Corpus sync: neutrality remakes, note hygiene, datasheet relocation, transformer-split cross-refs
---
title: Domestic Water Booster Pump Systems
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### Where the jurisdiction has adopted the UPC rather than the IPC, references to IPC chapter and section numbers shall be understood to mean the equivalent UPC provisions.
−### The Contractor shall confirm with the water purveyor any local rule governing direct connection of a booster pump to the public main, including any required minimum sustained suction pressure, before procuring equipment. {note}
+### The Contractor shall confirm with the water purveyor any local rule governing direct connection of a booster pump to the public main, including any required minimum sustained suction pressure, before procuring equipment.
# Submittals {toc}
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# Environmental and Service Conditions {toc}
−## The pumps, controls, and tank shall be suitable for the temperature, humidity, and atmosphere of the space in which the booster system is installed, and shall be selected for the available suction pressure and the potable water temperature. {note}
+## The pumps, controls, and tank shall be suitable for the temperature, humidity, and atmosphere of the space in which the booster system is installed, and shall be selected for the available suction pressure and the potable water temperature.
```datasheet
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## Available Suction Pressure {toc}
−## The available suction pressure is the single most important input to the booster design: the pump must add only the difference between the available pressure and the required boosted pressure, and the minimum suction pressure governs both pump selection and protection of the public main. {note}
+## The available suction pressure is the single most important input to the booster design: the pump must add only the difference between the available pressure and the required boosted pressure, and the minimum suction pressure governs both pump selection and protection of the public main.
```datasheet
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### The minimum available suction pressure shall be the residual pressure measured at the booster suction at the maximum instantaneous building demand, established from a current water purveyor flow test, not assumed.
−### The pump selection shall be based on the minimum suction pressure, so that the system delivers the required discharge pressure under the worst-case (lowest) supply condition. {note}
+### The pump selection shall be based on the minimum suction pressure, so that the system delivers the required discharge pressure under the worst-case (lowest) supply condition.
### An overestimated suction pressure produces a booster that cannot deliver the required discharge pressure when the city pressure drops at peak demand, which is exactly when the boost is most needed. {note}
## Design Flow and Boosted Pressure {toc}
−## Each booster system shall be selected to deliver the design peak flow at the required discharge pressure, with the operating point on the stable portion of the system curve. {note}
+## Each booster system shall be selected to deliver the design peak flow at the required discharge pressure, with the operating point on the stable portion of the system curve.
```datasheet
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### The required discharge pressure shall be set to deliver, at the highest and most remote fixture, not less than the minimum flow pressure required by the adopted plumbing code — generally not less than 8 psi at flush-tank fixtures and not less than 15 psi at flushometer-valve fixtures — after accounting for static lift and friction loss to that fixture.
−### The boost added by the pumps shall be calculated as the required discharge pressure less the minimum available suction pressure, so the pumps are not oversized for head they do not need to add. {note}
+### The boost added by the pumps shall be calculated as the required discharge pressure less the minimum available suction pressure, so the pumps are not oversized for head they do not need to add.
### The pump operating point shall fall on the stable portion of the certified curve, away from shut-off head and away from the runout end of the curve.
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## A booster system has no gravity bypass, so the consequence of a single pump failure is determined entirely by the number of pumps and whether a standby is provided. {note}
+### The pump configuration and redundancy basis shall be as indicated on the contract documents.
+
```datasheet
label: Pump Configuration
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```
−### The pump configuration and redundancy basis shall be as indicated on the contract documents.
−
### Booster systems serving occupancies that cannot tolerate a water outage — hospitals, laboratories, high-rise residential, and any system designated critical — shall provide N+1 redundancy, with one standby pump in addition to the pumps required to meet the design flow.
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# Pump Construction {toc}
−## The pump wetted materials, the shaft seal, and the motor shall be selected for continuous potable water service and for variable-speed operation. {note}
+## The pump wetted materials, the shaft seal, and the motor shall be selected for continuous potable water service and for variable-speed operation.
```datasheet
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### The motor shall be inverter-duty rated and shall comply with NEMA MG 1 so that its insulation system tolerates the VFD switching voltage over the service life of the system.
−### A pump motor that is sized only for the design operating point can be overloaded when it runs alone at low system pressure and high flow; the motor shall be non-overloading across the full curve. {note}
+### A pump motor that is sized only for the design operating point can be overloaded when it runs alone at low system pressure and high flow; the motor shall be non-overloading across the full curve.
# Control and Staging {toc}
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## At zero or near-zero demand a variable-speed booster cannot run a pump down to no flow without overheating it, so the system must either shut the pumps off and hold pressure with the tank or run a pump at a safe minimum. {note}
+### The control shall detect a no-flow or low-flow condition and shall either stop the pumps and allow the hydropneumatic tank to maintain system pressure until demand resumes, or maintain a safe minimum pump speed with thermal protection.
+
```datasheet
label: No-Flow Handling
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```
−### The control shall detect a no-flow or low-flow condition and shall either stop the pumps and allow the hydropneumatic tank to maintain system pressure until demand resumes, or maintain a safe minimum pump speed with thermal protection.
−
### Where no-flow shutdown is used, the control shall restart the lead pump automatically when the system pressure falls to the restart threshold as the tank draws down.
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# Low-Suction Protection {toc}
−## The booster shall protect the public water main from being drawn below its minimum required residual pressure, because pulling the main into a vacuum risks collapsing the supply and inducing backflow of contaminants into the potable system. {note}
+## The booster shall protect the public water main from being drawn below its minimum required residual pressure, because pulling the main into a vacuum risks collapsing the supply and inducing backflow of contaminants into the potable system.
```datasheet
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### A low-suction-pressure cutoff shall be installed that stops the booster pumps before the suction pressure falls low enough to create a vacuum on the suction side, in accordance with IPC Section 606.5.5 (or the equivalent UPC provision).
−### Where the booster pump is directly connected to the public water main, the low-suction cutoff shall be set and located so that the pressure on the suction side is not reduced below the minimum required by the adopted code at the point and within the distance the code specifies. {note}
+### Where the booster pump is directly connected to the public water main, the low-suction cutoff shall be set and located so that the pressure on the suction side is not reduced below the minimum required by the adopted code at the point and within the distance the code specifies.
### The low-suction cutoff shall automatically restart the pumps after the suction pressure recovers above a reset threshold set above the cutoff setpoint, so the system does not chatter on and off at the trip point.
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## The hydropneumatic (bladder) tank holds a cushion of pressurized water so that the pumps can shut off at no flow, so that small leak or trickle demands are met without starting a pump, and so that the pumps do not start and stop rapidly at low demand. {note}
+### Where the control uses no-flow shutdown, a hydropneumatic tank shall be provided, sized to hold sufficient drawdown that the system pressure does not fall to the restart threshold before the tank meets a small demand, so the pumps are not started for a trickle.
+
```datasheet
label: Hydropneumatic Tank Provided
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```
−### Where the control uses no-flow shutdown, a hydropneumatic tank shall be provided, sized to hold sufficient drawdown that the system pressure does not fall to the restart threshold before the tank meets a small demand, so the pumps are not started for a trickle.
−
### The tank shall be the bladder or diaphragm type that separates the pressurized air charge from the potable water, and the bladder material shall be certified to NSF/ANSI/CAN 61 for potable contact.
### The tank precharge (air) pressure shall be set per the manufacturer's instructions relative to the pump restart pressure, and the as-left precharge shall be recorded in the start-up report.
−### A tank precharge set wrong defeats the tank: too high and the tank holds little water and the pumps short-cycle anyway, too low and the bladder is over-stressed; the precharge shall be set to the manufacturer's value and verified at start-up. {note}
+### A tank precharge set wrong defeats the tank: too high and the tank holds little water and the pumps short-cycle anyway, too low and the bladder is over-stressed; the precharge shall be set to the manufacturer's value and verified at start-up.
### The tank shall be rated for the maximum system working pressure, and where its size and pressure exceed the code pressure-vessel threshold it shall bear the ASME stamp.
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## The pumps, manifolds, valves, tank, controls, and sensors shall be assembled on a common factory-fabricated skid so the system is delivered, set, and connected as a coordinated package. {note}
−```datasheet
−label: Manifold Material
−type: radio
−options:
− - "Type 304 stainless steel (standard potable booster manifold)"
− - "Type 316 stainless steel (corrosive water or coastal environment)"
− - "Copper or copper alloy"
−default: "Type 304 stainless steel (standard potable booster manifold)"
−```
−
### Each pump shall be provided with an isolation valve on its suction and an isolation valve and a check valve on its discharge, so that any pump can be isolated and removed while the remaining pumps stay in service.
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### All manifold and valve wetted materials shall be certified to NSF/ANSI/CAN 61 and NSF/ANSI/CAN 372.
+```datasheet
+label: Manifold Material
+type: radio
+options:
+ - "Type 304 stainless steel (standard potable booster manifold)"
+ - "Type 316 stainless steel (corrosive water or coastal environment)"
+ - "Copper or copper alloy"
+default: "Type 304 stainless steel (standard potable booster manifold)"
+```
+
# Electrical {toc}
## Each pump motor and its VFD shall be served and protected in accordance with NEC Article 430, and the control panel shall comply with NEC Article 409 and be listed under UL 508A. {note}
+### Each pump motor shall be provided with branch-circuit protection, a disconnecting means, and motor overload protection in accordance with NEC Article 430.
+
+### A disconnecting means for the booster system shall be provided as required by the NEC and located for safe servicing.
+
+### Motors shall comply with NEMA MG 1 and shall be inverter-duty rated where driven by a VFD, so the motor insulation tolerates the drive's switching voltage.
+
+### The control panel enclosure shall be rated for the environment in which it is installed.
+
```datasheet
label: Control Panel Enclosure Rating
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```
+### The electrical service characteristics shall be coordinated with [[drawing: the electrical one-line diagram]] before the equipment is procured.
+
```datasheet
label: Electrical Service
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```
−### Each pump motor shall be provided with branch-circuit protection, a disconnecting means, and motor overload protection in accordance with NEC Article 430.
−
−### A disconnecting means for the booster system shall be provided as required by the NEC and located for safe servicing.
−
−### Motors shall comply with NEMA MG 1 and shall be inverter-duty rated where driven by a VFD, so the motor insulation tolerates the drive's switching voltage.
−
−### The control panel enclosure shall be rated for the environment in which it is installed.
−
−### The electrical service characteristics shall be coordinated with [[drawing: the electrical one-line diagram]] before the equipment is procured.
−
### The booster system feeder and any standby-power connection shall be coordinated with the electrical scope, and a system serving an essential facility shall be connected to the emergency or standby power system where the building is provided with one.
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# Installation {toc}
−## General {toc}
+## The Contractor shall set the booster skid level on the housekeeping pad and connect the suction and discharge to the building domestic water piping through the flexible connectors and isolation valves.
−### The Contractor shall set the booster skid level on the housekeeping pad and connect the suction and discharge to the building domestic water piping through the flexible connectors and isolation valves.
+## The suction connection shall be made downstream of the building service backflow protection and any required water meter, coordinated with [[sync/backflow-prevention]] and [[sync/domestic-water-piping]].
−### The suction connection shall be made downstream of the building service backflow protection and any required water meter, coordinated with [[sync/backflow-prevention]] and [[sync/domestic-water-piping]].
+## Service clearances around the skid shall be maintained so that any pump, the control panel, and the tank can be serviced and removed without disturbing the others.
−### Service clearances around the skid shall be maintained so that any pump, the control panel, and the tank can be serviced and removed without disturbing the others.
+## The equipment location and service clearances shall be [[drawing: per the mechanical room layout drawings]].
−### The equipment location and service clearances shall be [[drawing: per the mechanical room layout drawings]].
−
## Coordination {toc}
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## The hydropneumatic tank shall be stored protected from impact and from prolonged direct sunlight, and the bladder shall not be subjected to freezing.
−## Open suction and discharge connections shall be capped until the piping is connected, to keep construction debris and contaminants out of the potable wetted path. {note}
+## Open suction and discharge connections shall be capped until the piping is connected, to keep construction debris and contaminants out of the potable wetted path.
# Warranty {toc}
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## Where a manufacturer warranty extends beyond the Contractor's installation warranty period, the Contractor shall assign and transfer the manufacturer warranty to the Owner at closeout.
−## A booster system that runs but was set with the wrong discharge pressure, an unverified low-suction cutoff, a mis-precharged tank, or a delivered pressure that does not satisfy the served fixtures shall be corrected at the Contractor's expense if the deficiency is discovered within the warranty period. {note}
+## A booster system that runs but was set with the wrong discharge pressure, an unverified low-suction cutoff, a mis-precharged tank, or a delivered pressure that does not satisfy the served fixtures shall be corrected at the Contractor's expense if the deficiency is discovered within the warranty period.
# Spare Parts {toc}
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## The spare parts list and the recommended replacement interval for wear items shall be included in the operation and maintenance manual.