When making a friction loss calculation, the driver/operator must also account for ____________ as well as ______ that may be in use with the hoseline.
The length of the hose
Friction Loss Equation
FL = CQ²L
C = Friction loss coefficient Q = Flow rate in hundreds of gpm. (gpm/100) L = Hose length is hundreds of feet. (feet/100)
Master stream appliance friction loss.
Appliance friction loss other than master stream devices.
Elevation pressure loss equation.
EP = 0.5H
EP = Elevation pressure H = Height in feet
Elevation pressure loss equation for a multi-story building.
EP = (5 psi) x (number of stories - 1)
When considering pressure loss in an elevated waterway, assume a loss of __ psi for the waterway and master stream appliance.
Pump Discharge Pressure Equation
PDP = NP + TPL
TPL = Total pressure loss in psi (friction, elevation, and appliances)
Net Pump Discharge Pressure Equation
NPDP = PDP - Intake Reading
PDP = Pump Discharge Pressure
Friction Loss Coefficients
1 - 150
1.5 - 24
1.75 with 1.5 couplings - 15.5
2.5 - 2
3 with 2.5 couplings - 0.8
5 - 0.08
Friction Loss Coefficients - Siamese Lines = length
2 - 2.5 - 0.5
3 - 2.5 - 0.22
2 - 3.5 with 2.5 couplings - 0.2
Friction Loss Coefficients - Standpipes
4” - 0.374
5” - 0.126
6” - 0.052