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Cooling Water Pipe Lines

Sizing cooling water pipe lines - maximum allowable flow, velocity and pressure drops

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Main Pipes - maximum allowable flow, velocity and pressure drop

Pipe Size
(in)
FlowVelocityPressure Drop
(US gpm)(liter/s)(ft/s)(m/s)(ftH2O/100 feet)(Pa/100 m)
4 140 9 3.5 1.1 2.2 21827
6 380 24 4.2 1.3 1.9 18877
8 650 41 4.2 1.3 1.4 13371
10 1100 69 4.2 1.3 1.2 11700
12 1800 114 4.5 1.4 1.2 12093
14 2200 139 5.1 1.6 1.1 11208
16 3300 208 5.9 1.8 1.2 11405
18 4500 284 6.2 1.9 1.2 11503
20 6000 379 6.7 2.0 1.2 11503
24 11000 694 7.8 2.4 1.2 11700
30 19000 1199 8.7 2.6 1.1 10913
3 70 4 3.0 0.9 2.3 22712

Lateral Pipes - maximum allowable flow, velocity and pressure drop

Pipe Size
(in)
FlowVelocityPressure Drop
(US gpm)(liter/s)(ft/s)(m/s)(ftH2O/100 feet)(Pa/100 m)
4 200 13 5.1 1.5 4.3 42179
6 500 32 5.6 1.7 3.2 31364
8 900 57 5.8 1.8 2.5 24383
10 1500 95 6.1 1.9 2.1 20745
12 2400 151 6.8 2.1 2.1 20647
14 3100 196 7.2 2.2 2.1 20647
16 4500 284 7.9 2.4 2.1 20549
18 6000 379 8.3 2.5 2.0 19565
3 100 6 4.3 1.3 4.5 43949
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