System Sizing Worksheet

Instructions: Follow steps 1,2 and 3 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 CriteriaPSI
A. Pressure required at the highest outlet
B. Pump Package Inlet (Elevation in feet)
B. Static Head from Pump Package Inlet (Elevation in feet x .433psi/ft)
C. Piping friction loss (Estimate 10% of static head in PSI)
D. Pressure loss through building system components such as water filters. softeners, etc.
E. Required building system pressure ( Add A+B+C+D)
F. Subtract the minimum suction pressure at the pump ( The minimum pressure after water meter and backflow preventer
G. Total (E minus F)
H. Add internal water booster pressure loss (5 psig)
I. Required pump differential pressure “Boost” (G+H)
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 Total
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 2 x
Drinking Fountain Public 2 x
3/4″ Connection Public 6 x
Total Flow Fixture Units =
F.V.* = Flush Valve, F.T.* = Flush Tank ** A showerhead over a bathtub does not add a fixture unit to the group

System GPM Load

STEP 3

Instructions: After determining the total fixture flow units, convert to gallons per minute load(GPM).

Fixture Flow UnitsSchool,Office,Apt. GPMHotel GPMHospital GPM
1007080100
3008090100
600100100120
900120125135
1200135145155
1500150165185
1750170185200
2000190200220
3000250275300
4000300340365
5000350400430
6000400450490
7000450500540
8000490550600
Table No. 3
Required System GPM:
Planned “Added Service”:
Total Peak Load GPM:

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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