Formulas Flashcards
(29 cards)
Discharge Rate (GPM)
Solid stream
GPM = 29.7 X d X √NP
Nozzle reaction for a solid stream
NR = 0.0015 x d² x np
Nozzle Reaction for fog nozzle
NR = .0505 x Q x √NP
Friction Loss
FL = CQ²L
Elevation Pressure Loss
EP = .5H
Elevation pressure loss in a multi-story building
EP = 5 x (number of stories - 1)
Pump Discharge pressure
PDP = NP + TPL
(NP = nozzle pressure)
(TPL = Total pressure loss)
Net pump discharge pressure
NPDP = PDP - Intake reading
3in hose Q formula
FL= Q²
4in hose Q formula
FL = Q²/5
5in Q formula
FL = Q²/15
pumpers needed for a relay
P = R/D + 1
( R = relay distance)
(D = coefficient)
Water shuttle Flow Rate
Flow = .9 x TS
divided by Trip time in mins
(TS = tank size)
(.9 = constant)
Travel Time for water shuttle
TT= .65 + (1.7)(distance)
(Distance will be round trip
Handling time for water shuttle
Fill site time + Dumpsite time
Tender Flow Rate
Flow = .9 x TS
divided by Trip time in mins + Handling TIme
(TS = tank size)
(.9 = constant)
Determining Maximum Lift
L = 1.13Hg
(Hg = inches in mercury)
Pressure Correction
PC = Lift + Total intake Hose friction Loss
Divided by 2.3
Net pump discharge pressure at draft
NPDP = PDP + PC
(pump discharge pressure)
(intake pressure correction)
Square/rectangle Pool Capacity
C = 7.5 x L x W x D
Round Pool Capcity
C = 7.5x 𝝅 x r² x D
1in Booster Coefficient
150
1 3/4in Coefficient
15.5
2in Coefficient
8
