FORMULAS Flashcards
What is the friction loss for 1 3/4 inch hose per 100 feet?
15.5 psi per 100 feet.
What is the friction loss for 2 1/2 inch hose per 100 feet?
2 psi per 100 feet.
What is the friction loss for 3 inch hose per 100 feet?
0.8 psi per 100 feet.
What is the friction loss for 4 inch hose per 100 feet?
0.2 psi per 100 feet.
What is the friction loss for 5 inch hose per 100 feet?
0.08 psi per 100 feet.
What is the GPM formula?
GPM = 29.7 × d² × √NP
What is the Friction Loss formula?
FL = C × Q² × L
What is the Engine Pressure formula based on elevation in feet?
EP = 0.5 psi per foot of height.
What is the Engine Pressure formula based on number of floors?
EP = 5 psi × (Number of Floors - 1).
What is the Pump Discharge Pressure (PDP) formula?
PDP = NP + TPL.
What is the Net Pump Discharge Pressure (NPDP) formula?
NPDP = PDP - Intake Pressure.
What is the nozzle pressure for a handline smooth bore nozzle?
50 psi.
What is the nozzle pressure for a master stream smooth bore nozzle?
80 psi.
What is the standard nozzle pressure for all fog nozzles?
100 psi.
What is the low-pressure nozzle pressure for special fog nozzles?
75 psi or 50 psi depending on the nozzle.
What is the friction loss for appliances flowing less than 350 GPM?
0 psi.
What is the friction loss for appliances flowing greater than 350 GPM?
Add 10 psi.
What is the friction loss added for master stream appliances?
Add 25 psi.
What is the elevation pressure loss per foot of height?
0.5 psi per foot.
What is the elevation pressure loss per floor above ground level?
5 psi per floor (subtract 1 from floor count).
What pressure loss must be accounted for when pumping into a standpipe system?
25 psi for the standpipe appliance plus friction loss plus elevation loss.
What is the nozzle reaction formula for a smooth bore nozzle?
NR = 1.57 × d² × NP
What is the nozzle reaction formula for a fog nozzle?
NR = 0.0505 × GPM × √NP
