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PlumbingSupply.US - Water Flow Calculator

This calculator is used to calculate pipe friction losses for straight piping handling water and water with varying percentages of ethylene glycol. The calculator uses an algorithm developed from the basic principles of fluid mechanics. The program is based on the Darcy-Weisbach equation, the Colebrook equation, and the Moody equation. The program is intended for use only on straight piping. The program does not include pressure losses due to elevation differences, or flow through fittings.

This calculator allows the user to input the fluid type, the fluid temperature, the flow rate, the pipe size, pipe length, and pipe material. The calculator then determines the velocity, the Reynolds number, the Moody friction factor, the pipe friction factor (from the Colebrook equation), the pipe head loss, and the pipe friction loss in PSI. This new version also calculates losses for fittings, valves, and other losses which the user specifies. The new version calculates recommended control valve coefficients (if a control valve is specified), and it also calculates total fluid volume in the piping system (this is real handy for determining the amounts of water conditioners to add, and to design expansion tanks). Please feel free to try out this fabulous PlumbingSupply.US technical resource.

Please note that this method works for turbulent flow situations where the Reynolds Number is greater than 3000. If you find that your Reynolds number is less than 3000, you should revise your input parameters (increase the flow rate and/or reduce the pipe size).

Additional Design Criteria: If your piping is being used in an open loop system, flow velocities should be in the range of 5 to 10 ft/sec. For closed loop piping systems, you should use a 4 ft/sec limit for piping of 2" or less. For larger pipe sizes, use a limit of 4 FT of head loss per 100 FT of pipe.

Fluid Temp F:
Fluid Type is Water. Select a % of ethylene glycol
flow rate GPM:
Pipe Material:
Copper, type L
Steel, Schedule 40
Pipe Size:
pipe length ft:

See Also: Engineering Units Conversion Calculator



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