water pressure booster worksheet – Penn Pump & Equipment Inc.

Water Pressure Booster System Selector

Prefer to print the System Sizing Worksheet? Download the PDF.

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

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Boost Pressure

Required System Flow

What configuration would you like?*	Simplex Duplex Triplex Other
What is the desired split?* If you require a different split, please contact us.	//

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. Height of highest fixture relative to Pump Package (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. Enter the minimum expected incoming pressure at the pump (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)

Step 2 – Fixture Flow Units

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
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

Step 3 – System GPM Load

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

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

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).

Choose Facility Type
Required System GPM:
Planned “Added Service”:
Total Peak Load GPM:

Minimum Required System GPM Reference

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

Booster Systems

Hydronic & HVAC Systems

Fuel & Specialty

Steam & Boiler

Accessories & Components

General Purpose Pumps (via Federal Pump)

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