Pump Equations Flashcards
0
Q
Calculate nozzle reaction for solid stream nozzles
A
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
1
Q
Calculate GPM for solid stream nozzle.
A
GPM= 29.7 x d² x ✔NP
29.7 = constant d² = diameter of orifice in inches ✔NP = nozzle pressure in psi
2
Q
Calculate nozzle reaction for fog stream nozzles.
A
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
Q
Determine friction loss.
A
FL = CQ²L
FL = friction loss C = friction loss coefficient Q² = flow rate in hundreds of GPM L = hose length in hundreds of feet
4
Q
Determine elevation pressure.
A
EP = 0.5H
EP = elevation pressure in psi 0.5 = a constant H = height in feet
5
Q
Determine elevation pressure inside a building.
A
EP = 5 psi x (number in stories -1)
EP = elevation pressure in psi
6
Q
Determine total engine pressure.
A
EP = NP + FL ± EL + APP
EP = engine pressure NP= nozzle pressure EL = elevation loss or gain APP = appliances
