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# Cooling Water - Pipe Lines

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

### Main Pipes - maximum allowable flow, velocity and pressure drop

Cooling Water - Main Pipes
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

Cooling Water - Lateral Pipes
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

## Related Topics

• ### Piping Systems

Calculate dimensions of pipes and tubes. Pressure drop calculations and head loss charts. Use of different piping materials. Insulation of pipes and tubes and heat loss diagrams.

## Related Documents

Calculating chiller and cooling tower refrigeration loads - in tons.
• ### Chilled Water Systems

Chilled water system equations - evaporator and condenser flow rates.
• ### Cooling Tower Efficiency

Maximum cooling tower efficiency is limited by the cooling air wet-bulb temperature.
• ### Insulation of Cooling Systems

Cooling systems and insulation thickness.
• ### Water - Absolute (Dynamic) Viscosity vs. Temperature and Pressure

Absolute viscosity for water in centipoises for temperatures between 32 - 200oF.
• ### Water Systems - Maximum Flow Velocities

Water velocities in pipes and tubes should not exceed certain limits.

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## Citation

• The Engineering ToolBox (2014). Cooling Water - Pipe Lines. [online] Available at: https://www.engineeringtoolbox.com/cooling-water-piping-systems-d_1884.html [Accessed Day Month Year].

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7.8.15

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