Pressure vessel leakage - time to equalize

[Dwarf]

Hi all, I have a problem I hope someone could help. I have a pressurized dry Nitrogen vessel. Given a known leakage rate, how long will it take for the internal pressure to be equal to atmospheric pressure?

 

[FredGarvin]

Take a look at Milton Beychok's website for a good reference on this. It's a tricky problem when considering compressible, choked flow with a varying temperature due to expansion.

http://www.air-dispersion.com/feature2.html

 

[Dwarf]

Thanks, Fred. That help.