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Flashcards in Pump Equations Deck (7):
0

Calculate GPM for solid stream nozzle.

GPM= 29.7 x d² x ✔NP

29.7 = constant
d² = diameter of orifice in inches
✔NP = nozzle pressure in psi

1

Calculate nozzle reaction for solid stream nozzles

NR = 1.57 x d² x NP

NR is nozzle reaction in pounds
1.57 = a constant
d² = nozzle diameter in inches
NP = nozzle pressure in psi

2

Calculate nozzle reaction for fog stream nozzles.

NR = 0.0505 x Q x ✔NP

NR is nozzle reaction in pounds
0.0505 = a constant
Q = total flow in GPM
NP = nozzle pressure in psi

3

Determine friction loss.

FL = CQ²L

FL = friction loss
C = friction loss coefficient
Q² = flow rate in hundreds of GPM
L = hose length in hundreds of feet

4

Determine elevation pressure.

EP = 0.5H

EP = elevation pressure in psi
0.5 = a constant
H = height in feet

5

Determine elevation pressure inside a building.

EP = 5 psi x (number in stories -1)

EP = elevation pressure in psi

6

Determine total engine pressure.

EP = NP + FL ± EL + APP

EP = engine pressure
NP= nozzle pressure
EL = elevation loss or gain
APP = appliances