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The Practical Pumping Handbook - ~ ~-~

Friction Loss (Hf)
Piping Losses based on a Flow Rate of 340 gpm
(from Friction Loss Tables)
Pipe Size Length of Pipe Hf per 100ft Friction Loss
4 inch 130 feet 6.19 feet 8.047 ft.
6 inch 25 feet 0.806 0.2015 ft.
Piping Losses 8.2485 feet

Valves and Fittings Losses based on a Flow Rate of 340 gpm
(from Resistance Coefficient Tables and Friction Loss Tables)
Item K factor V2/2g Hf per Qty Total Hf
f~tu~
6" flanged Gate Valve 0.11 0.222 0.02442 0.04884 ft.
6" flanged Std. Elbow 0.29 0.222 0.06438 0.12876 ft.
4" flanged Gate Valve 0.16 1.14 0.1824 0.3648 ft.
4" flanged Check Valve 0.2 1.14 0.228 0.228 ft.
4" long rad. Flanged Elbow 0.22 1.14 0.2508 0.2508 ft.
Valves and Fitting Losses 1.0212feet

Total Friction Losses = 8.2485 + 1.0212 = 9.2697ft.

Implementing a 10% Safety Factor = 9.2697 x 1.1

Therefore Total Friction Losses (Hf) = 10.2 feet

H Hs + Hsd + Hv. + Hf
40 + 0 + 0.918 + 10.2
m
51.118 feet

Therefore design operating condition = 340 gpm @ 51 feet of Head

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