System Sizing Worksheet
Instructions: Follow steps 1,2 and 3 to select the proper water pressure booster systems.
Since municipal water pressure is often sufficient to handle the needs of many buildings, first determine if a water pressure booster system is required.
|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)|
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||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|
|ShowerHead Each **||Public||7||x|
|Total Flow Fixture Units =|
System GPM Load
Instructions: After determining the total fixture flow units, convert to gallons per minute load(GPM).
|Fixture Flow Units||School,Office,Apt. GPM||Hotel GPM||Hospital GPM|
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%.