How do I convert gph to psi?

[CaityAnn]

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...

 

[russ_watters]

How long did it take to lose 4psi?

 

[Q_Goest]

You also need the pipe volume.

 

[zgozvrm]

...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?

 

[alphy]

Converting from gallons per hour (gph) to pounds per square inch (psi) requires knowledge of the specific gravity of the liquid being tested. Once the specific gravity is known, the conversion can be done using the following formula:

psi = (gph x 8.33) / (specific gravity x 60)

In this case, since the pipe was plugged and there was no flow, the specific gravity can be assumed to be 1 (the specific gravity of water). Using this information and the given values, the conversion would be:

psi = (4 x 8.33) / (1 x 60) = 0.555 psi

Therefore, the allowable loss in psi would be 0.555 psi for this test. It is important to note that this is a general conversion and may not be accurate for all liquids. If you are testing a different liquid with a different specific gravity, the conversion may be different. It is always best to consult a conversion chart specific to the liquid being tested for more accurate results.