Can GPH Be Converted to PSI for Leak Testing?

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Discussion Overview

The discussion centers around the conversion of gallons per hour (gph) to pounds per square inch (psi) in the context of leak testing a 24-inch pipe. Participants explore the relationship between pressure loss and flow, particularly in a scenario where the pipe is sealed and no flow occurs.

Discussion Character

  • Technical explanation, Debate/contested

Main Points Raised

  • One participant seeks assistance in converting gph to psi for a pressure test where the pipe lost 4 psi.
  • Another participant inquires about the duration it took to lose the 4 psi, suggesting that time may be a factor in understanding the pressure loss.
  • A third participant notes the necessity of knowing the pipe volume to make any relevant calculations.
  • One participant argues that pressure can exist without flow, questioning the relationship between pressure loss and flow in this specific test scenario.

Areas of Agreement / Disagreement

Participants express differing views on the relationship between pressure and flow, indicating that the discussion remains unresolved regarding how to convert gph to psi in this context.

Contextual Notes

Limitations include the lack of information on the time frame for the pressure loss and the volume of the pipe, which may affect the conversion and understanding of the situation.

CaityAnn
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How do I convert gph to psi?...

Here is the deal, we are testing a 24" pipe for leaks doing a pressure test. the pressure at the pipe in question is 185 psi, and it lost 4 psi. I have a chart showing the allowable loss in GPH, but I don't know how to convert to PSI. Since this was a test, the pipe was plugged on both ends, therefore there was no flow.

Any help appreciated...
 
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You also need the pipe volume.
 


CaityAnn said:
...the pressure at the pipe in question is 185 psi...the pipe was plugged on both ends, therefore there was no flow.

That should answer your question. You can have pressure without flow, so how can they be related?
 

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