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The Practical Pumping Handbook __-

Pipe Size Length of Pipe Hf per l OOft Friction Loss
3 inch 70 feet 8.90 feet 6.23 ft.
4 inch 20 feet 2.27 feet 0.454 ft.
Piping Losses 6. 684feet

Valves and Fittings Losses based on a Flow Rate of 200 gpm
(from Resistance Coefficient Tables and Friction Loss Tables)
Item K factor V2/2g Hf per Qty Total Hf
fixture
4" flanged Foot Valve 0.8 0.395 0.316 1 0.316 ft.
4" Flanged Long rad. Elbow 0.22 0.395 0.0869 1 0.0869 ft.
3" Flanged Gate Valve 0.25 1.17 0.2925 1 0.29 ft.
3" Flanged Check Valve 0.2 1.17 0.234 1 0.23 ft.
3" Long Rad. Flanged Elbow0.26 1.17 0.3042 2 0.6084 ft.
Valves and Fitting Losses 1.5313 ft.

Total Friction Losses = 6.684 + 1.5313 = 8.2153ft.
Implementing a 10% Safety Factor = 8.2153 x 1.1
Therefore Total Friction Losses (Hf) = 9.0 feet

H = Hs + Hsd + Hv + Hf
= 60 + 0 + 0.775 + 9.0
= 70 feet

Therefore design operating condition = 200 gpm @ 70 feet of Head
l

Tank 'B'
40 ft.

|

t.

Figure 3.22. Example 3-B diagram

m so