Leak rate conversion with different gases
Leak rate conversion with different gases
(OP)
Hello,
I have a requirement for a max leak rate with He in a pressure vessel (1e-4 mbar*l/s). I want to test it with pressure decay method, but using Nitrogen instead of He. What is the correct calculation of leak rate using Nitrogen, and the translation in max pressure decay (mbar/s)? The internal volume is 0.2 l.
Thanks
Marco
I have a requirement for a max leak rate with He in a pressure vessel (1e-4 mbar*l/s). I want to test it with pressure decay method, but using Nitrogen instead of He. What is the correct calculation of leak rate using Nitrogen, and the translation in max pressure decay (mbar/s)? The internal volume is 0.2 l.
Thanks
Marco





RE: Leak rate conversion with different gases
RE: Leak rate conversion with different gases
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RE: Leak rate conversion with different gases
The excellent post by unclesyd succinctly gives the information on how to convert between the two gases. The equally excellent post by JDmagnet provides an explanation of why making such conversion may not be allowable (or even wise, depending on the service.) Hopefully cavva78 will not ignore the warning that just because s/he can convert the leak rate doesn't mean that s/he should.
Patricia Lougheed
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RE: Leak rate conversion with different gases
Good point. As long as the l/d is in or near the viscous flow range, there is no problem with molecule size. If you are in or near the molecular flow range than caution is warranted.