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Formulas

Fire ground formulas

QuestionAnswer
Nozzle Reaction Fog .0505 x Q x √NP
Nozzle Reaction SS 1.57 x D² x NP
Pump Discharge Pressure PDP NP + FL + FL² + APP + EL
Nozzle Flow GPM 29.7 x D² x √NP
Friction Loss C x Q² x L
Weight of air 14.7 @ sea Level .5 PSI per 1000ft
Weight of 1 Gallon of Water 8.3 lbs
Weight of 1 cubic foot of water 62.4 lbs
Gallons of water in 1 Cubic foot 7.5 gallons
Pressure of 1" column 1 foot tall .434 PSI
Feet required to exert 1 PSI 2.304 Feet
Friction loss 2 1/2" hose (Q +Q) x Q
Friction loss 1 3/4" hose for 100 GPM 125 GPM 150 GPM 185 GPM 200 GPM 8 PSI 12 PSI 18 PSI 24 PSI 30 PSI
PSI for sprinkler system 150 in volume
PDP for Stand pipe system 110 + elevation
Relay pumping <500 GPM 500-1000 GPM >1000 GPM 80 PSI 120 PSI 150 PSI
Friction loss Coefficients 1" hose 1 3/4" hose 2 1/2" hose 5" hose 150 7 2 .08
Hose Test pressures 1" hose 1 3/4" hose 2 1/2" hose 5" hose HP 5" hose 300 400 400 200 300
Maximum Lift (L) 1.13 x (Hg)
Back Pressure foam system (BP) (NP +FL +EL) / 200 (can't exceed 70%) Or 40 PSI FL after the inductor
Head Pressure (HP) height/2.304 PSI
Adequacy of stream Area x velocity x 7.5
Capacity of rect/square pool L x W x D x 7.5 in Gallons
Capacity of round pool π x r² x d x 7.5 in Gallons
Max Flow Relay Method 40 PSI residual + FL in 5" hose
Max Distance Relay Method 5" hose 80 PSI flowing 500 GPM <1000' 120 PSI flowing 1000 GPM <1000' 150 PSI flowing 1250 GPM <1000' 150 PSI flowing 1500 GPM <700'
Pump Capacities 150PSI-100% 200PSI-70% 250PSI-50%
Created by: Scottpruett