Nozzle Pressure. Designed Nozzle Pressures. Smooth Bore Nozzle - Handline 50 PSI Smooth Bore Nozzle - Master Stream 80 PSI Combination Nozzle - (all types) 100 PSI. What is the “Best Nozzle Pressure”?. 125 psi?. 75 psi?. Lower?. 100 psi?. 85 psi?. Higher?. 50 psi?.
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NFPA # 1964 - Spray Nozzles
2-1.1 Rated pressure for spray nozzles shall be 100 psig. The nozzle discharge rating shall be expressed as a rated discharge at a rated pressure [e.g., 60 gpm at 100 psig.]
Reaction= .0505 x GPM x sq. rt. of nozzle pressure
@ 200 GPM
100 psi nozzle pressure = 101 lbs.
75 psi nozzle pressure = 87.5 lbs.
13% Less Reaction Force
Note increased flow at lower nozzle pressure. Pump pressure was not changed.