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How Can I Calculate The Volume Of Nitrogen Required?

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#1 Engrabiolabusari


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Posted 13 July 2021 - 08:04 AM

Hello professionals in the house. How can I calculate the quantity(volume) of Nitrogen gas required to leak test a 2"line of 24m length to a pressure of 147.5barg?

#2 latexman


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Posted 13 July 2021 - 11:34 AM

That's over 4 times nitrogen's critical pressure of 32.9 barg!  It would be much safer, easier, and cheaper to just use water in a hydrotest.  Is there a reason water cannot be used?

#3 Bobby Strain

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Posted 13 July 2021 - 11:51 AM

No one in their right mind would use gas to pressure test! It's quite dangerous.



#4 Pilesar


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Posted 13 July 2021 - 12:02 PM

Leak tests are generally done at much lower pressures after maintenance and during recommissioning. Even though your line is rated at such high pressures, all that may be needed for a leak test is to pressure the line to perhaps 5 barg and block the line in to check whether the pressure drops over time.

#5 breizh


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Posted 13 July 2021 - 06:38 PM

Hi ,

Safety first , forget about using high pressure gas for leak test ! this is too dangerous .

If possible use water and handpump to perform the task .

The use of gas can lead to fatality , I'm aware of one case .


Good luck


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