water pressure booster worksheet – Penn Pump & Equipment Inc.

Water Pressure Booster System Selector

Do you already know the required system flow and boost pressure for your project?

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Required System Flow (GPM)

Required Boost Pressure (PSI)

What configuration would you like?*	Simplex Duplex Triplex Other
Desired pump split (% of total system GPM per pump)*	/ / All split fields stay synchronized. Maximum value is 100%.

Step 1 – Required Boost Pressure

Determine whether a water pressure booster system is required and calculate the required pump differential pressure.

Project Criteria	PSI
A. Pressure required at the highest outlet*
B. Height of highest fixture relative to Pump Package (feet)*
B. Static Head from Pump Package Inlet (Elevation in feet × .433 PSI/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 (A+B+C+D)
F. Minimum expected incoming pressure at the pump after meter and backflow preventer*
G. Total (E minus F)
H. Internal water booster pressure loss
I. Required pump differential pressure “Boost” (G+H)

Step 2 – Fixture Flow Units

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
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
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.

Step 3 – System GPM Load

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

Added Service: Include flow required for future expansion, irrigation systems, cooling tower evaporation make-up, or other special duty.

Laundries: For hotels and hospitals where a laundry is operated, the worksheet instructs the designer to increase total pumping capacity by 10%.

Minimum Required System GPM Reference

Fixture Flow Units	School, Office, Apt. GPM	Hotel GPM	Hospital GPM

Booster Systems