Hydraulic Cheat Sheet - North Branford, Connecticut
Simplified Hydraulics
Nozzles Pressures
Smooth Bore=50 psi
TFT/Fog=100 psi
Fire Hose Friction Loss
1 ¾” hose:
125 gpm=20 psi/100’
150 gpm=35 psi/100’
175 gpm=45 psi/100’
2 1/2” hose:
250 gpm=15 psi/100’
300 gpm=20 psi/100’
350 gpm=25 psi/100’
400 gpm=30 psi/100’
Supply Line Friction Loss
5” hose:
500 gpm=2 psi/100’
750 gpm=4 psi/100’
1000 gpm=8 psi/100’
1250 gpm=10 psi/100’
1500 gpm=20 psi/100’
Master Stream Appliances
Appliance/Fixed=10-25 psi (may vary on how apparatus is plumbed).
Appliance/Remote=25psi
Smooth Bore Stacked Tips (1 1/2”, 1 3/4:, 2”)=80 psi (1”, 1 1/8”, 1 ¼”) = 50 psi
Fog Tip=100psi
Stacked Tips GPM:
1 3/8”=500 gpm
1 ½”=600 gpm
1 ¾”=800 gpm
2”=1000 gpm
Standpipe Operations
2- 2 ½” lines with a NPDP of at least 150 psi. .
*Add 5 psi/story.
Miscellaneous
5 psi/ story or ½ lb per foot of height (.434 psi/foot of elevation).
10 psi for each appliance when flowing more than 350 gpm (gates, wyes and adapters).
*Always have a minimum of 20 psi of residual pressure during pumping operations.
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