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Obtaining & Using Dry Nitrogen

94RX-7 on Fri June 11, 2010 12:33 PM User is offline

I'm about to replace the compressor on my RX-7 and I'd like to leak test with dry nitrogen before I put refrigerant in. Can I go down to the local welding gas supply house and get everything I need to hook the cylinder up to my guages?

Is it sufficient to pressurize the system to a known number, then see if it holds pressure for 24 hours, or do I need to squirt in some R-22 and use an electronic sniffer for best results?

NickD on Fri June 11, 2010 12:46 PM User is offline

EPA lets you waste a can of R-134a for leak testing, works great with a sensitive electronic detector, least they did, figured better to waste a can then to leak out all over the world.

Much easier than fooling around with liquid nitrogen and you will also need a regulator to bring that pressure down to within reason. If using R-12, just get rid of that R-134a, and you are safe to go.

magnetchief on Fri June 11, 2010 1:04 PM User is offline

I use nitrogen for pressure testing ect. I have a small cylinder that came from a local gas supplier.
You will also need a regulating valve to drop the bottle pressure down from 3000psi to a more manageable 10-200 psi.

All these things cost, so your better off for home use with R134can and a leak detector.

Once Navy alway Navy

94RX-7 on Fri June 11, 2010 3:02 PM User is offline

Thanks guys! R-134a and a leak detector it is!

69-er on Sun June 20, 2010 11:07 AM User is offlineView users profile

Also, it seems to make sense to use R134 for leak checks because if it doesn't leak with that, then sure isn't going to leak with R12!

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