PVC Pipe Flow Rate: Calculating Flow Through 1/2" Schedule 40 Pipe at 65 PSI

For a 1/2 inch (0.5 inch) Schedule 40 PVC pipe with an inside diameter of approximately 0.622 inch, the flow rate at a pressure of 65 PSI (pounds per square inch) can be estimated using the following formula:

Flow Rate (GPM) = [(Pressure in PSI) * (Pipe ID in inches) ^ 2.63]/53.3

Flow Rate (GPM) for 1/2 inch PVC pipe at 65 PSI = [(65 PSI) * (0.622 inch) ^ 2.63]/53.3

Flow Rate ≈ 1.14 GPM (gallons per minute)

This flow rate represents the maximum theoretical flow rate under ideal conditions. In practice, the actual flow rate may be slightly lower due to factors such as friction losses and pipe fittings.