Approximate Maximum Flow Rates through Schedule 40 Pipe & Fittings for Selected Line Velocity
Pipe/Fitting Size 2 Ft/Sec. 4 Ft/Sec. 10 Ft/Sec. 15 Ft/Sec.
1 / 8” .269” ID 21.6 GPH 43.2 GPH 108 GPH 162 GPH
1 / 4” .364” ID 36.0 GPH 72.0 GPH 180 GPH 270 GPH
3 / 8” .493” ID 72.0 GPH 144 GPH 360 GPH 540 GPH
1 / 2” .622” ID 115 GPH 228 GPH 570 GPH 840 GPH
3 / 4” .824” ID 206 GPH 396 GPH 960 GPH 1,500 GPH
1” 1.049” ID 330 GPH 660 GPH 1,620 GPH 2,460 GPH
1-1 / 4” 1.660” ID 564 GPH 1,140 GPH 2,820 GPH 4,200 GPH
Table 1
Approximate Maximum Flow Rates through Fuel Hose for selected Line Velocity
Fuel Hose Size 2 Ft/Sec. 4Ft/Sec. 10 Ft/Sec. 15 Ft/Sec.
3 / 8 ~ .375” ID 36.0 GPH 72.0 GPH 180 GPH 270 GPH
1 / 2 ~ .500” ID 72.0 GPH 144 GPH 360 GPH 540 GPH
3 / 4 ~ .750” ID 180 GPH 360 GPH 900 GPH 1,500 GPH
1 ~1.000” ID 291 GPH 582 GPH 1,458 GPH 2,190 GPH
Table 2
Approximate Pressure Drop per Foot of Hose & Schd. 40 Pipe @ Selected Flow Rate and Line Velocity
2 Ft/Sec. 4 Ft/Sec. 10 Ft/Sec. 15 Ft/Sec.
Hose size
3 / 8 <.1 PSI @ 36 GPH .1 PSI @ 72 GPH 0.6 PSI @ 180 GPH 1.1 PSI @ 270 GPH
1 / 2 <.1 PSI @ 72 GPH .1 PSI @ 144 GPH 0.5 PSI @ 360 GPH 1.0 PSI @ 540 GPH
3 / 4 <.1 PSI @ 180 GPH .1 PSI @ 360 GPH .35 PSI @ 900 GPH 1.0 PSI @ 1,500 GPH
1 <.1 PSI @ 291 GPH .1 PSI @ 582 GPH .23 PSI @ 1,458 GPH 0.5 PSI @ 2,190 GPH
Table 3
Approximate Pressure Drop for 2 Full Flow Hose Fittings @ Selected Flow Rate and Line Velocity
2 Ft/Sec. 4 Ft/Sec. 10 Ft/Sec. 15 Ft/Sec.
Fitting-“
3 / 8 <.1 PSI @ 36 GPH .10 PSI @ 72 GPH .55 PSI @ 180 GPH 1.2 PSI @ 270 GPH
1 / 2 <.1 PSI @ 72 GPH .13 PSI @ 144 GPH 1.0 PSI @ 360 GPH 1.5 PSI @ 540 GPH
3 / 4 <.1 PSI @ 180 GPH .14 PSI @ 360 GPH 1.3 PSI @ 900 GPH 2.0 PSI @ 1,500 GPH
1 <.1 PSI @ 291 GPH .10 PSI @ 582 GPH .45 PSI @ 1458 GPH 1.3 PSI @ 2,190 GPH
DESIGNATED ENGINEER
954-562-7465
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1 Hg" = .4912 PSI
1 PSI = 2.04 Hg" To find restriction from pressure drop PSI X 2.04 = Hg"
1 Foot of Lift of Diesel is equal to .886 of Hg" Restriction
One 90 Degree Fitting is equal to 7' of Hose Run
2 Ft/Sec Flow may be to high and cause high restriction in some systems, and lead
to a short Primary Filter Life. (some Engines have a Max. Fuel restriction of 4 Hg" )
In calculating restriction, Total fuel flow GPH, fuel Hose ID, feet of fuel hose,
fittings, feet of lift or head of the fuel level, Type of Fuel filter must all be added in.
FUEL LINE AND PIPE RESTRICTION