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The Practical Pumping Handbook ~- - ::;:;;- .......... : _~~

Velocity Head (Hv) at 160 gpm
(from Friction Loss Tables)
V2/2g on 3 inch discharge - V2/2g on 4 inch suction
Therefore 0.749 feet - 0.253 feet
Velocity Head = 0.496 feet

Friction Loss (Hf)
Piping Losses based on a Flow Rate at 160 gpm
(from Friction Loss Tables)

Pipe Size Length of Pipe Hf per l OOft Friction Loss
3 inch 80 feet 5.81 feet 4.648 ft.
4 inch 5 feet 1.49 feet 0.0745 ft.
Piping Losses 4. 7225 ft

Valves and Fittings Losses based on a Flow Rate of 160 gpm
(from Resistance Coefficient Tables and Friction Loss Tables)
Item K factor V2/2g Hf per Qty Total Hf
fixture
4" Flanged Gate Valve 0.16 0.253 0.04048 2 0.08096 ft
3" Flanged Gate Valve 0.25 0.749 0.18725 2 0.3745 ft
3" Flanged Check Valve 0.2 0.749 0.1498 1 0.1498 ft
3" Long Rad. Flanged Elbow0.26 0.749 0.19474 1 0.19474 ft
Valves and Fitting Losses 0.8feet

Total Friction Losses = 4.7225 + 0.8 = 5.5225feet

Implementing a 10% Safety Factor = 5.5225 x 1.1

Therefore Total Friction Losses (Hf) = 6.07475 feet

H = Hs + Hsd + Hv + Hf
50 + 161.45 + 0.496 + 6.075
218 feet
Therefore design operating condition = 170 gpm @ 218 feet of Head

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