical Vibration, Rotor Balancing (Procedures and Tolerances for Rotors with Rigid Behaviour) |

+| ASCE/SEI 7 | Minimum Design Loads and Associated Criteria for Buildings and Other Structures |

+| IBC | International Building Code |

+| OSHA 29 CFR 1910.219 | Mechanical Power-Transmission Apparatus |

+| MSS SP-58 | Pipe Hangers and Supports, Materials, Design, Manufacture, Selection, Application, and Installation |

+# Submittals {toc}

+## Action Submittals {toc}

+### The Contractor shall submit the following for review and approval before any pump is released for fabrication:

+- Product data for each pump tag, identifying configuration, casing pattern, connection size and type, and shipping weight

+- Certified performance curve for each pump tag at the selected impeller diameter and design speed, plotted from shutoff to runout, showing head, efficiency, brake horsepower, NPSHr, and the minimum continuous stable flow

+- Selection report stating design flow, design head, selected impeller diameter, maximum catalog impeller diameter, efficiency at the design point, brake horsepower at the design point, and the design flow expressed as a percentage of BEP flow

+- Pump energy index value and the equipment class under which it was determined

+- NPSH available calculation for each pump, prepared by the Engineer of Record, evaluated at the design point and at runout

+- Motor data including nameplate ratings, nominal and guaranteed efficiency, power factor, service factor, insulation system, bearing arrangement, and inverter-duty rating

+- Shaft seal data identifying arrangement, face materials, elastomers, flush plan, and pressure and temperature limits

+- Materials of construction for casing, impeller, shaft, shaft sleeve, wear rings, and fasteners

+- Baseplate drawing showing anchor bolt pattern, grout dam, leveling provisions, and the grout the manufacturer requires

+- Coupling data including type, spacer dimension, and the manufacturer's published alignment tolerance

+- Vibration isolation product data including rated load, static deflection, and natural frequency at the operating load

+- Seismic restraint calculations and attachment details, stamped by a professional engineer registered in the project jurisdiction

+- Coordination drawings showing the pump footprint, suction and discharge piping arrangement, motor and impeller removal clearances, and maintenance access

+```datasheet

+label: Action Submittals Required

+type: checkbox

+options:

+ - "Pump product data by tag"

+ - "Certified performance curve, shutoff to runout"

+ - "Selection report with impeller trim and percent of BEP flow"

+ - "Pump energy index and equipment class"

+ - "NPSH available calculation by the Engineer of Record"

+ - "Motor data including efficiency and inverter-duty rating"

+ - "Shaft seal data"

+ - "Materials of construction"

+ - "Baseplate drawing with anchor pattern and grout dam"

+ - "Coupling data and published alignment tolerance"

+ - "Vibration isolation product data"

+ - "Seismic restraint calculations and details"

+ - "Coordination drawings with removal clearances"

+default:

+ - "Pump product data by tag"

+ - "Certified performance curve, shutoff to runout"

+ - "Selection report with impeller trim and percent of BEP flow"

+ - "Pump energy index and equipment class"

+ - "NPSH available calculation by the Engineer of Record"

+ - "Motor data including efficiency and inverter-duty rating"

+ - "Shaft seal data"

+ - "Materials of construction"

+ - "Coordination drawings with removal clearances"

+```

+### Fabrication and shipment shall not proceed until the action submittals for that pump tag have been returned marked no exceptions taken or make corrections as noted.

+### The selection report is the submittal that carries the most information per page: the ratio of design flow to BEP flow, the trim of the impeller relative to the maximum catalog diameter, and the brake horsepower at runout together predict most of what will go wrong with the pump over its life. {note}

+## Closeout Submittals {toc}

+### The Contractor shall submit the following before the pumps are accepted:

+- Operation and maintenance manuals meeting ANSI/HI 1.4 for each pump model furnished

+- As-built nameplate record for each installed pump, including serial number, as-installed impeller diameter, and motor serial number

+- Certified factory test report for each pump tag for which factory testing was required

+- Field startup report recording measured suction pressure, measured discharge pressure, calculated total dynamic head, measured flow, motor voltage and current, and the corresponding point on the certified curve

+- Coupling alignment record showing cold readings, the thermal offset applied, and readings taken after thermal stabilization

+- Baseline vibration measurements taken at the pump and motor bearing housings

+- Water treatment acceptance record for the loop the pump serves, obtained from the party responsible under [[sync/hvac-water-treatment]]

+- Warranty documentation correlating each serial number to its installation date and warranty expiration date

+- Spare parts inventory identifying each item by pump tag and manufacturer part number

+```datasheet

+label: Closeout Submittals Required

+type: checkbox

+options:

+ - "Operation and maintenance manuals per ANSI/HI 1.4"

+ - "As-built nameplate record with installed impeller diameter"

+ - "Certified factory test report"

+ - "Field startup report referenced to the certified curve"

+ - "Coupling alignment record, cold and thermally stabilized"

+ - "Baseline vibration measurements"

+ - "Water treatment acceptance record for the served loop"

+ - "Warranty documentation by serial number"

+ - "Spare parts inventory by pump tag and part number"

+default:

+ - "Operation and maintenance manuals per ANSI/HI 1.4"

+ - "As-built nameplate record with installed impeller diameter"

+ - "Field startup report referenced to the certified curve"

+ - "Coupling alignment record, cold and thermally stabilized"

+ - "Baseline vibration measurements"

+ - "Warranty documentation by serial number"

+ - "Spare parts inventory by pump tag and part number"

+```

+### The as-installed impeller diameter shall be recorded from the pump nameplate or from direct measurement, not copied from the submitted selection.

+### An impeller trimmed in the field, or a pump shipped with a diameter other than the one submitted, invalidates every later comparison against the certified curve. Recording the diameter at closeout is what makes the curve usable years afterward, when a facility engineer is trying to decide whether a pump has degraded or was simply never the pump on the drawing. {note}

+# Quality Assurance {toc}

+## Manufacturer Qualifications {toc}

+### The pump manufacturer shall have continuously designed and produced rotodynamic pumps of the configuration furnished for not less than the period indicated in the datasheet.

+```datasheet

+label: Minimum Manufacturer Experience

+type: range

+unit: years

+options:

+ min: 0

+ max: 25

+ setpoints: [0, 3, 5, 10, 15, 20, 25]

+default: 10

+```

+### The manufacturer shall maintain a documented quality management system covering casting inspection, hydrostatic testing, assembly, and performance testing.

+### The manufacturer shall commit in writing that replacement parts for the pump model furnished will remain available for not less than the period indicated in the datasheet, measured from the date of manufacture.

+```datasheet

+label: Minimum Replacement Parts Availability Period

+type: range

+unit: years

+options:

+ min: 5

+ max: 30

+ setpoints: [5, 10, 15, 20, 25, 30]

+default: 15

+```

+## Single-Source Responsibility for the Assembly {toc}

+### The pump end, motor, baseplate or frame, coupling, and coupling guard shall be furnished as a single coordinated assembly by or through one pump manufacturer.

+### The pump manufacturer shall be responsible for the hydraulic performance of the assembly, the mechanical compatibility of its components, and the dimensional coordination of the baseplate, coupling, and motor.

+### Unless the Contract Documents direct otherwise, the pump end and motor shall be assembled and aligned at the factory rather than mated in the field.

+### Where the Contract Documents direct field assembly of a pump end and a separately procured motor, responsibility for coupling selection, baseplate flatness, and alignment shall rest with the Contractor, and the pump manufacturer's performance obligation shall be limited to the pump end.

+### Splitting the supply is a real procurement pattern, usually driven by an owner's motor standardization program, and it is workable when the responsibility shift is stated in advance. What causes disputes is an unstated split discovered at startup, when a vibration problem has two suppliers each pointing at the other. {note}

+## Installer and Startup Qualifications {toc}

+### Setting, grouting, and coupling alignment of base-mounted pumps shall be performed by personnel who can document prior experience with pumps of comparable size and configuration.

+### Coupling alignment shall be performed by a millwright or pump service technician qualified in the alignment method indicated in the datasheet.

+### Where the pump manufacturer offers a factory startup service for the model furnished, the Contractor shall engage that service for the initial startup of each pump at or above the horsepower indicated in the datasheet.

+```datasheet

+label: Motor Horsepower Threshold for Manufacturer Startup Service

+type: range

+unit: hp

+options:

+ min: 0

+ max: 200

+ setpoints: [0, 5, 10, 25, 50, 75, 100, 200]

+default: 50

+```

+### A setpoint of 0 hp requires factory startup on every pump on the project. {note}

+## Pre-Installation Conference {toc}

+### A pre-installation conference shall be held before the first pump is set, attended by the mechanical contractor, the pump manufacturer's representative, the controls contractor, the balancing agency, and the Owner's representative.

+### The conference agenda shall cover rigging and setting sequence, housekeeping pad and grouting procedure, verification of the suction piping arrangement against the approved coordination drawings, alignment method and tolerance, startup sequence, and the point in the schedule at which system flow will be measured against the pump curve.

+### Minutes of the conference shall be distributed to all attendees and to the Engineer of Record within five business days.

+# Service Conditions {toc}

+## Circulated Fluid {toc}

+### The circulated fluid shall be as indicated in the datasheet, and all wetted components shall be compatible with that fluid at the operating temperature and treatment chemistry.

+```datasheet

+label: Circulated Fluid

+type: select

+options:

+ - "Water"

+ - "Propylene glycol and water solution"

+ - "Ethylene glycol and water solution"

+ - "Methanol and water solution"

+ - "Deionized or demineralized water"

+default: "Water"

+```

+```datasheet

+label: Glycol Concentration by Volume

+type: range

+unit: '%'

+drawing_ref: "fluid concentration as indicated on the mechanical schedules"

+options:

+ min: 0

+ max: 60

+ setpoints: [0, 10, 20, 25, 30, 35, 40, 50, 60]

+default: deferred

+```

+### Where the circulated fluid is a glycol solution, the pump selection shall be corrected for the density and viscosity of the solution at the minimum operating temperature.

+### Where the circulated fluid is a glycol solution, the shaft seal elastomers and any nonmetallic wetted parts shall be confirmed compatible with the glycol type and its inhibitor package.

+### Glycol raises density and viscosity together, and the two work in opposite directions on the selection: higher density raises the brake horsepower required for the same head in feet, while higher viscosity lowers both head and efficiency relative to the water curve. A selection taken straight off a water curve at 40 percent propylene glycol and 20°F will be short on head and long on motor load at the same time. {note}

+### Deionized and demineralized water is aggressive toward copper alloys in a way that treated hydronic water is not, and the material selections that suit a treated closed loop do not carry over to it. {note}

+## Loop Type {toc}

+### The loop the pump serves shall be as indicated in the datasheet.

+```datasheet

+label: Hydronic Loop Type

+type: radio

+options:

+ - "Closed loop"

+ - "Open loop, cooling tower or fluid cooler condenser water"

+ - "Open loop, other"

+default: "Closed loop"

+```

+### Where the pump serves an open loop, the wetted material selections, the shaft seal flush arrangement, and the strainer provisions upstream of the pump shall account for suspended solids and dissolved oxygen continuously replenished at the tower.

+### A closed loop reaches a stable, largely deoxygenated chemistry within weeks of fill and holds it, so wear rates settle to a low steady value. An open loop never does: the tower aerates the water on every pass, concentrates dissolved solids by evaporation, and admits airborne debris. The same pump in the two services sees wear rates that differ by roughly an order of magnitude at the seal faces and wear rings. {note}

+## Operating Temperature and Pressure {toc}

+### The pump and all wetted components shall be rated for continuous operation across the temperature range indicated in the datasheet.

+```datasheet

+label: Maximum Continuous Fluid Temperature

+type: range

+unit: °F

+drawing_ref: "design temperatures as indicated on the mechanical schedules"

+options:

+ min: 32

+ max: 300

+ setpoints: [32, 40, 60, 100, 140, 180, 200, 220, 250, 300]

+default: deferred

+```

+```datasheet

+label: Minimum Continuous Fluid Temperature

+type: range

+unit: °F

+drawing_ref: "design temperatures as indicated on the mechanical schedules"

+options:

+ min: 10

+ max: 180

+ setpoints: [10, 20, 32, 36, 40, 45, 55, 65, 100, 180]

+default: deferred

+```

+### The pump casing and its connections shall be rated for not less than the system maximum working pressure indicated in the datasheet at the maximum continuous fluid temperature.

+```datasheet

+label: System Maximum Working Pressure at the Pump

+type: range

+unit: psig

+drawing_ref: "system working pressure as indicated on the mechanical drawings"

+options:

+ min: 75

+ max: 400

+ setpoints: [75, 125, 175, 250, 300, 400]

+default: deferred

+```

+### The pressure rating of a flanged cast iron casing falls as temperature rises, so the pressure class shall be established at the coincident maximum pressure and maximum temperature rather than at either one alone.

+### Where the pump can be subjected to system static pressure while shut down, that static pressure shall be included in the working pressure used to establish the casing rating.

+### The coincident condition is what catches designers out on tall buildings and on high-temperature heating water. A casing that is comfortably rated at 250 psig cold can be below its allowable working pressure at 250°F, and a pump at the bottom of a 20-story riser sees the full static column whether it is running or not. {note}

+## Site Elevation {toc}

+### The site elevation shall be as indicated in the datasheet, and the NPSH available calculation shall use the atmospheric pressure corresponding to that elevation rather than sea-level pressure.

+```datasheet

+label: Site Elevation

+type: range

+unit: ft

+drawing_ref: "site elevation as indicated on the contract documents"

+options:

+ min: 0

+ max: 12000

+ setpoints: [0, 1000, 2000, 3300, 5000, 6600, 8000, 10000, 12000]

+default: deferred

+```

+### Where the site elevation exceeds 3,300 ft, the motor manufacturer shall confirm the motor rating at that elevation and at the maximum ambient temperature at the pump location.

+### Where the site elevation exceeds 3,300 ft, the pump manufacturer shall confirm that the selected pump remains within its allowable operating region at the corrected NPSH available.

+### Atmospheric pressure is worth roughly 33.9 ft of water column at sea level and roughly 27.8 ft at 5,000 ft. That six-foot difference is larger than the entire NPSH margin on many condenser water selections, which is why a pump specified from a sea-level catalog and installed in Denver can cavitate on the first hot day. Motor derating at altitude comes from the same thinning air, acting on convective cooling instead of suction head. {note}

+# Hydraulic Selection {toc}

+## Design Duty Point {toc}

+### Each pump shall be selected and certified to deliver the design flow at the design total dynamic head indicated in the datasheet.

+```datasheet

+label: Design Flow

+type: range

+unit: gpm

+drawing_ref: "mechanical equipment schedule"

+options:

+ min: 10

+ max: 12000

+ setpoints: [10, 25, 50, 75, 100, 150, 200, 300, 400, 500, 750, 1000, 1500, 2000, 3000, 4000, 6000, 8000, 12000]

+default: deferred

+```

+```datasheet

+label: Design Total Dynamic Head

+type: range

+unit: ft

+drawing_ref: "mechanical equipment schedule"

+options:

+ min: 10

+ max: 600

+ setpoints: [10, 20, 30, 40, 50, 60, 75, 90, 100, 125, 150, 200, 250, 300, 400, 500, 600]

+default: deferred

+```

+### The certified curve submitted for each pump tag shall be plotted at the selected impeller diameter and at the design speed, not at the maximum catalog diameter.

+## Operating Region {toc}

+### The design operating point shall fall within the operating region indicated in the datasheet, determined per ANSI/HI 9.6.3 for the specific speed of the pump selected.

+```datasheet

+label: Required Operating Region at the Design Point

+type: radio

+options:

+ - "Preferred operating region per ANSI/HI 9.6.3"

+ - "Allowable operating region per ANSI/HI 9.6.3"

+default: "Preferred operating region per ANSI/HI 9.6.3"

+```

+### No pump shall be selected to operate beyond its allowable operating region at any condition the control sequence can produce, including the runout condition that occurs with all control valves open.

+### Where a variable-speed pump will operate below the preferred operating region at part load, the selection report shall identify the lowest flow the control sequence permits and confirm that flow lies within the allowable operating region.

+### The preferred operating region is not a fixed band. ANSI/HI 9.6.3 puts it as wide as 70 to 120 percent of BEP flow for low specific speed pumps and narrows it for higher specific speed designs, so the acceptable window has to be read for the pump actually selected rather than assumed. {note}

+### The two ways out of the region fail differently. To the left of BEP, internal recirculation in the impeller eye drives noise, radial load, and seal chamber turbulence at flows that look harmless on a curve. To the right, radial load rises again and NPSHr climbs steeply, so a pump that runs out during a low-load reset can cavitate at a condition nobody tested. {note}

+## Impeller Trim and Selection Margin {toc}

+### The impeller diameter selected shall not exceed the percentage of the maximum catalog diameter indicated in the datasheet.

+```datasheet

+label: Maximum Selected Impeller Diameter, Percent of Maximum Catalog Diameter

+type: range

+unit: '%'

+options:

+ min: 70

+ max: 100

+ setpoints: [70, 75, 80, 85, 90, 95, 100]

+default: 95

+```

+### The selected impeller diameter shall not be below the minimum trim the pump manufacturer publishes for the casing, and the certified efficiency at the trimmed diameter shall be stated in the selection report.

+### No safety factor shall be added to the scheduled flow or head by the Contractor or by the pump supplier; where the selection requires margin, that margin shall be established by the Engineer of Record and reflected in the scheduled duty.

+### Leaving headroom below the maximum catalog diameter is cheap insurance against a system that turns out stiffer than calculated: a larger impeller can be fitted in the same casing later, while a pump already at maximum diameter has to be replaced. Trimming too far in the other direction costs efficiency, because the trimmed vane no longer matches the casing volute. {note}

+### Stacked safety factors are the most common cause of oversized hydronic pumps. When the designer adds margin to the calculated head, the supplier adds margin to the selection, and the installer specifies the next frame size up, the pump lands far to the left of BEP and runs there for thirty years. {note}

+## Net Positive Suction Head {toc}

+### The Engineer of Record shall calculate the NPSH available at the pump suction at the design point and at runout, accounting for atmospheric pressure at the site elevation, static suction head or lift, suction piping and fitting losses, and the vapor pressure of the circulated fluid at the maximum continuous fluid temperature.

+### The NPSH available shall exceed the NPSH required by at least the margin ratio indicated in the datasheet.

+```datasheet

+label: Minimum NPSH Margin Ratio, NPSHa Divided by NPSHr

+type: range

+options:

+ min: 1.0

+ max: 2.5

+ setpoints: [1.0, 1.1, 1.2, 1.3, 1.5, 1.75, 2.0, 2.5]

+```

+### The NPSH available shall exceed the NPSH required by at least the absolute margin indicated in the datasheet, applied in addition to the margin ratio.

+```datasheet

+label: Minimum Absolute NPSH Margin

+type: range

+unit: ft

+options:

+ min: 0

+ max: 20

+ setpoints: [0, 2, 3, 5, 7, 10, 15, 20]

+```

+### Where neither an NPSH margin ratio nor an absolute margin is indicated in the datasheet, the margin shall be established per ANSI/HI 9.6.1 for the service and suction energy of the pump selected, and the value used shall be stated in the selection report.

+### Where the calculated NPSH margin is not met at any operating condition the control sequence can produce, the Contractor shall notify the Engineer of Record before releasing the pump for fabrication.

+### ANSI/HI 9.6.1 does not publish one margin. It gives a range of roughly 1.1 to 2.5 times NPSHr, selected by service category and by suction energy, so a low-suction-energy closed-loop circulator and a high-suction-energy condenser water pump land at opposite ends of that band. A ratio alone also behaves badly at small numbers, which is why an absolute floor in feet is specified alongside it: 1.2 times an NPSHr of 4 ft leaves less than a foot of real margin. {note}

+### Cavitation from a thin margin is intermittent and quiet at first. It removes metal from the impeller vane just behind the leading edge, where nothing is visible until the impeller comes out, and the first symptom an operator notices is usually a seal that will not stay in service. {note}

+## Rotative Speed {toc}

+### The rotative speed at the design point shall not exceed the maximum indicated in the datasheet.

+```datasheet

+label: Maximum Rotative Speed at the Design Point

+type: range

+unit: RPM

+options:

+ min: 880

+ max: 3550

+ setpoints: [880, 1150, 1750, 3550]

+```

+### The rotative speed shall be reported in the selection report for each pump tag, together with the NPSHr and efficiency at the design point at that speed.

+### Speed is an outcome of the selection rather than an input to it. The designer fixes flow, head, and the available NPSH; the combination of those three with the required operating region determines which speeds can produce a viable pump, and often only one can. A datasheet entry here caps the speed when a project has a reason to, and stays empty when it does not. {note}

+### Doubling the speed roughly doubles impeller tip velocity, and NPSHr rises steeply with it, so a 3550 RPM selection needs materially more suction head than an 1750 RPM selection of the same duty. Working against that, the faster pump is physically smaller and cheaper, and reaches high heads at low flow that a slower pump cannot reach in one stage. Where suction head is plentiful and head is high relative to flow, the higher speed is what makes the duty achievable at all. {note}

+### Seal face wear and bearing load both scale with speed, so the maintenance interval on a 3550 RPM pump in continuous service is shorter than on the same duty at 1750 RPM, and the noise it radiates into the mechanical room is higher. Where a pump runs continuously in a space adjoining occupied areas, those two consequences usually decide the speed. {note}

+## Low-Flow Protection {toc}

+### The minimum continuous stable flow published by the pump manufacturer shall be stated on the certified curve for each pump tag.

+### Where the control sequence can hold the pump below its minimum continuous stable flow, low-flow protection shall be provided as indicated in the datasheet.

+```datasheet

+label: Low-Flow Protection

+type: radio

+options:

+ - "Continuous minimum-flow bypass to the suction header"

+ - "Automatic recirculation valve"

+ - "Control sequence limits that hold flow above the minimum"

+ - "None, system design maintains flow above the minimum continuous stable flow"

+```

+### A pump held below its minimum continuous stable flow converts most of its shaft power into heat in the casing. In a small closed loop the water in the casing can approach its saturation temperature within minutes, at which point the pump is boiling its own working fluid and the seal is running dry. {note}

+# Energy Performance {toc}

+## Pump Energy Index {toc}

+### Where the pump falls within an equipment class regulated under 10 CFR Part 431 Subpart Y, its pump energy index shall not exceed the value indicated in the datasheet.

+```datasheet

+label: Maximum Pump Energy Index

+type: range

+options:

+ min: 0.5

+ max: 1.0

+ setpoints: [0.5, 0.6, 0.7, 0.8, 0.9, 0.95, 1.0]

+default: 1.0

+```

+### The pump energy index reported for each pump tag shall be determined per ANSI/HI 40.6 and shall identify whether it is the constant-load or variable-load index.

+### The index reported shall be the constant-load index for a pump furnished without continuous speed control and the variable-load index for a pump furnished with continuous speed control.

+### Where the pump falls outside the regulated equipment classes, the submittal shall state which scope limit places it outside rather than omitting the index.

+### The regulated classes are end-suction close-coupled, end-suction frame-mounted with its own bearings, in-line, radially split multistage vertical in-line diffuser casing, and submersible turbine. The scope is bounded by flow of 25 gpm or more at BEP, head of 459 ft or less at BEP with the full-diameter impeller, 1 to 200 hp at BEP flow, and two-pole or four-pole induction driver speeds. A large split-case pump, a low-flow circulator, and a line-shaft cooling tower pump can all fall outside it. {note}

+### An index of 1.00 is the regulated ceiling rather than a target, and lower is better: the index is a ratio against a minimally compliant baseline pump of the same class and specific speed. The two variants are weighted differently — the constant-load index averages performance at 75, 100, and 110 percent of BEP flow, while the variable-load index averages 25, 50, 75, and 100 percent — so the two numbers are not comparable to each other. {note}

+## Hydraulic Efficiency {toc}

+### The pump hydraulic efficiency at the design point shall be not less than the value indicated in the datasheet.

+```datasheet

+label: Minimum Pump Hydraulic Efficiency at the Design Point

+type: range

+unit: '%'

+options:

+ min: 40

+ max: 90

+ setpoints: [40, 50, 55, 60, 65, 70, 75, 80, 85, 90]

+```

+### Where the datasheet indicates no minimum efficiency, the certified efficiency at the design point shall be reported for each pump tag and shall be evaluated against the manufacturer's published BEP efficiency for that pump.

+### Achievable efficiency is a function of size, specific speed, and configuration, and no single number spans the range this standard covers. A 50 gpm in-line circulator and a 4,000 gpm double-suction split-case pump differ by more than twenty efficiency points at their respective best points, so a minimum written for one is either trivial or unbuildable for the other. {note}

+### For a variable-speed pump the design-point efficiency is the least representative number on the curve, because the pump spends most of its hours somewhere else. The useful comparison is the efficiency weighted across the load profile, which is exactly what the variable-load pump energy index reports. {note}

+## Flow Control Mode {toc}

+### The flow control mode for the pump system shall be as indicated in the datasheet.

+```datasheet

+label: Pump Flow Control Mode

+type: radio

+options:

+ - "Constant speed, constant flow"

+ - "Constant speed, staged pumps"

+ - "Variable speed, continuous speed control"

+```

+### Where ANSI/ASHRAE/IES 90.1 applies to the project, a pumping system with total pump system power above 10 hp that serves control valves modulating as a function of load shall be designed for variable flow and shall be capable of reducing flow to 50 percent or less of design flow.

+### Where ANSI/ASHRAE/IES 90.1 applies and the individual pump serves a variable-flow system with pump system power above 5 hp, controls shall limit pump motor demand to no more than 30 percent of design wattage at 50 percent of design flow.

+### Variable-speed pumps shall be driven by drives conforming to [[sync/hvac-variable-frequency-drives]].

+### The 30 percent demand limit at half flow is what makes the requirement a speed-control requirement in practice rather than a flow-reduction requirement. Throttling a constant-speed pump to half flow leaves motor demand well above 30 percent because the pump simply rides up its curve; reducing speed follows the affinity relationship, where power falls roughly with the cube of speed. {note}

+# Pump Configuration and Pressure Boundary {toc}

+## Pump Configuration {toc}

+### The configuration of each pump shall be as indicated in the datasheet.

+```datasheet

+label: Pump Configuration

+type: select

+options:

+ - "End suction, frame mounted with its own bearings"

+ - "End suction, close coupled"

+ - "In-line, close coupled"

+ - "In-line, split coupled"

+ - "Horizontal split case, double suction"

+ - "Vertical multistage, radially split diffuser casing"

+ - "Vertical turbine, line shaft with above-deck motor"

+ - "Vertical turbine, submersible motor"

+```

+### Configuration is a consequence of the duty, the space, and the suction arrangement rather than a preference, which is why this field carries no default. Frame-mounted end suction covers the broad middle of commercial hydronic duty and keeps the seal accessible without disturbing the motor. Close-coupled construction removes the coupling, the baseplate, and the alignment problem, at the cost of pulling the motor to reach the seal. {note}

+### In-line pumps carry their own weight into the piping and free the floor, which decides the question wherever mechanical room area is the binding constraint. Split-case double-suction pumps balance axial thrust hydraulically and hold a flatter efficiency curve, advantages that matter at the high flows where their footprint can be justified. {note}

+### Where the supply water level sits below the pump, no horizontal configuration solves the problem well, and vertical turbine construction with the bowls submerged is what removes the suction lift entirely. That is the usual condition at a cooling tower whose sump is below the pump room floor. {note}

+### Split-coupled in-line construction sits between the close-coupled and frame-mounted cases: the motor and pump have separate shafts joined by a spacer coupling, so the seal can be changed with the motor in place while the assembly still hangs in the line. {note}

+## Pump Arrangement and Redundancy {toc}

+### The number of pumps and the redundancy arrangement for each pump system shall be as indicated in the datasheet.

+```datasheet

+label: Pump Arrangement

+type: select

+drawing_ref: "mechanical equipment schedules and flow diagrams"

+options:

+ - "Single pump, no redundancy"

+ - "Duty and standby, two pumps at 100 percent capacity"

+ - "Parallel duty, two pumps at 50 percent capacity"

+ - "Parallel duty with standby, three pumps at 50 percent capacity"

+ - "Parallel variable-speed set, three or more pumps staged by demand"

+ - "Series, primary and secondary"

+default: deferred

+```

+### Where pumps operate in parallel, each pump shall be selected on a continuously rising head-capacity characteristic from the design point to shutoff.

+### Where pumps operate in parallel, the selection report shall state the flow each pump delivers when running alone with the system fully open, and the motor shall be non-overloading at that flow.

+### A drooping or flat characteristic near shutoff lets two parallel pumps find two different operating points on the same head, so one pump backs the other down and can push it below minimum flow while the control system reports both running normally. {note}

+### The single-pump runout condition is the load case parallel sets are most often sized wrong for. With one pump down and the system wide open, the surviving pump moves far to the right of its design point, where brake horsepower on a rising power curve is at its highest. {note}

+## Casing Pressure Boundary {toc}

+### Pump suction and discharge connections shall be of the type indicated in the datasheet.

+```datasheet

+label: Pump Connection Type

+type: select

+options:

+ - "Flanged, ASME B16.1 Class 125"

+ - "Flanged, ASME B16.1 Class 250"

+ - "Flanged, ASME B16.5 Class 150"

+ - "Flanged, ASME B16.5 Class 300"

+ - "Grooved end"

+ - "Threaded, NPT"

+ - "Companion flange with union"

+default: "Flanged, ASME B16.1 Class 125"

+```

+### Cast iron flanges shall conform to ASME B16.1 and steel flanges shall conform to ASME B16.5 for the class furnished.

+### Gasket, bolting, and mating flange requirements at the pump connections shall conform to [[sync/hydronic-piping]].

+### The casing shall be furnished with tapped connections as indicated in the datasheet, each fitted with a plug or a valved fitting before shipment.

+```datasheet

+label: Tapped Casing Connections

+type: checkbox

+options:

+ - "Casing drain at the low point"

+ - "Casing vent at the high point"

+ - "Suction gauge connection"

+ - "Discharge gauge connection"

+ - "Seal chamber flush connection"

+ - "Seal chamber quench connection"

+default:

+ - "Casing drain at the low point"

+ - "Casing vent at the high point"

+ - "Suction gauge connection"

+ - "Discharge gauge connection"

+```

+### A casing vent is what lets an operator clear the air pocket that collects at the top of a volute after a system fill or a partial drain, and without it the first start after a drain-down runs the seal dry for as long as the pocket survives. {note}

+## Casing Material {toc}

+### The pump casing shall be of the material indicated in the datasheet.

+```datasheet

+label: Casing Material

+type: select

+options:

+ - "Cast iron"

+ - "Ductile iron"

+ - "Bronze"

+ - "Carbon steel"

+ - "Stainless steel, Type 316"

+default: "Cast iron"

+```

+### Cast iron casings shall conform to ASTM A48, Class 30 or higher.

+### Ductile iron casings shall conform to ASTM A536.

+### Bronze casings shall conform to ASTM B584.

+### Stainless steel casings shall be Type 316 or Type 316L.

+### Cast iron develops a stable protective film in treated, deoxygenated closed-loop water and holds its dimensions across the temperature swings of heating and chilled water service, which is why it dominates that application. Where the water is continuously aerated, chloride-bearing, or outside the treatment program's control, that film does not form and the corrosion allowance the casting relies on is consumed instead. {note}

+### Where a pump will be left drained or partially drained between seasons, the interior of a cast iron casing rusts in air far faster than it corrodes in treated water, and the scale that forms is carried into the seal faces on the next start. Bronze and stainless casings do not have this failure mode, which is what recommends them for seasonal or intermittently drained service. {note}

+# Rotating Element {toc}

+## Impeller {toc}

+### The impeller shall be of the type indicated in the datasheet, keyed or threaded to the shaft and secured against loosening in the direction of rotation.

+```datasheet

+label: Impeller Type

+type: radio

+options:

+ - "Enclosed"

+ - "Semi-open"

+ - "Open"

+default: "Enclosed"

+```

+### The impeller shall be of the material indicated in the datasheet.

+```datasheet

+label: Impeller Material

+type: select

+options:

+ - "Bronze"

+ - "Cast iron"

+ - "Ductile iron"

+ - "Stainless steel, Type 316"

+ - "Stainless steel, duplex"

+ - "Glass-filled thermoplastic composite"

+default: "Bronze"

+```

+### Bronze impellers shall conform to ASTM B584.

+### The impeller shall be dynamically balanced to ISO 21940-11 grade G6.3 or finer, and the balance record shall be available to the Engineer of Record on request.

+### An enclosed impeller carries a shroud on both sides of the vanes, so its clearance to the casing is set by replaceable wear rings rather than by the casing itself. That is what makes the clearance restorable at overhaul, and it is the reason enclosed construction dominates clean hydronic service. Semi-open and open impellers give up that feature in exchange for tolerance of solids and easier clearance adjustment. {note}

+### A bronze impeller running in a cast iron casing sets up a galvanic pair in which the much larger casing is the anode, so the current density on the casing stays low and the arrangement is stable in treated water. Reversing the area ratio — a small iron part in a large bronze casing — is what makes galvanic pairing a problem. {note}

+## Wear Rings {toc}

+### Unless the datasheet indicates otherwise, pumps at or above 25 hp with enclosed impellers shall be furnished with renewable wear rings.

+### Wear rings shall be as indicated in the datasheet.

+```datasheet

+label: Wear Ring Arrangement

+type: radio

+options:

+ - "Renewable rings on both the casing and the impeller"

+ - "Renewable casing ring only"

+ - "No renewable rings, clearance formed by the casing and impeller"

+```

+```datasheet

+label: Wear Ring Material

+type: select

+options:

+ - "Bronze"

+ - "Stainless steel, Type 316"

+ - "Hardened stainless steel"

+ - "Filled fluoropolymer"

+ - "Not applicable, no renewable rings"

+```

+### Wear rings shall be secured against rotation and shall be renewable without machining the casing or the impeller.

+### Wear ring material shall be selected so that the ring pair does not gall on contact, which for a metallic pair means a hardness difference between the two rings.

+### The wear ring clearance is the only path from the discharge side of the impeller back to the suction eye, so as it opens the pump recirculates an increasing fraction of its own flow internally. The head-capacity curve barely moves while efficiency falls steadily, which is why the loss goes unnoticed until someone measures brake horsepower against flow. {note}

+### Renewable rings are what make that loss reversible. Restoring the clearance at overhaul returns the pump close to its original efficiency for the price of two rings, where a pump without them needs a new impeller, a new casing, or both. {note}

+## Shaft and Shaft Sleeve {toc}

+### The shaft shall be of the material indicated in the datasheet, sized so that the shaft deflection at the seal faces stays within the seal manufacturer's limit across the allowable operating region.

+```datasheet

+label: Shaft Material

+type: select

+options:

+ - "Carbon steel"

+ - "Alloy steel"

+ - "Stainless steel, Type 316"

+ - "Stainless steel, 17-4 PH"

+default: "Carbon steel"

+```

+### Stainless steel shafts shall conform to ASTM A276 for the grade furnished.

+### A renewable shaft sleeve shall be provided as indicated in the datasheet, sealed against leakage between the sleeve and the shaft.

+```datasheet

+label: Shaft Sleeve

+type: radio

+options:

+ - "Renewable sleeve through the seal chamber"

+ - "No sleeve, seal runs directly on the shaft"

+```

+### The shaft carries torque, the radial load the volute imposes, and the axial thrust the impeller develops, all at once, and it does so while holding the seal faces square to within a fraction of a thousandth of an inch. Shaft deflection at the seal is the quantity that decides seal life on a pump running away from BEP, which is why the seal manufacturer's deflection limit is the governing sizing criterion rather than stress. {note}

+### A sleeve moves the wear surface off the shaft onto a part that costs a fraction as much to replace, at the cost of a slightly larger shaft diameter through the seal chamber. Running a seal directly on a corrosion-resistant shaft eliminates the sleeve joint and the leak path with it. {note}

+## Bearings and Lubrication {toc}

+### Bearings shall be of the lubrication type indicated in the datasheet, arranged to carry the radial and axial loads the pump develops across its allowable operating region.

+```datasheet

+label: Bearing Lubrication

+type: radio

+options:

+ - "Regreasable antifriction bearings"

+ - "Oil-lubricated antifriction bearings"

+ - "Sealed antifriction bearings"

+```

+### Bearings shall be selected for a rating life not less than the value indicated in the datasheet, calculated at the design operating point.

+```datasheet

+label: Minimum Bearing Rating Life at the Design Point

+type: range

+unit: hours

+options:

+ min: 8760

+ max: 100000

+ setpoints: [8760, 17500, 25000, 40000, 50000, 100000]

+```

+### Where regreasable bearings are furnished, grease fittings and relief provisions shall be accessible without removing the coupling guard.

+### Where oil-lubricated bearings are furnished, a constant-level oiler and a sight glass shall be provided, and the oil grade and change interval shall be stated in the operation and maintenance manual.

+### Bearing rating life is calculated at one operating point, so it is only as representative as that point. A pump that spends its life at 60 percent of BEP flow carries a radial load several times the load at BEP, and the rating life at the design point overstates what the bearings will actually see. {note}

+### Sealed bearings need no maintenance and admit no contamination, which suits small and close-coupled pumps where the bearing is unlikely to outlive the motor anyway. Regreasable bearings can be maintained indefinitely and can also be destroyed by over-greasing, so the interval and quantity in the maintenance manual matter more than they appear to. {note}

+# Shaft Sealing {toc}

+## Seal Arrangement {toc}

+### The shaft seal for each pump shall be of the arrangement indicated in the datasheet.

+```datasheet

+label: Shaft Seal Arrangement

+type: select

+options:

+ - "Single mechanical seal, balanced"

+ - "Single mechanical seal, unbalanced"

+ - "Single cartridge mechanical seal"

+ - "Dual mechanical seal with pressurized barrier fluid"

+ - "Dual mechanical seal with unpressurized buffer fluid"

+ - "Compression packing with lantern ring"

+```

+### The seal shall be rated for the seal chamber pressure and the fluid temperature that occur at every condition the control sequence can produce, including the static pressure the pump sees while shut down.

+### Where compression packing is furnished, a lantern ring and a flush connection shall be provided, and the operation and maintenance manual shall state the leakage rate the packing requires for cooling.

+### Where the pump serves a space in which visible leakage is unacceptable, compression packing shall not be used unless the datasheet selects it and a drain is piped from the stuffing box.

+### A cartridge seal arrives from the seal manufacturer pre-assembled and pre-set on its own sleeve and gland, so field installation is a matter of sliding it on and releasing the setting clips. A component seal requires the installer to set spring compression by measurement, and a compression error of a sixteenth of an inch either leaks immediately or runs the faces hot. Where the crew changing seals is a building maintenance staff rather than a pump shop, that difference determines how long the second seal lasts. {note}

+### A balanced seal reduces the net closing force on the faces by stepping the sleeve diameter, which keeps face temperature manageable as seal chamber pressure rises. Unbalanced construction is simpler and less expensive, and it stays within its face loading limits at the lower chamber pressures typical of small closed-loop circulators. {note}

+### Compression packing is still in service on vertical turbine line shafts and on pumps where a controlled leak is tolerable and a seal replacement outage is not. It requires that leak to carry away face heat, so a stuffing box tightened until it stops dripping is a stuffing box that is about to score the sleeve. {note}

+## Seal Face Materials {toc}

+### The seal face combination shall be as indicated in the datasheet.

+```datasheet

+label: Mechanical Seal Face Combination

+type: select

+options:

+ - "Carbon against alumina ceramic"

+ - "Carbon against silicon carbide"

+ - "Carbon against tungsten carbide"

+ - "Silicon carbide against silicon carbide"

+ - "Tungsten carbide against tungsten carbide"

+```

+### Where the pump serves an open loop, or where the pump is installed in existing piping that has not been cleaned and flushed, the seal face combination shall be selected for tolerance of suspended solids.

+### Carbon running against a hard seat is the low-friction pairing, and it tolerates brief dry contact better than any hard-on-hard combination because the carbon sacrifices itself rather than heat-checking the mating ring. What it does not tolerate is particulate: any solid harder than carbon embeds in the softer face and turns it into a lap, and the wear rate climbs by orders of magnitude. {note}

+### Silicon carbide against silicon carbide and tungsten carbide against tungsten carbide both resist that embedding, which is what makes them the pairings used where solids are continuously present. Hard-on-hard faces run hotter and are far less forgiving of a dry start, so they trade one failure mode for another rather than removing both. {note}

+### Alumina ceramic and silicon carbide differ mainly in thermal conductivity and hardness. Silicon carbide moves face heat away several times faster, which widens the margin against thermal distortion at higher speeds and pressures; alumina is less expensive and entirely adequate where the chamber stays cool and clean. {note}

+## Seal Elastomers {toc}

+### Seal elastomers shall be as indicated in the datasheet and shall be compatible with the circulated fluid, its treatment chemistry, and the full operating temperature range.

+```datasheet

+label: Seal Elastomer

+type: select

+options:

+ - "EPDM"

+ - "Fluoroelastomer, FKM"

+ - "Perfluoroelastomer, FFKM"

+ - "Nitrile, NBR"

+ - "Tetrafluoroethylene propylene, FEPM"

+default: "EPDM"

+```

+### Where the system will be shock-treated, disinfected, or cleaned with chemicals outside the routine treatment program, elastomer compatibility with those chemicals shall be confirmed with the seal manufacturer and the treatment supplier before the procedure is performed.

+### EPDM is compatible with water, glycol solutions, and the amine and nitrite chemistries used in hydronic treatment, across the temperature range of ordinary heating and chilled water service, which is what makes it the near-universal choice in that service. It is also the elastomer that petroleum products attack fastest, so any system that can see oil is a system that needs a different one. {note}

+### Fluoroelastomer extends the usable temperature well above EPDM's limit and resists oxidizers and hydrocarbons, but it is attacked by hot water and steam at the top of its range and by some amine treatments. The two are close to complementary rather than one being a superset of the other. {note}

+## Seal Flush {toc}

+### The seal flush arrangement shall be as indicated in the datasheet, and the flush piping shall be furnished and mounted by the pump manufacturer.

+```datasheet

+label: Seal Flush Arrangement

+type: select

+options:

+ - "Internal recirculation from the casing discharge to the seal chamber"

+ - "External flush from a clean source"

+ - "Cyclone separator in the seal flush line"

+ - "External quench to the atmospheric side of the seal"

+ - "Barrier or buffer fluid system serving a dual seal"

+ - "No flush, dead-ended seal chamber"

+```

+### Where an external flush is furnished, the flush source, its pressure relative to seal chamber pressure, and its flow rate shall be stated on the submittal.

+### Where a cyclone separator is furnished, the separator's reject line shall be piped to the pump suction and shall not be valved closed.

+### Flush flow does two things at once: it carries face heat out of the seal chamber and it sweeps solids out before they reach the faces. Recirculating from the discharge does both adequately when the fluid itself is clean, and does the second one backwards when it is not, because discharge water in an open loop carries the same tower debris the seal is trying to avoid. {note}

+### A dead-ended seal chamber has no flow through it at all, so face heat leaves only by conduction. That is workable on small, cool, low-pressure duty and becomes the reason for a short seal life as any of those three conditions changes. {note}

+# Pump Motor {toc}

+## Motor Rating and Supply {toc}

+### The motor for each pump shall be rated as indicated in the datasheet and shall conform to NEMA MG 1.

+```datasheet

+label: Motor Nameplate Horsepower

+type: range

+unit: hp

+drawing_ref: "mechanical equipment schedule"

+options:

+ min: 0.25

+ max: 700

+ setpoints: [0.25, 0.33, 0.5, 0.75, 1, 1.5, 2, 3, 5, 7.5, 10, 15, 20, 25, 30, 40, 50, 60, 75, 100, 125, 150, 200, 250, 300, 350, 400, 500, 600, 700]

+default: deferred

+```

+```datasheet

+label: Motor Supply Voltage

+type: range

+unit: V

+drawing_ref: "electrical drawings and panel schedules"

+options:

+ min: 115

+ max: 4160

+ setpoints: [115, 208, 230, 460, 480, 575, 2300, 4160]

+default: deferred

+```

+```datasheet

+label: Motor Supply Phase

+type: radio

+drawing_ref: "electrical drawings and panel schedules"

+options:

+ - "Single phase, 1Φ"

+ - "Three phase, 3Φ"

+default: deferred

+```

+### Motor voltage and phase shall match the branch circuit serving the pump as shown on the electrical documents, and any discrepancy between the mechanical schedule and the electrical documents shall be resolved before the motor is released for fabrication.

+### Motors at or above 1 hp shall be three phase where three-phase power is available at the pump location.

+### Where three-phase power is not available at the pump location, single-phase motors shall be furnished only within the horsepower range for which the pump manufacturer offers single-phase construction.

+### Motor voltage is a fact about the building's electrical distribution rather than a property of the pump, which is why it defers to the electrical documents. The recurring coordination failure is a mechanical schedule that names a nominal utilization voltage while the panel schedule serving the pump carries another, and the mismatch is discovered when the motor arrives. {note}

+## Motor Enclosure {toc}

+### The motor enclosure shall be as indicated in the datasheet.

+```datasheet

+label: Motor Enclosure

+type: select

+options:

+ - "Totally enclosed fan cooled, TEFC"

+ - "Totally enclosed nonventilated, TENV"

+ - "Totally enclosed air over, TEAO"

+ - "Totally enclosed blower cooled, TEBC"

+ - "Open drip proof, ODP"

+ - "Weather protected type I, WP-I"

+ - "Explosionproof"

+default: "Totally enclosed fan cooled, TEFC"

+```

+### Where the motor is installed outdoors or in a space open to weather, the enclosure shall be rated for that exposure and the motor shall be furnished with a drain and breather at its low point.

+### Where the motor is installed in a classified location, the enclosure shall be listed for the class, division, and group established for that location under NFPA 70.

+### Open drip proof construction shall not be used where airborne moisture, dust, or corrosive vapor reaches the motor location.

+### A totally enclosed frame keeps the winding isolated from the room air and rejects heat through the frame surface, which is what lets the same motor sit in a dusty penthouse, a wet cooling tower deck, and a clean mechanical room. Open drip proof construction cools the winding with room air directly, so it runs cooler for the same frame size and admits whatever the room air carries. {note}

+### On a cooling tower deck the exposure is not only weather but drift: fine droplets of concentrated, chemically treated water carried out of the fill. That is a more aggressive environment than rain, and it is the reason motors in that position are specified with the enclosure and the winding treatment they are, rather than with an ordinary outdoor rating. {note}

+## Motor Efficiency {toc}

+### Motor efficiency shall be as indicated in the datasheet, and the guaranteed efficiency at full load shall be stated on the motor submittal.

+```datasheet

+label: Motor Efficiency Level

+type: radio

+options:

+ - "NEMA Premium efficiency per NEMA MG 1"

+ - "Super premium efficiency exceeding NEMA Premium"

+ - "NEMA energy efficient"

+default: "NEMA Premium efficiency per NEMA MG 1"

+```

+### Where the motor falls within the scope of federal minimum efficiency regulation, its nominal full-load efficiency shall be not less than the regulated minimum for its horsepower, enclosure, and pole count.

+### Motor efficiency at part load shall be stated for any motor served by a variable frequency drive, at 50 percent and 75 percent of rated load as well as at full load.

+### The efficiency step from energy-efficient to premium construction is a point or two at full load, and it is worth the most on a motor that runs at high load for most of the year — a primary chilled water pump or a condenser water pump in a continuously occupied building. On a pump that runs at 40 percent speed most of the time, the same step buys far less than the speed control itself already did. {note}

+## Inverter Duty and Shaft Currents {toc}

+### Where the motor is driven by a variable frequency drive, its insulation system rating shall be as indicated in the datasheet.

+```datasheet

+label: Motor Inverter-Duty Rating

+type: radio

+options:

+ - "Inverter duty per NEMA MG 1 Part 31"

+ - "Inverter capable per NEMA MG 1 Part 30"

+ - "Not applicable, motor is not driven by a variable frequency drive"

+```

+### A motor not rated for inverter duty shall not be connected to a variable frequency drive unless an output filter conforming to [[sync/hvac-variable-frequency-drives]] is provided and the motor manufacturer accepts the resulting waveform in writing.

+### Shaft current protection shall be provided as indicated in the datasheet.

+```datasheet

+label: Motor Shaft Current Protection

+type: radio

+options:

+ - "Insulated nondrive-end bearing"

+ - "Shaft grounding ring at the drive end"

+ - "Insulated nondrive-end bearing and shaft grounding ring"

+ - "None"

+```

+### Motor and drive grounding and bonding shall conform to [[sync/hvac-variable-frequency-drives]].

+### NEMA MG 1 Part 31 requires the insulation system of a motor rated 600 V or less to withstand 1,600 V peak at a rise time of 0.1 µs. That figure exists because a drive's switching edge reflects at the motor terminals and can arrive at nearly twice the bus voltage, and the length of the motor cable determines how much of that overshoot survives. {note}

+### The same fast switching edge drives a voltage between the rotor shaft and the frame. Where it exceeds roughly 300 mV peak, NEMA MG 1 Part 31 points toward interrupting the current path, and the two ways to do that are to insulate the bearing so the current cannot pass or to give it a lower-impedance route through a grounding ring. Doing only the first on a motor that also drives a metallic coupling can push the current through the pump bearings instead. {note}

+## Non-Overloading Selection and Service Factor {toc}

+### The motor service factor shall be as indicated in the datasheet.

+```datasheet

+label: Motor Service Factor

+type: range

+options:

+ min: 1.0

+ max: 1.25

+ setpoints: [1.0, 1.15, 1.25]

+default: 1.15

+```

+### The motor nameplate horsepower shall equal or exceed the pump brake horsepower at every point on the certified curve between shutoff and runout, evaluated at the density of the circulated fluid at its minimum operating temperature.

+### The service factor shall not be used as capacity in the non-overloading evaluation.

+### Where the motor is driven by a variable frequency drive, the motor current at the design point shall not exceed the nameplate full-load current.

+### Non-overloading selection against the full curve rather than against the design point is what protects the motor at runout, and runout is not a hypothetical: it is the condition on the first cold morning when every control valve is open, and the condition after a standby pump fails to start. On a rising power curve, brake horsepower at runout can exceed the design-point value by a third. {note}

+### Service factor is thermal headroom for a motor on a sinusoidal supply. A drive's switching waveform already consumes part of that headroom in additional winding and core heating, which is why the current at the design point is evaluated against the full-load rating rather than against the service-factor rating on a drive-fed motor. {note}

+# Baseplate, Coupling, and Isolation {toc}

+## Baseplate and Grouting {toc}

+### The baseplate for base-mounted pumps shall be as indicated in the datasheet, and shall be stiff enough that the pump-to-motor alignment holds under operating load and thermal growth.

+```datasheet

+label: Baseplate Type

+type: select

+options:

+ - "Fabricated steel baseplate"

+ - "Rigid steel baseplate with grout dam and machined mounting pads"

+ - "Stress-relieved steel baseplate with machined mounting pads"

+ - "Polymer concrete baseplate"

+ - "Structural steel frame without grout"

+ - "Not applicable, close-coupled or in-line pump"

+```

+### The baseplate shall be grouted as indicated in the datasheet.

+```datasheet

+label: Baseplate Grout

+type: radio

+options:

+ - "Nonshrink cementitious grout"

+ - "Epoxy grout"

+ - "Not applicable, ungrouted mounting"

+default: "Nonshrink cementitious grout"

+```

+### The underside of the baseplate shall be cleaned of rust, scale, and primer not compatible with the grout before grout is placed.

+### The baseplate shall be leveled and shimmed to the pump manufacturer's flatness tolerance before grouting, and the levelness shall be recorded before the grout is placed.

+### Grout shall be placed so that no voids remain beneath the baseplate, with vent holes at the high points of each grouted compartment.

+### Where the Engineer of Record and the Contractor disagree whether a grouted baseplate contains voids, the initial determination shall be made by the Engineer of Record, and the cost of any resulting investigation shall be borne by the Contractor where voids are found and by the Owner where they are not.

+### The baseplate's job is to hold two shafts collinear while one end of the assembly grows and the other does not. A void under the baseplate turns it into a beam supported at its ends, and the resulting flexure shows up as a vibration signature that reads exactly like a pump defect. More than one pump has been pulled and rebuilt to fix a hollow baseplate. {note}

+## Coupling and Guard {toc}

+### The coupling shall be of the type indicated in the datasheet, selected by the pump manufacturer for the motor torque, starting method, and the misalignment the installation can produce.

+```datasheet

+label: Coupling Type

+type: select

+options:

+ - "Elastomeric jaw coupling"

+ - "Elastomeric tire coupling"

+ - "Metallic disc coupling"

+ - "Grid coupling"

+ - "Rigid spacer coupling"

+ - "Direct drive, close coupled with no coupling"

+```

+### On frame-mounted and split-coupled pumps, the coupling shall include a spacer of sufficient length to permit removal of the seal without moving the motor.

+### A coupling guard conforming to OSHA 29 CFR 1910.219 shall be furnished with every pump having an exposed coupling.

+### The coupling guard shall be removable and replaceable without disturbing the pump or motor alignment.

+### An elastomeric element accommodates misalignment by deforming, so it also absorbs torque pulsation and isolates the two shafts electrically. It is a wear part, and its condition is the thing a coupling guard is opened to inspect. A metallic disc pack accommodates misalignment by flexing steel instead, with no wear part and no electrical isolation, and it fails abruptly rather than gradually when its misalignment limit is exceeded. {note}

+### The spacer is what turns a seal change from a motor-removal job into an afternoon. Without it, the motor comes off the baseplate and the alignment has to be re-established from scratch every time a seal is replaced. {note}

+## Vibration Isolation {toc}

+### Vibration isolation shall be as indicated in the datasheet.

+```datasheet

+label: Vibration Isolation

+type: select

+options:

+ - "Restrained spring isolators"

+ - "Freestanding spring isolators"

+ - "Concrete inertia base on spring isolators"

+ - "Elastomeric isolators"

+ - "Isolation pads"

+ - "Direct mounting on the housekeeping pad"

+```

+### Isolators shall be selected for a static deflection not less than the value indicated in the datasheet at the operating load of the assembly.

+```datasheet

+label: Minimum Isolator Static Deflection

+type: range

+unit: in.

+options:

+ min: 0.15

+ max: 3.5

+ setpoints: [0.15, 0.25, 0.5, 0.75, 1.0, 1.5, 2.5, 3.5]

+```

+### Where the pump is isolated, the piping connections at the pump shall be arranged so that the pump carries no piping weight, per [[sync/hydronic-piping]].

+### In-line pumps supported by the piping shall have pipe supports adjacent to the pump that carry the pump weight, and the pump shall not be supported as a cantilever on its suction and discharge runs.

+### Isolator selection is a comparison between the isolator's natural frequency and the pump's running frequency, and useful isolation only begins when the running frequency is several times the natural frequency. That is why the required deflection rises as the running speed falls, and why an isolator adequate under a 3550 RPM pump can transmit almost everything under an 1150 RPM pump of the same weight. {note}

+### An inertia base adds mass rather than compliance. The added mass lowers the natural frequency of the isolated assembly and reduces the motion the pump makes on its springs, which is what keeps a heavy pump from rocking on start and stop. {note}

+## Seismic Restraint {toc}

+### Seismic restraint shall be provided as indicated in the datasheet.

+```datasheet

+label: Seismic Restraint

+type: radio

+drawing_ref: "seismic design criteria as indicated on the structural drawings"

+options:

+ - "Required"

+ - "Not required"

+default: deferred

+```

+### Where seismic restraint is required, restraints shall be designed for the forces determined under ASCE/SEI 7 and the IBC using the seismic design category and component importance factor established by the Engineer of Record for the project.

+### Restraints shall permit the vibration isolators to function normally under operating conditions and shall limit motion during a seismic event so that attached piping, conduit, and the pump and motor are not damaged.

+### Restraint calculations and attachment details shall be prepared and stamped by a professional engineer registered in the project jurisdiction.

+### The seismic design category and the component importance factor are determined by the design team for the building as a whole, not chosen equipment by equipment, which is why this standard takes them as given rather than assigning them. The importance factor in particular follows from the building's risk category and from whether the system is designated as required to function after an event. {note}

+# Pump Instrumentation and Control Interface {toc}

+## Pressure Indication {toc}

+### Pressure indication at each pump shall be as indicated in the datasheet.

+```datasheet

+label: Pump Pressure Indication

+type: select

+options:

+ - "Compound suction gauge and discharge pressure gauge"

+ - "Single gauge on a valved manifold across the pump"

+ - "Differential pressure gauge across the pump"

+ - "Pressure transmitters reporting to the building automation system"

+ - "Local gauges and pressure transmitters"

+default: "Compound suction gauge and discharge pressure gauge"

+```

+### Gauges shall be liquid filled and shall be provided with an isolation valve at each connection.

+### Gauge range shall be selected so that the design operating pressure falls between one third and two thirds of full scale.

+### Discharge pressure indication shall be taken between the pump discharge and the check valve so that the pump's own discharge pressure can be read while the pump runs.

+### The difference between the suction and discharge readings is the pump's actual total dynamic head, and comparing it against the certified curve at the measured flow is the only field diagnostic that distinguishes a pump problem from a system problem. Taking the discharge reading downstream of the check valve destroys that diagnostic, because a partially open or fouled check valve then hides inside the number. {note}

+## Motor Starting {toc}

+### The starting method for constant-speed pump motors shall be as indicated in the datasheet.

+```datasheet

+label: Constant-Speed Motor Starting Method

+type: select

+options:

+ - "Full voltage across the line"

+ - "Solid state soft starter"

+ - "Autotransformer reduced voltage starter"

+ - "Wye delta starter"

+ - "Part winding starter"

+ - "Not applicable, motor driven by a variable frequency drive"

+```

+### Motor branch circuit protection, disconnecting means, and overload protection shall conform to NFPA 70 Article 430.

+### Where a reduced-voltage or soft starting method is indicated, the starter shall develop sufficient torque at the reduced voltage to accelerate the pump to full speed against a filled system within the starter's transition time.

+### Reduced-voltage starting is specified to limit inrush where the supply cannot absorb it or where repeated across-the-line starts are objectionable, and it is only useful on a load that will accelerate at reduced torque. A centrifugal pump started against an open discharge is such a load; the same pump started against a closed valve and a full static column is not always. {note}

+## Building Automation Interface {toc}

+### The pump points listed in the datasheet shall be provided and shall be integrated per [[sync/building-automation-system]].

+```datasheet

+label: Pump Points at the Building Automation System

+type: checkbox

+options:

+ - "Run status by differential pressure or flow switch"

+ - "Run command"

+ - "Fault or trip alarm"

+ - "Discharge pressure transmitter"

+ - "Suction pressure transmitter"

+ - "Differential pressure across the pump"

+ - "Flow, where a flow meter is installed"

+ - "Motor speed feedback"

+ - "Seal leakage detection"

+ - "Bearing temperature"

+ - "Lead and lag designation and rotation"

+default:

+ - "Run status by differential pressure or flow switch"

+ - "Run command"

+ - "Fault or trip alarm"

+ - "Lead and lag designation and rotation"

+```

+### Where the pump is driven by a variable frequency drive, the points the drive itself reports shall be taken from [[sync/hvac-variable-frequency-drives]], and only the points listed above that the drive does not report shall be added at the pump.

+### Run status shall be proven hydraulically rather than electrically.

+### A current switch on the motor leads proves that the motor is turning, which is not the question the control system is asking. A deadheaded pump with a closed discharge valve, an airbound casing, or a sheared coupling all draw current and produce no flow, and every one of them reports as running. {note}

+# Factory Testing {toc}

+## Hydrostatic and Mechanical Run Tests {toc}

+### Each pump casing shall be hydrostatically tested by the manufacturer before shipment, with no leakage through castings, joints, or welds.

+### Each assembled pump and motor shall be given a mechanical run test at the factory, verifying direction of rotation, freedom from abnormal noise, and bearing housing vibration within the manufacturer's factory acceptance limits.

+### Factory test documentation shall be furnished as indicated in the datasheet.

+```datasheet

+label: Factory Test Documentation Required

+type: checkbox

+options:

+ - "Hydrostatic test certificate"

+ - "Mechanical run test report"

+ - "Certified performance curve from production testing"

+ - "Witnessed performance test report per ANSI/HI 14.6"

+ - "Material certificates for casing and impeller"

+ - "Impeller balance record"

+default:

+ - "Hydrostatic test certificate"

+ - "Mechanical run test report"

+ - "Certified performance curve from production testing"

+```

+## Hydraulic Performance Acceptance Test {toc}

+### Where a hydraulic performance acceptance test is required for a pump tag, the test shall be conducted per ANSI/HI 14.6 to the acceptance grade indicated in the datasheet.

+```datasheet

+label: Hydraulic Performance Acceptance Grade per ANSI/HI 14.6

+type: select

+options:

+ - "Grade 1B"

+ - "Grade 1E"

+ - "Grade 1U"

+ - "Grade 2B"

+ - "Grade 2U"

+ - "Grade 3B"

+```

+### Where the datasheet indicates no acceptance grade, the pump manufacturer shall state on the submitted curve the acceptance grade on which its published tolerances are based.

+### The test report shall state the measured flow, head, input power, and efficiency at each duty point tested, together with the tolerance band applied.

+### Where a tested pump falls outside the tolerance band of the specified grade, the manufacturer shall correct or replace the pump and retest it, and the cost of the retest shall be borne by the manufacturer.

+### The grade number sets how wide the tolerance band is and the letter sets how it is placed. Grade 1 bands are the tightest and Grade 3 the widest; a B suffix puts the band symmetrically around the guarantee, a U suffix removes the negative half so the pump can exceed the guarantee but never fall below it, and the E suffix is the bilateral grade written for cases where efficiency is the quantity being guaranteed. {note}

+### For a Grade 1 test the flow band runs ±5 percent bilateral or 0 to +10 percent unilateral, and head ±3 percent or 0 to +6 percent. Grade 2 roughly doubles both. The practical consequence is that a unilateral grade shifts all of the selection risk onto the manufacturer, and its price reflects that. {note}

+## Test Witnessing {toc}

+### Witnessing of the hydraulic performance acceptance test shall be as indicated in the datasheet.

+```datasheet

+label: Performance Test Witnessing

+type: radio

+options:

+ - "Not witnessed, certified test report submitted"

+ - "Witnessed at the test facility by the Engineer of Record"

+ - "Witnessed at the test facility by the Owner's representative"

+ - "Witnessed remotely by live video"

+default: "Not witnessed, certified test report submitted"

+```

+### Where witnessing is required, the Contractor shall give not less than fifteen business days written notice of the scheduled test and shall submit the duty points to be verified with that notice.

+### Where a witnessed test is postponed by the manufacturer after notice has been given, the manufacturer shall bear the witnesses' rescheduling costs.

+### Witnessing is bought for two reasons that have nothing to do with distrust: it puts the design team in the room when a pump misses, where the conversation about trim and tolerance happens in minutes instead of weeks, and it produces a test the Owner can point to. It costs travel time and factory scheduling, which is why it concentrates on large pumps, on tight head-capacity envelopes, and on plants that cannot be taken out of service to correct a bad selection. {note}

+# Field Testing and Startup {toc}

+## Pre-Startup Verification {toc}

+### The Contractor shall verify that pump and motor nameplate data match the approved submittal for that pump tag before the pump is started.

+### The Contractor shall verify that the suction piping arrangement as installed matches the approved coordination drawing.

+### The Contractor shall verify direction of rotation with the coupling disconnected or with the pump uncoupled from the motor.

+### The Contractor shall verify that the loop has been filled, vented, flushed, and released for pump operation by the party responsible under [[sync/hvac-water-treatment]].

+### The Contractor shall verify that suction strainers are clean and that any temporary startup strainer is removed or replaced before the pump is placed in service.

+### The Contractor shall record cold coupling alignment readings before the first start.

+### Bumping the motor with the coupling connected to check rotation drives the pump backward against a full system, which loosens a threaded impeller and can unscrew it into the casing. The half hour spent disconnecting the coupling is insurance against a rebuild. {note}

+### A temporary startup strainer left in place is one of the more common causes of a first-summer cavitation complaint, because it collects construction debris steadily and nothing on the control system reports the rising suction loss. {note}

+## Startup and Functional Testing {toc}

+### The Contractor shall start each pump and record suction pressure, discharge pressure, motor voltage, motor current, and flow at the design condition.

+### The Contractor shall calculate total dynamic head from the recorded pressures and shall plot the operating point against the certified curve at the measured flow.

+### Where the measured operating point falls outside the tolerance band of the certified curve, the Contractor shall notify the Engineer of Record and shall not proceed to balancing until the discrepancy is resolved.

+### For variable-speed pumps, the Contractor shall operate the pump at minimum speed, at intermediate speeds, and at design speed, and shall identify any speed at which resonance occurs.

+### Where resonance is identified, skip-frequency bands shall be programmed in the drive per [[sync/hvac-variable-frequency-drives]] and the bands shall be recorded in the startup report.

+### The Contractor shall coordinate with the balancing agency per [[sync/testing-adjusting-and-balancing]] to confirm system flow at the pump design condition.

+### The Contractor shall exercise each building automation point at the pump and shall verify the reported value against the field measurement.

+### A measured point that lands to the right of the certified curve almost always means the system is less resistant than calculated rather than that the pump is over-performing, and the correction is usually an impeller trim rather than a throttled valve left permanently closed. A throttled valve burns the same energy every hour for the life of the building. {note}

+## Coupling Alignment Verification {toc}

+### Coupling alignment shall be verified by the method indicated in the datasheet.

+```datasheet

+label: Coupling Alignment Method

+type: radio

+options:

+ - "Laser alignment"

+ - "Reverse dial indicator"

+ - "Rim and face dial indicator"

+```

+### Straightedge and feeler-gauge alignment shall not be used as the final alignment method on any pump at or above 5 hp.

+### Alignment shall be verified cold, and shall be verified again after the pump has run long enough for the casing and the motor to reach stable operating temperature.

+### Final alignment after thermal stabilization shall be within the tolerance indicated in the datasheet.

+```datasheet

+label: Maximum Coupling Misalignment After Thermal Stabilization

+type: range

+unit: mils

+options:

+ min: 1

+ max: 10

+ setpoints: [1, 2, 3, 4, 5, 7, 10]

+```

+### Where the datasheet indicates no alignment tolerance, the coupling manufacturer's published tolerance for the coupling furnished shall govern, and the published value shall be recorded in the startup report alongside the readings taken.

+### Both sets of readings, and the thermal offset applied at cold alignment, shall be recorded in the field startup report.

+### Alignment is the installation activity that most often decides how long the seal and the bearings last, and heating water pumps make it harder than the rest: the casing grows several thousandths of an inch as it comes up to temperature while the motor barely moves, so a joint aligned perfectly cold is misaligned hot. The cure is to align cold deliberately off-center by the growth the manufacturer predicts, then confirm the prediction with hot readings. {note}

+## Field Vibration Acceptance {toc}

+### Bearing housing vibration shall be measured at each pump and motor bearing after the pump has reached stable operating temperature.

+### Measured vibration shall not exceed the allowable values on the basis indicated in the datasheet.

+```datasheet

+label: Field Vibration Acceptance Basis

+type: radio

+options:

+ - "ANSI/HI 9.6.4 field test allowable values"

+ - "ANSI/HI 9.6.4 factory test allowable values"

+ - "Coupling and pump manufacturers' published field acceptance limits"

+default: "ANSI/HI 9.6.4 field test allowable values"

+```

+### For variable-speed pumps, vibration shall be measured at minimum speed, at an intermediate speed, and at design speed.

+### Where measured vibration exceeds the allowable value, the Contractor shall determine the cause and correct it, and the cost of the corrective work and of any retest shall be borne by the Contractor unless the cause is shown to originate outside the Contractor's scope.

+### The measurements taken at acceptance become the baseline every later measurement is compared against, and their value depends entirely on the measurement points and the operating condition being recorded well enough to repeat. A vibration reading with no speed and no flow recorded alongside it is not a baseline. {note}

+### ANSI/HI 9.6.4 sets different allowable values for a factory test and a field installation, because a pump on a factory stand sits on a stiff, isolated foundation and a pump in a building sits on whatever it was set on. Applying the factory values in the field is a legitimate tightening of the requirement, and it is a requirement the installation as designed has to be capable of meeting. {note}

+# Installation {toc}

+## Setting and Anchoring {toc}

+### Pumps shall be set in the locations and orientations [[drawing: pump locations as indicated on the mechanical plans]].

+### Base-mounted pumps shall be set on housekeeping pads detailed [[drawing: housekeeping pad details as indicated on the contract documents]].

+### Housekeeping pads shall extend not less than 4 in. beyond the baseplate footprint on all sides and shall stand not less than 4 in. above the surrounding finished floor.

+### Anchor bolts shall be sized and embedded for the operating loads and, where seismic restraint is required, for the seismic loads determined under ASCE/SEI 7.

+### Post-installed anchors shall be qualified for the substrate and for cracked concrete where the design requires it.

+### Clearance shall be maintained at each pump for removal of the impeller and the motor, and for access to the seal, the bearings, and the grease or oil fittings.

+### The raised housekeeping pad does more than dress the installation: it keeps the baseplate above the water that reaches a mechanical room floor from a relief valve, a coil drain, or a wash-down, and it gives the grout an edge to be finished against. {note}

+## Suction Piping {toc}

+### Suction piping shall provide a straight, uninterrupted run immediately upstream of the pump suction connection of not less than the length indicated in the datasheet, expressed in suction pipe diameters.

+```datasheet

+label: Minimum Straight Suction Pipe Run

+type: range

+unit: pipe diameters

+options:

+ min: 3

+ max: 20

+ setpoints: [3, 5, 8, 10, 15, 20]

+default: 5

+```

+### Where the straight run indicated cannot be achieved, flow conditioning shall be provided as indicated in the datasheet and the pump manufacturer shall confirm in writing that the arrangement is acceptable for the pump furnished.

+```datasheet

+label: Suction Flow Conditioning

+type: radio

+options:

+ - "None, straight pipe run only"

+ - "Suction diffuser at the pump suction connection"

+ - "Straightening vanes in the suction pipe"

+ - "Long radius elbow oriented in the plane of the shaft"

+```

+### Reducers on horizontal suction runs shall be eccentric and shall be installed flat side up.

+### Suction piping shall be arranged so that no high point can trap air between the system's air separation point and the pump suction.

+### Strainers, valves, and specialties in the suction piping shall conform to [[sync/hydronic-piping]].

+### An elbow close to the suction connection delivers water to the impeller eye with a swirl and an uneven velocity profile, which loads the vanes unequally once per revolution. On a double-suction pump the same elbow feeds the two halves of the impeller differently and produces an axial thrust the bearings were not sized for. {note}

+### A concentric reducer on a horizontal run makes an air trap at its top by construction, and the pocket it holds is released into the impeller in slugs. The eccentric reducer installed flat side up removes the pocket; installed flat side down, it makes a worse one. {note}

+## Discharge Piping {toc}

+### A check valve shall be installed in the discharge piping of each pump that operates in parallel with another pump or that can be subjected to reverse flow.

+### An isolation valve shall be installed downstream of the check valve at each pump.

+### Check valve type, closing characteristic, and orientation shall conform to [[sync/hydronic-piping]].

+### Discharge piping shall be supported so that no piping weight or thermal load is carried by the pump connections.

+### The isolation valve downstream of the check valve is what allows the check valve itself to be serviced without draining the system, and it is the valve most often omitted on the assumption that the check valve will never need attention. {note}

+## Vertical Turbine Pumps in Sumps {toc}

+### Where the supply water level is below the pump, vertical turbine construction shall be used, and self-priming horizontal pumps with foot valves shall not be used.

+### The vertical turbine discharge head shall be supported at the sump deck and shall be designed for the weight and operating thrust of the column, line shaft, bowls, and impellers below it.

+### The bowl assembly shall be set at a depth that maintains submergence not less than the value indicated in the datasheet at the minimum operating water level and the maximum flow.

+```datasheet

+label: Minimum Submergence Above the Suction Bell

+type: range

+unit: in.

+options:

+ min: 6

+ max: 72

+ setpoints: [6, 12, 18, 24, 36, 48, 60, 72]

+```

+### Required submergence shall be determined per ANSI/HI 9.8 for the bell diameter and inlet velocity of the pump furnished, and the calculated value shall be submitted with the pump.

+### Where the sump geometry cannot provide the required submergence, a vortex suppression device or an intake modification conforming to ANSI/HI 9.8 shall be provided, and the modification shall be submitted for review before fabrication.

+### Motors on cooling tower decks shall be positioned so that they are not in the path of drift or splash from the tower fill.

+### ANSI/HI 9.8 sets required submergence from the inlet bell Froude number rather than from a fixed dimension, in the form S/D = 1.0 + 2.3 F, where F is the Froude number at the bell. Submergence therefore rises with inlet velocity, which is why a sump that is adequate at part flow can pull an air core at full flow. {note}

+### An air-entraining vortex costs head and capacity immediately and damages the first-stage impeller over time, and it usually announces itself as a pump that performs to curve in the morning and falls off in the afternoon, when the tower basin level drops. {note}

+## Open-Loop Water Management {toc}

+### The pump installation shall not create low points or dead legs in the suction piping that retain water when the system is drained.

+### Pumps in open-loop service that will stand idle between seasons shall be drained through the casing drain and shall be returned to service in accordance with the building water management program under [[sync/hvac-water-treatment]].

+### The Contractor shall provide the pump-side information the building water management program requires under ANSI/ASHRAE 188, including casing volumes, drain point locations, and idle-period procedures.

+### Water that sits still in a pump casing or a dead leg between seasons is the condition Legionella colonization needs, and it is created by installation geometry rather than by anything in the pump itself. The pump-side contribution to the water management program is mostly a matter of eliminating trapped volumes and documenting the ones that cannot be eliminated. {note}

+# Delivery, Storage, and Handling {toc}

+## Packaging and Protection {toc}

+### Pumps shall be shipped with all openings closed by the manufacturer's protective covers, and the covers shall remain in place until the connecting piping is ready to be made up.

+### Shipments shall be inspected for damage on arrival, and damage shall be photographed and reported to the manufacturer before the shipment is accepted.

+### Rotating elements shall be secured for shipment where the manufacturer's instructions require it, and any shipping restraint shall be removed before the pump is rotated.

+## Storage {toc}

+### Pumps shall be stored indoors in a clean, dry, ventilated location.

+### Storage requirements shall follow the expected storage duration indicated in the datasheet.

+```datasheet

+label: Storage Duration Before Installation

+type: radio

+options:

+ - "Less than three months"

+ - "Three to twelve months"

+ - "More than twelve months"

+default: "Less than three months"

+```

+### Where storage will exceed three months, the pump manufacturer's extended storage procedure shall be obtained and followed, and the storage log shall record each action taken.

+### Where storage will exceed three months, shafts shall be rotated by hand at intervals not exceeding one month, and the rotation shall be logged.

+### Motor space heaters, where furnished, shall be energized during storage in any location where condensation can occur.

+### A shaft left in one position for months lets the bearing rollers press flats into the races and lets the seal faces bond to each other where the film has dried out. Both damage modes are invisible at installation and appear as a vibration or a leak within weeks of startup. {note}

+## Rigging and Lifting {toc}

+### Rigging shall use only the lifting points the manufacturer designates for the assembly.

+### The manufacturer's rigging instructions shall be present at the point of rigging and shall be reviewed before the lift.

+### Motor lifting eyes shall not be used to lift an assembled pump, and slings shall not be passed around the pump casing or the piping connections.

+### A motor eyebolt is rated for the motor, and using it to pick up the whole assembly loads it several times over its rating while swinging the baseplate below it. Slings around a casing crush the machined faces and can bend the shaft through the impeller. {note}

+# Warranty {toc}

+## Warranty Period and Coverage {toc}

+### Each pump shall be warranted against defects in materials and workmanship for the period indicated in the datasheet.

+```datasheet

+label: Warranty Period

+type: range

+unit: years

+options:

+ min: 1

+ max: 5

+ setpoints: [1, 2, 3, 5]

+default: 1

+```

+### The warranty period shall begin on the date indicated in the datasheet.

+```datasheet

+label: Warranty Commencement

+type: radio

+options:

+ - "Date of substantial completion"

+ - "Date of beneficial use by the Owner"

+ - "Date of startup"

+ - "Date of delivery to the site"

+default: "Date of substantial completion"

+```

+### The mechanical seal shall be warranted for the period indicated in the datasheet, measured from the same commencement date as the pump warranty.

+```datasheet

+label: Mechanical Seal Warranty Period

+type: range

+unit: years

+options:

+ min: 1

+ max: 5

+ setpoints: [1, 2, 3, 5]

+```

+### Warranty coverage shall include the items indicated in the datasheet.

+```datasheet

+label: Warranty Coverage

+type: checkbox

+options:

+ - "Replacement parts"

+ - "On-site labor for repair or replacement"

+ - "Removal and reinstallation of the pump or motor"

+ - "Freight both ways on returned components"

+ - "Annual preventive maintenance visit"

+ - "Next business day on-site response"

+default:

+ - "Replacement parts"

+ - "On-site labor for repair or replacement"

+```

+### Where the datasheet indicates no mechanical seal warranty period, the seal shall carry the same warranty period as the pump.

+## Repair and Re-Warranty {toc}

+### A component repaired or replaced under warranty shall carry a new warranty running for the full original period from the date the repair is completed, or for the remainder of the original period, whichever ends later.

+### The manufacturer shall bear the cost of collateral damage caused by a warranted failure or by the warranty repair itself, including damage to the pump, motor, coupling, baseplate, and directly connected piping.

+### Where the Engineer of Record and the manufacturer disagree whether a failure is covered, the initial determination shall be made by the Engineer of Record.

+### A re-warranty written as the remainder of the original term shrinks toward nothing as the term runs out, so a seal replaced in the eleventh month of a twelve-month warranty would carry one month of coverage. Restarting the full term from the repair date removes that. {note}

+## Warranty Exclusions {toc}

+### Warranty coverage shall not extend to damage caused by installation contrary to the manufacturer's published instructions.

+### Warranty coverage shall not extend to damage caused by operation outside the allowable operating region, by dry running, or by operation against a closed discharge valve beyond the time the manufacturer permits.

+### Warranty coverage shall not extend to damage caused by water chemistry outside the limits established under [[sync/hvac-water-treatment]], provided the manufacturer states those limits in the submittal.

+### Warranty coverage shall not extend to damage caused by service conditions materially different from those stated at the time of selection.

+### An exclusion for water chemistry is only enforceable if the manufacturer published its limits where the Owner could see them, which is why this standard conditions the exclusion on those limits appearing in the submittal rather than surfacing after a failure. {note}

+# Spare Parts {toc}

+## Spare Parts Furnished {toc}

+### The spare parts indicated in the datasheet shall be furnished at substantial completion.

+```datasheet

+label: Spare Parts Furnished

+type: checkbox

+options:

+ - "One mechanical seal assembly for each pump model installed"

+ - "One set of shaft sleeves for each pump model installed"

+ - "One set of wear rings for each pump model installed"

+ - "One coupling element for each coupling installed"

+ - "One set of casing and seal gaskets for each pump model installed"

+ - "One set of bearings for each pump model installed"

+ - "One impeller for each pump model installed"

+ - "One complete pump assembly of the most numerous size on the project"

+default:

+ - "One mechanical seal assembly for each pump model installed"

+ - "One coupling element for each coupling installed"

+ - "One set of casing and seal gaskets for each pump model installed"

+```

+### Spare parts shall be packaged for long-term storage and shall be labeled with the pump tags they serve, the pump model, and the manufacturer's part number.

+### Spare parts shall be delivered to the Owner and receipted, and the receipt shall be included in the closeout submittal.

+### The seal is the part that fails first and most often, and a spare of the correct face and elastomer combination on the shelf is the difference between an afternoon outage and a week of waiting on a seal that has to be built to order. Cartridge seals in particular are frequently not stocked by distributors in the exact configuration a given pump uses. {note}

+## Maintenance Documentation and Tools {toc}

+### The documentation and tools indicated in the datasheet shall be furnished with the pumps.

+```datasheet

+label: Maintenance Documentation and Tools

+type: checkbox

+options:

+ - "Installation, operation, and maintenance manual per ANSI/HI 1.4"

+ - "Preventive maintenance schedule with intervals"

+ - "Bearing lubrication chart naming grease type, quantity, and interval"

+ - "Seal installation instructions and setting dimensions"

+ - "Model-specific service tools such as impeller pullers and seal fixtures"

+ - "Spare parts ordering guide with manufacturer part numbers"

+ - "Certified dimensional drawing for each pump model"

+default:

+ - "Installation, operation, and maintenance manual per ANSI/HI 1.4"

+ - "Preventive maintenance schedule with intervals"

+ - "Bearing lubrication chart naming grease type, quantity, and interval"

+ - "Spare parts ordering guide with manufacturer part numbers"

+```

+### The certified curve for each pump tag, marked with the as-installed impeller diameter and the measured startup operating point, shall be placed in the operation and maintenance manual.

+### The curve with the startup point marked on it is the single most useful page in the manual, because every future troubleshooting question about the pump is answered by comparing a new measurement against that mark. {note}

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