Pump Differential Pressure Required
1. Pressure required at top fixture PSIG
(use actual pressure required or estimate 30 PSIG)
2. Static Head - Building elevation - use actual or estimate PSI
using [number of floors x10 ft. x (.433 PSI/FT)]
3. Pipe friction loss, use actual or estimate using the greater of PSI
(10% of static head) or (3 PSI loss per 100 feet of run)
4. Pressure loss through building system components PSI
such as water softeners, mixing valve(s) etc.
5. Internal Booster System loss 5 PSI
6. Pressure required Total (1+2+3+4+5) PSIG
7. Subtract minimum suction pressure at Booster System PSIG
(Refer to definition 3 on page 2.00)
8. PUMP DIFFERENTIAL PRESSURE required (6 minus 7) PSI