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Nitrogen for testing HPOP leaks

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Old Jul 25, 2016 | 09:17 AM
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jimdad07
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Nitrogen for testing HPOP leaks

I've been reading a ton of old threads trying to learn my new truck and was seeing a lot on air testing the HPO system. I do HVAC for a living and do a considerable amount of pressure testing but I use nitrogen. I was thinking that a guy could test with nitrogen to get the pressure up over 300psi. Any of you guys ever try that?
 
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Old Jul 25, 2016 | 09:27 AM
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WatsonR
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That is the recommend way if your leak isn't showing itself at under 120psi. Your scan gauges shows the ICP is crapping out at 320psi.... go nitrogen. Made that recommendation a few post's back.

Now if you could post a thread on how to acquire a tank and the stuff needed to do it, that would be a good read!
 
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Old Jul 25, 2016 | 09:36 AM
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Originally Posted by WatsonR
That is the recommend way if your leak isn't showing itself at under 120psi. Your scan gauges shows the ICP is crapping out at 320psi.... go nitrogen. Made that recommendation a few post's back.

Now if you could post a thread on how to acquire a tank and the stuff needed to do it, that would be a good read!
You can rent a tank from your local welding supply house, you can most likely rent an inert gas regulator as well that is adjustable. If you have to buy one eBay would be your best bet but make sure it's a high pressure reg and fully adjustable. I'm lucky enough to have a stocked work van in the driveway every night full of goodies including all the pressure testing tools.
 
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Old Jul 25, 2016 | 09:54 AM
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Worth buying a tank and gauge to keep around for such a job?
 
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Old Jul 25, 2016 | 11:30 AM
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Originally Posted by WatsonR
Worth buying a tank and gauge to keep around for such a job?
It's a good investment really for pressure testing or purging anything. I'm extremely new to this world so you guys would have to decide the cost vs. worth of having it on hand.
 
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Old Jul 26, 2016 | 01:55 PM
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Dr.Huxtable
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From: Spartanburg, SC
Originally Posted by WatsonR
Worth buying a tank and gauge to keep around for such a job?
Depends. I work at a refrigeration supply house, for residential and commercial. If you were to come into our store today and leave with a full 40lb tank and regulator you would be alittle over $225.

Keep in mind, that includes a core charge that can be refunded when you return the tank. It only cost like $13 to fill an empty one. I've seen alot of guys find tanks for cheap though at pawn shops.

My question is what fittings do you need to make this possible anyway??
 
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Old Jul 26, 2016 | 03:40 PM
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Originally Posted by Dr.Huxtable
Depends. I work at a refrigeration supply house, for residential and commercial. If you were to come into our store today and leave with a full 40lb tank and regulator you would be alittle over $225.

Keep in mind, that includes a core charge that can be refunded when you return the tank. It only cost like $13 to fill an empty one. I've seen alot of guys find tanks for cheap though at pawn shops.

My question is what fittings do you need to make this possible anyway??
It's pretty easy to rig up an air hose fitting to a regulator, I carry one in my service van for blowing out condensing coils. I'll look around and see what I can come up with.
 
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