08-27-2009, 11:10 AM
I retired from work as a transport refrigeration mechanic, and have a small set of tanks with dry nitrogen that I used for leak checking refrigeration units. The dry nitrogenis the same stuff NASCAR race teams use in their tires. The tanks, cart, and pressure regulator cost about $400.00 if I remember correctly, but the cost to refill with dry nitrogen to 2500# is very cheap. I think it was about $10.00 per bottle the last time I had them filled.