System Sizing Worksheet

Instructions: Follow steps 1 and 2 to select the proper water pressure booster systems.

STEP 1

Since municipal water pressure is often sufficient to handle the needs of many buildings, first determine if a water
pressure booster system is required.

Project Criteria PSI
A. Pressure required at the highest outlet
B. Static Head from Pump Package Inlet (Elevation in feet x .433psi/ft)
D. Pressure loss through building system components such as water filters. softeners, etc.
F. Subtract the minimum suction pressure at the pump The minimum pressure after water meter
and backflow preventer
SPECIFY WITH CONFIDENCE, SPECIFY PENN PUMP SYSTEMS

Fixture Flow Units

STEP 2

Instructions: Use this table to determine peak flow capacity. Do not include fixtures not serviced
by the water pressure booster system.

Fixture Occupancy Load in Fixture Units x Number of Fixtures
Bathroom Group F.V. * Private 8 x
Bathroom Group F.T.* Private 6 x
Water Closet F.V.* Public 10 x
Water Closet F.T* Public 5 x
Urinal-Stall or Wall Public 5 x
Lavatory Public 2 x
Bathtub Public 7 x
ShowerHead Each ** Public 7 x
Kitchen Sink Public 7 x
Service Sink Public 3 x
Clothes Washer Private 2 x
Clothes Washer Public 4 x
Dishwasher Public 6 x
Drinking Fountain Public 2 x
3/4″ Connection Public 6 x

Building Type
School/Apartment/Office
Hotal
Hospital

Pump split:

Duplex pump split
100/100 65/65 50/50

Triplex Pump split
35/35/35 50/50/50
F.V.* = Flush Valve, F.T.* = Flush Tank ** A showerhead over a bathtub does
not add a fixture unit to the group
Modal will be an estimate please contact sale person for exact modal.

Added Service – Flow required for any special duty such as future expansion, irrigation systems,
and cooling tower evaporation make up (Use (1) GPM per 20 tons cooling).

Laundries – In the case of hotels and hospitals, where a laundry is operated, increase the total
pumping
capacity by 10%.

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