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What is the flow rate of water through .75 inch pex pipe at 40 psi in gpm?
Wiki User
∙ 11y ago
The standard formula to calculate flow(GPM - gallons per minute) from a CIRCULAR orifice is:
29.7 * (the square root of the pressure) * (the square of the diameter of the flow orifice)
EXAMPLE using 3/4" Pex Pipe(actual I.D. of 3/4 PEX Pipe is .677") and 40 PSI pressure:
29.7 * 6.325(sq. root of 40) * .458(the square of the I.D. 3/4" pipe) =
A GPM of 86.03
Note: You also need to account for fittings in the loss calculations; while minimal several fitting will make a difference.
Wiki User
∙ 11y ago
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