General Hydraulics Flashcards
Nozzle Pressure (NP)
- solid master
- solid handline
- fog master
- fog handline
Solid master - 80 solid handline - 50 fog master - 100 fog handline - SM20LP -75 - elkhart/fog/ 100 - card
When does FL in an appliance come into effect?
When GPM are equal to or greater than 350 GPM
FL in reducers and gated wyes when flowing over 350 GPM?
10 PSI FL
FL from monitors, deck guns, and standpipes/ladders?
25 PSI FL
Rule of 8’s?
Using tip size numerator in 1/8's. 1 1/4 -400 1 3/8 -500 1 1/2 -600 1 5/8 - 700 1 3/4 - 800 1 7/8 - 900 2 - 1000
Friction Factors
1”, 1 3/4”, 2 1/2”, 2 x 2 1/2”, 5”
1" -97 1 3/4" -8 2 1/2" -1 2 x 2 1/2" - 0.25 5" - 0.03
Elevation Loss (EL)
(+/-) 5 PSI per floor
(+/-) 1/2 of elevation
Attack pack pump discharge pressure (PDP)?
100’ - 100 PSI
200’ -120 PSI
Pump discharge pressure is the result of what four factors?
NP + FL + AP +/- EL
*not to exceed 200PSI
Friction loss equation
FL=2Q(2)xFxL
Q=GPM/100
F=friction factor
L=length/100
FL per 100’ of 5”
GPM-----FL 400 1 500 1.5 600 2 700 3 750 3.5 (FOG) 800 4 900 5 1000 6
Starts at 1 PSI FL at 400 GPM to 6 PSI at 1000 GPM
Hydrant performance-
residual drops 0-10%
3 x current volume
Hydrant performance-
residual drops 11-15%
2 x current volume
Hydrant performance-
residual drops 16-25%
1 x current volume
Hydrant performance-
residual drops 25+%
No additional GPM