HYDRAULIC FORMULAS Flashcards
1
Q
GPM
A
29.7 D^2 √NP
2
Q
Volume of Cyl. or round pool/pond
A
∏ xR^2 x D x 7.5
3
Q
Volume of water in a square/ rectangle
A
L x D x W x 7.5
4
Q
Weight of water in 50ft of hose
A
17 (D^2)
5
Q
Gallons of water in 50ft of hose
A
2.04 (D^2)
6
Q
Elevation Pressure
A
0.5psi per foot of elevation gain/loss
OR
5psi per floor minus the first floor
7
Q
Appliance FL from FGH
A
20 PSI for:
Deck gun when mounted on the engine
All master stream bases
5” to 2 1/2” water thief above 350gpm
8
Q
Appliance FL from IFSTA
A
25psi for all Masterstreams
0 for the appliance if 350 gpm
10psi if >350gpm
9
Q
NFSAFER
A
Nozzle pressure FL in Attack line Standpipe Appliance FL in supply line Elevation Relay
10
Q
NR Smooth Bore
A
1.57 x D^2 x NP
11
Q
NR FOG
A
0.0505 x Q x SQRoot of NP
