Corpus sync: neutrality remakes, note hygiene, datasheet relocation, transformer-split cross-refs
---
title: Packaged Pump and Lift Stations
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assemblies that lift raw sewage, screened effluent, or stormwater where gravity
outfall is unavailable on commercial, institutional, light-industrial, and
− multi-family sites. Covers the complete packaged unit -- wet well basin,
+ multi-family sites. Covers the complete packaged unit — wet well basin,
submersible or dry-pit pumps, discharge piping, valve vault, level controls,
NEMA 4X control panel with duty/standby logic, alarms, ventilation, and the
− standby-power interface -- in simplex, duplex, and triplex/quadruplex
+ standby-power interface — in simplex, duplex, and triplex/quadruplex
configurations, for new construction and lift-station replacement, from the
influent gravity connection to the force main discharge point.
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## Station Configuration {toc}
−### The packaged station configuration shall be selected to match the design flow and the redundancy required by the Authority Having Jurisdiction. {note}
+### The packaged station configuration shall be selected to match the design flow and the redundancy required by the Authority Having Jurisdiction.
### Configuration is the first decision because it cascades into basin size, panel logic, and the standby-power interface. A simplex station has no redundancy and is limited to small, low-consequence service; duplex (one duty, one standby, alternating) is the default for commercial and institutional service; triplex and larger stations serve campus and industrial flows with lead/lag/standby logic. {note}
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type: radio
options:
− - Simplex (single pump, no standby) -- small commercial / residential only
+ - Simplex (single pump, no standby) — small commercial / residential only
- Duplex (duty/standby, alternating)
- Triplex (lead/lag/standby)
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```
−### Submersible pumps in a packaged basin are the default for site lift stations; dry-pit configurations shall be used only where the design head, flow, or maintenance requirements justify the larger above-grade structure. {note}
+### Submersible pumps in a packaged basin are the default for site lift stations; dry-pit configurations shall be used only where the design head, flow, or maintenance requirements justify the larger above-grade structure.
# Referenced Standards {toc}
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|----------|-------|
| ANSI/HI 9.8-2018 | Rotodynamic Pumps for Pump Intake Design |
−| ANSI/HI 1.1-1.2 | Rotodynamic (Centrifugal) Pumps -- Nomenclature and Definitions |
+| 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 Installation, Operation, and Maintenance |
−| ANSI/HI 11.6 | Rotodynamic Submersible Pumps -- Hydraulic, Hydrostatic, Mechanical, and Electrical Acceptance Tests |
+| ANSI/HI 11.6 | Rotodynamic Submersible Pumps — Hydraulic, Hydrostatic, Mechanical, and Electrical Acceptance Tests |
| NFPA 820 | Standard for Fire Protection in Wastewater Treatment and Collection Facilities |
| NFPA 70 (NEC) | National Electrical Code (Articles 430, 501, 700/701) |
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| ASTM C443 | Joints for Concrete Pipe and Manholes Using Rubber Gaskets |
| ASTM F714 | Polyethylene (PE) Plastic Pipe (DR-PR) Based on Outside Diameter |
−| AASHTO HS-20 (H-20) | Standard Specification for Highway Bridges -- H-20 Traffic Loading |
+| AASHTO HS-20 (H-20) | Standard Specification for Highway Bridges — H-20 Traffic Loading |
| NEMA MG 1 | Motors and Generators |
−| IPC Chapter 7 / Section 712 | International Plumbing Code -- Sumps and Ejectors |
−| IAPMO/UPC Chapter 7 | Uniform Plumbing Code -- Sanitary Drainage Systems |
+| IPC Chapter 7 / Section 712 | International Plumbing Code — Sumps and Ejectors |
+| IAPMO/UPC Chapter 7 | Uniform Plumbing Code — Sanitary Drainage Systems |
| 10 States Standards | Recommended Standards for Wastewater Facilities (GLUMRB) |
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# Quality Assurance {toc}
−## The station shall be furnished by a single manufacturer that is responsible for the complete packaged assembly, including the basin, pumps, valve vault, controls, and their coordinated performance. {note}
+## The station shall be furnished by a single manufacturer that is responsible for the complete packaged assembly, including the basin, pumps, valve vault, controls, and their coordinated performance.
## Single-source responsibility prevents the split-scope failures that occur when basin, pumps, and panel are procured separately and no party owns the interfaces between them. {note}
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## Welding on steel structures and steel discharge piping shall be performed by welders qualified under a recognized procedure.
−## The manufacturer shall hold a pre-installation conference with the installing contractor to coordinate basin setting, anti-flotation, electrical service, and the standby-power interface. {note}
+## The manufacturer shall hold a pre-installation conference with the installing contractor to coordinate basin setting, anti-flotation, electrical service, and the standby-power interface.
# Environmental and Service Conditions {toc}
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### The wet well interior and the space within 1 ft of every opening are Class I, Division 1; the space extending 3 ft to 5 ft around openings at grade is Class I, Division 2. This is the single most commonly omitted life-safety requirement in pump station specifications, and omitting it produces field RFIs and rework. {note}
−### All electrical equipment located within the Class I, Division 1 wet well -- including level sensors, junction boxes, and conduit -- shall be explosion-proof or intrinsically safe and shall be installed with listed conduit seals at the boundary.
+### All electrical equipment located within the Class I, Division 1 wet well — including level sensors, junction boxes, and conduit — shall be explosion-proof or intrinsically safe and shall be installed with listed conduit seals at the boundary.
### Electrical equipment within the Class I, Division 2 zone around openings shall be rated for that classification.
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## Ventilation {toc}
−### Classified wet wells shall be continuously force-ventilated to reduce the extent of the hazardous area and to limit hydrogen sulfide accumulation. {note}
+### Classified wet wells shall be continuously force-ventilated to reduce the extent of the hazardous area and to limit hydrogen sulfide accumulation.
−### Hydrogen sulfide is heavier than air and settles at the wet well floor; exhaust intake must therefore be drawn from the floor level, not the top of the basin. {note}
+### Hydrogen sulfide is heavier than air and settles at the wet well floor; exhaust intake must therefore be drawn from the floor level, not the top of the basin.
### Continuous ventilation shall provide not less than 30 air changes per hour, or 6 air changes per hour continuous plus 30 air changes per hour when the space is entered, in accordance with NFPA 820 and the 10 States Standards.
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## Corrosion Protection {toc}
−### Raw sewage wet wells generate hydrogen sulfide that attacks concrete and steel; the wet well interior shall be protected against sulfide corrosion. {note}
+### Raw sewage wet wells generate hydrogen sulfide that attacks concrete and steel; the wet well interior shall be protected against sulfide corrosion.
### Unlined concrete wet wells in raw sewage service deteriorate within five to ten years. Fiberglass and HDPE basins are inherently resistant; concrete basins require a protective lining. {note}
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## Basin Material {toc}
−### The wet well basin material shall be selected for the service, depth, groundwater condition, and traffic loading of the installation. {note}
+### The wet well basin material shall be selected for the service, depth, groundwater condition, and traffic loading of the installation.
### Fiberglass (ASTM D3753) is the most common packaged-unit basin and resists sulfide corrosion inherently. HDPE (ASTM F714) suits high-groundwater sites. Precast concrete (ASTM C478) suits large-diameter wet wells but requires a protective lining in sewage service. {note}
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## Anti-Flotation and Structure {toc}
−### The basin shall be designed and ballasted to resist flotation under the maximum credible groundwater level with the wet well empty. {note}
+### The basin shall be designed and ballasted to resist flotation under the maximum credible groundwater level with the wet well empty.
### A buried empty basin is buoyant; a flotation collar, anti-flotation ballast, or structural anchorage sized to the local water table prevents the basin from lifting out of the ground. {note}
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### Where the station is located in a paved area, a driveway, or any area where vehicle access is possible, all basin top slabs, covers, and access hatches shall be rated for AASHTO H-20 traffic loading.
−### Standard fiberglass basins are not H-20 rated by default; the traffic-rated cover and reinforced basin shall be specified explicitly where required. {note}
+### Standard fiberglass basins are not H-20 rated by default; the traffic-rated cover and reinforced basin shall be specified explicitly where required.
```datasheet
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−## Access {toc}
+## Access hatches shall be sized to allow removal of each pump on its guide rail without entering the wet well.
−### Access hatches shall be sized to allow removal of each pump on its guide rail without entering the wet well.
+## Access hatches over a classified wet well shall be gasketed and lockable and shall be coordinated with the hazardous-area boundary.
−### Access hatches over a classified wet well shall be gasketed and lockable and shall be coordinated with the hazardous-area boundary. {note}
+## Hatch material shall be aluminum or stainless steel selected for the corrosive wet well environment.
−### Hatch material shall be aluminum or stainless steel selected for the corrosive wet well environment.
−
# Pumps and Hydraulic Design {toc}
## Firm Capacity {toc}
−### The station shall provide firm pumping capacity: with the largest pump out of service, the remaining pump or pumps shall convey the design peak hourly flow. {note}
+### The station shall provide firm pumping capacity: with the largest pump out of service, the remaining pump or pumps shall convey the design peak hourly flow.
### This is the governing rule of the 10 States Standards and of most state AHJs. A station sized only at total installed capacity, without checking firm capacity, will be rejected at permit review or redesigned after bid. {note}
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## Wet Well Volume and Cycling {toc}
−### The active wet well volume shall be sized to limit pump starts so that motors are not damaged by short cycling. {note}
+### The active wet well volume shall be sized to limit pump starts so that motors are not damaged by short cycling.
### Excessive cycling overheats motors and fails seals prematurely. The active storage between the pump-on and pump-off levels sets the minimum cycle time. The 10 States Standards limit starts to about 6 per hour for motors above 10 HP and about 12 per hour for smaller motors. The active volume in gallons is approximately V = Q / (4 N), where Q is the single-pump flow in gpm and N is the maximum starts per hour for one pump. {note}
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−### Single-phase 120/240V supply shall be used only for simplex stations with motors not exceeding 2 HP; motors above 20 HP shall be 480V 3Φ. {note}
+### Single-phase 120/240V supply shall be used only for simplex stations with motors not exceeding 2 HP; motors above 20 HP shall be 480V 3Φ.
# Discharge Piping and Valve Vault {toc}
−## Each pump discharge shall be provided with a check valve and an isolation valve located in an accessible dry valve vault, not submerged in the wet well. {note}
+## Each pump discharge shall be provided with a check valve and an isolation valve located in an accessible dry valve vault, not submerged in the wet well.
## Submerging valves in the wet well makes them unmaintainable and exposes them to sulfide corrosion and rag fouling. A separate dry valve vault is required so that valves can be inspected and serviced without entering the classified wet well. {note}
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## Force Main Connection {toc}
−### The force main connection shall be a flanged or restrained-joint termination at the station discharge, delivered to the limit of this standard's scope. {note}
+### The force main connection shall be a flanged or restrained-joint termination at the station discharge, delivered to the limit of this standard's scope.
−### The discharge force main shall be sized so that the velocity is not less than 2.0 fps at average daily flow for self-cleaning and not more than 10 fps to limit water hammer. {note}
+### The discharge force main shall be sized so that the velocity is not less than 2.0 fps at average daily flow for self-cleaning and not more than 10 fps to limit water hammer.
### Velocity must be checked at average daily flow, not only at peak. An oversized force main that cannot reach 2 fps at average flow accumulates solids, grease, and sulfide, causing odor complaints and pipe corrosion. {note}
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# Level Controls {toc}
−## The level-control technology shall be selected for the reliability the service demands, not for lowest first cost. {note}
+## The level-control technology shall be selected for the reliability the service demands, not for lowest first cost.
## Tethered float switches are inexpensive but jam on rags and debris in raw sewage; sealed floats are more reliable; non-contact ultrasonic or radar transducers and bubbler systems are the most reliable and are preferred for municipal-grade duplex service. Specifying "floats or equal" in raw sewage invites the least reliable option. {note}
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## The panel shall provide a high-water alarm with an external audible horn and visual beacon.
−## The alarm notification path shall be coordinated so that an unattended station alarm reaches an operator; the panel shall provide dry contacts for connection to SCADA, BAS, or an auto-dialer. {note}
+## The alarm notification path shall be coordinated so that an unattended station alarm reaches an operator; the panel shall provide dry contacts for connection to SCADA, BAS, or an auto-dialer.
## A local horn and light that no one hears at night is not a notification path. The alarm output must be tied to a monitored system. {note}
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# Standby Power {toc}
−## Most AHJs require standby power for duplex and larger stations; the standby-power interface shall be specified explicitly to avoid a bid clarification. {note}
+## Most AHJs require standby power for duplex and larger stations; the standby-power interface shall be specified explicitly to avoid a bid clarification.
## The specification frequently omits whether the station requires a generator receptacle with manual transfer, an automatic transfer switch, or an integral engine-driven generator. The interface, transfer means, and connection details must be coordinated with [[sync/emergency-and-standby-power]]. {note}
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### The control panel shall receive a factory functional test confirming duty/standby alternation, protection devices, and alarm outputs.
−### Factory test reports shall be submitted before the station is shipped to the site. {note}
+### Factory test reports shall be submitted before the station is shipped to the site.
## Field Acceptance Testing {toc}
−### After installation, the station shall be operationally tested under field conditions to confirm correct control and alarm behavior. {note}
+### After installation, the station shall be operationally tested under field conditions to confirm correct control and alarm behavior.
−### The field test confirms the start and stop levels, the alternator sequence, the high-water alarm activation level, and the alarm notification path -- the items that cannot be verified at the factory because they depend on the installed elevations and the site telemetry connection. {note}
+### The field test confirms the start and stop levels, the alternator sequence, the high-water alarm activation level, and the alarm notification path — the items that cannot be verified at the factory because they depend on the installed elevations and the site telemetry connection. {note}
### The field test shall confirm the pump start and stop levels at the installed elevations.
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# Warranty {toc}
−## The manufacturer shall warrant the complete packaged station against defects in materials and workmanship for not less than one year from the date of substantial completion. {note}
+## The manufacturer shall warrant the complete packaged station against defects in materials and workmanship for not less than one year from the date of substantial completion.
## The pump and motor warranty period shall be as selected for the procurement.
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−## The warranty shall cover the coordinated performance of the assembly under single-source responsibility, not the individual components in isolation. {note}
+## The warranty shall cover the coordinated performance of the assembly under single-source responsibility, not the individual components in isolation.
# Spare Parts {toc}
−## The manufacturer shall furnish the spare parts and special tools needed to maintain the station through the warranty period. {note}
+## The manufacturer shall furnish the spare parts and special tools needed to maintain the station through the warranty period.
## Spare parts to be furnished shall be as selected below.
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## A complete spare pump shall be furnished where the AHJ requires on-site redundancy beyond the installed standby pump.