Nitrogen Pressure for leak detection

YZ490 on Wed May 16, 2012 11:27 PM

Year: 88
Make: International
Model: 9300
Engine Size: Big Cam4
Refrigerant Type: R 134
Country of Origin: United States

According to the makers of Big Blu in there Leak Detection Manual they say " Pressurize the low side to 150 psi and the high side to 450 psi using dry Nitrogen, Helium or dry air. If the high and low sides cannot be split by way of isolation valves, pressurize the entire system to about 350 psi. " But they are working on a home a/c system, So are those pressure's also for automotive or what should it be. Thanks Steve.

TRB on Thu May 17, 2012 12:55 AM

150 PSI should be more than enough to trace down a leak.

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YZ490 on Thu May 17, 2012 4:14 AM

Thanks TRB, 1 more question this is my first o ring system are they suppose to be better than a flare. Never had any problems on the flare systems but this o ring system has been nothing but problems. Converted from R12 to R134 by replacing everything except condenser and evaporator, I have all new o rings along with applying nylog to everything including the threads, put in some nitrogen ran a couple of days on the job and found the hoses around the compressor loosened up I guess from the engine vibration and nylog on the threads. It's a class 8 Dump Truck with a big Cummins which they do have some vibration so basically would a flare system be better. Thanks Again.

TRB on Thu May 17, 2012 2:33 PM

I never had issues with he flare setup.

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HECAT on Thu May 17, 2012 4:57 PM

O-ring and other fluid & gas connections, which use a captured soft seal; maintain the seal longer under the vibrations and loads encountered in mobile vehicles of all kinds. This is why more and more different types of fluid & gas connections are adopting such sealing technology and moving away from the traditional metal to metal type seal (NPT, Flare, Ferrule bite, etc.).

Flare system would not be better, but in many cases it will work well.

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Edited: Thu May 17, 2012 at 4:57 PM by HECAT

TRB on Thu May 17, 2012 7:14 PM

Quote
Originally posted by: HECAT
O-ring and other fluid & gas connections, which use a captured soft seal; maintain the seal longer under the vibrations and loads encountered in mobile vehicles of all kinds. This is why more and more different types of fluid & gas connections are adopting such sealing technology and moving away from the traditional metal to metal type seal (NPT, Flare, Ferrule bite, etc.).

Flare system would not be better, but in many cases it will work well.

I'm sure you have your Data correct Mr. Cat. But I remember a lot less leaks back in the day of a flare connection and a little lube.

-------------------------
When considering your next auto A/C purchase, please consider the site that supports you: ACkits.com
Contact: ACKits.com