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Juan Flores
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Join Date: Mar 2020
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Pressure Temperature Correction

03/30/2020 6:22 PM

Dear All . I have an interesting question for myself and I can't find literature about it

When we perform hydrostatic pressure tests on the pipe we always have the problem of determining when the test fails, that is, as we show that the pressure drops due to temperature.

On the internet I found the following equation but it does not indicate where it was obtained, please someone to help me with your criteria .. thanks
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SolarEagle
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#1

Re: Pressure temperature Correction

03/30/2020 6:52 PM

What are the relevant code requirements? Is this API? How long are you holding the pressure test for?

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phoenix911
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#2

Re: Pressure temperature Correction

03/30/2020 7:00 PM

It’s been quite some time since I did any ASME, if I recall, it’s you that determines that in you SOP’s, it has to be reasonable. Which is open ended ended requirement, that you need to follow.

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Juan Flores
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#3

Re: Pressure temperature Correction

03/30/2020 8:19 PM

The standard that applies is Asme B31.4 or Asme B31.3 in the first case the test time is from 4 to 12 hours for buried pipe and in the second from 10 minutes onwards, but the customer always needs to be technically support because it lowers the pressure according to the temperature
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SolarEagle
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#4
In reply to #3

Re: Pressure temperature Correction

03/31/2020 12:43 AM

https://physics.stackexchange.com/questions/363328/water-pressure-vs-temperature

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Juan Flores
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#5

Re: Pressure Temperature Correction

03/31/2020 11:59 AM

The standard that applies is Asme B31.4 or Asme B31.3 in the first case the test time is from 4 to 12 hours for buried pipe and in the second from 10 minutes onwards, but the customer always needs to be technically support because it lowers the pressure according to the temperature once test pressure is reached and time is allowed to run
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SolarEagle
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#6
In reply to #5

Re: Pressure Temperature Correction

03/31/2020 1:24 PM

..."rule for water is that pressure in a water-solid system will increase about 100 psi for every 1 F increase in temperature."...

So it's my understanding that the pressure test is done well in excess of the operating pressure and held at that pressurized state for a length of time...as it cools you pump more water in to maintain the pressure until the water temperature in the pipe is in equilibrium with the ambient temperature....

https://www.engineersedge.com/thermodynamics/effect_temp_fluid_prop.htm

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gutmonarch
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#7

Re: Pressure Temperature Correction

04/02/2020 11:34 AM

You should review your thermodynamic properties. Consult a mechanical engineer on this.

If you are one, what made you pass licensing exam?
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gutmonarch (1); Juan Flores (2); phoenix911 (1); SolarEagle (3)

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