Volume of Nitrogen for Leak Testing
Volume of Nitrogen for Leak Testing
(OP)
I need to leak test a 10" - 100 meter long pipe at 20 Barg with Nitrogen
What is the volume of nitrogen required for this leak test.
Any calculation basis will be much helpful
Thanks
shaff
What is the volume of nitrogen required for this leak test.
Any calculation basis will be much helpful
Thanks
shaff





RE: Volume of Nitrogen for Leak Testing
This is pretty basic gas law stuff.
My motto: Learn something new every day
Also: There's usually a good reason why everyone does it that way
RE: Volume of Nitrogen for Leak Testing
RE: Volume of Nitrogen for Leak Testing
Does your procedure require any purge to get rid of the residual air in the original pipe and equipment? (Remember you will need to add all vent and drain lines, valves, tanks, pumps, filters, ...)
RE: Volume of Nitrogen for Leak Testing
Racookpe - Did you mean contract instead of expand?
My motto: Learn something new every day
Also: There's usually a good reason why everyone does it that way
RE: Volume of Nitrogen for Leak Testing
If the original poster wants to leak test a pipe originally filled with air at 0 bar (gage), then he's going to connect a high pressure room temperature HP bottle of N2 up right?
Then that bottle's gas will expand into the low-pressure pipe, drive out the old low pressure air (at 1-4 psig over ambient pipe pressure) until he stops purging the N2 out. With the purge valve now shut, then I figured the HP N2 bottle's gas would expand into the pipe and equipment volume until the pressures equalize. The bottle's gas and the pipe's gas would now be cooler than before since all of the heat of compression (from bottle pressure to equalized pressure) of the gas in the pipe would almost immediately be lost through the pipe walls and supports and the pipe thermal mass.