* Hydraulics (pt 1) Flashcards
Main hydraulic equation
EP = NP + FL + AP +/- EL
Elevation gain or loss =
½ psi per foot or 5 psi per floor
Fog Nozzle GPM’s
Master stream fog
500-2000 GPM @100psi
Fog Nozzle GPM’s
Ground monitor fog
50-1250 GPM @100psi
Fog Nozzle GPM’s
Blitz fog
100- 500 GPM @100psi
Appliance FL
Gated Wye
10 psi (> 350 GPM)
Appliance FL
Monitor
20 psi (> 350 GPM)
Appliance FL
Blitz
10 psi (> 350 GPM)
Appliance FL
Standpipe
25 psi (> 350 GPM)
Appliance FL
Dry Ladder
80 psi (> 350 GPM)
Appliance FL
L259
80 psi (> 350 GPM)
Appliance FL
Deck Gun
20 psi
>350gpm
Appliance FL
Sprinklers / stand pipe
150 psi
Appliance FL
Forward Pumper
- 20 psi
- for any GPM
- Including wet ladders if going through pump intake
Nozzle Pressures
Smooth Bore Master
80 psi
Friction Loss
1 ¾ “ hose
FL/ 100’
165 GPM’s = 25 psi
185 GPM’s = 30 psi
2 1/2 “ hose
FL/ 100’
5psi / 50’ for both preconnect and high rise packs (for both 1 1/8 and 1 3/16)
Blitz Solid Stream tip GPM’s: (50 psi NP )
1” = 200
1 ¼ ” = 300
1 ½ “ = 450
Ladder Solid Stream GPM’s (80 psi NP )
2 ¼ “ = 1345
2 ½ “ = 1660
2 ¾ “ = 2010
Maximum Hose Operating Pressure
- Double Jacket attack lines = 200 psi
- Double Jacket 5” Supply (dry ladder) = 250 psi
- Single Jacket and Single Jacket Supply = 180 psi
Solid Stream Nozzle GPM
( 50 psi NP ) Hand line
15/16” = 185
1“ = 200
1 1/8 “ = 265
1 3/16” = 296
1 ¼” = 300
Solid Stream Nozzle GPM
( 80 psi NP ) Master Stream
1 3/8 “ = 500
1 ½ “ = 600
1 5/8 = 700
1 ¾” = 800
1 7/8” = 900
2” = 1000
Hydrant Performance / Pressure Drop
( Static – Residual ) X 100
————————————
Static
% Additional Water Available
0-10% — 3x amt. being delivered
11-15% — 2x amt. being delivered
16-25% — 1x amt. being delivered
> 25% — Less than what is being delivered
Class A Foam and Application Rates
- .1 - .2 % = Best for overhaul ( wet foam )
- .3 - .5 % = Initial fire attack
- 1 % = Exposure protection ( dry foam )
- CAFS : Must have a 50-psi differential between intake pressure and discharge pressure [*Example: Intake of 50 psi from hydrant, discharge pressure needs to be 100 psi]
Coefficients for 1 3/4”; 2 1/2”; 5”
1 3/4” – 9
2 1/2” – 1
5” – 0.05
Formula for friction loss
FL = (C x Q squared) (L)
What is application rate for new B500 foam?
3% for class B 1/4, 1/2, 1% for class A
Formula for Q
GPM/100
Formula for L
Hose Length / 100
