Air pressure testing loop with CO2

gwertheim

n00b
Joined
Jan 21, 2020
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15
This might be a stupid question but when you do a dry pressure test with air, can you use a co2 cartridge instead? Will it damage anything if I open the valve a quarter?
 

Tsumi

[H]ardForum Junkie
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Mar 18, 2010
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13,187
Almost no one does a dry pressure test. Typically people will run the pump on a separate power supply with the main system powered off, put paper towels underneath the connections, and let it run for a day and see if there are any leaks.

The maximum pressure put out by a 355 pump is about 8 PSI. Two of those can do 16 PSI, and that's the highest pressure you will ever see in a system. A CO2 cartridge is 853 PSI... I would say you are running a high risk of damaging something by using one. Just do the one day leakage test.
 

Nimisys

Likes To Play With Trannies
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Jun 20, 2000
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17,796
If the pressure is too high you'll blow out a seal/o-ring/gasket. Doesn't matter what the gas is (assuming not caustic), too much pressure will find a way out.

I have ran a vacuum test successfully.before however.
 

VanGoghComplex

[H]ard|Gawd
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Apr 5, 2016
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1,880
As others have said, this is a quick way to damage a loop.

I've seen people do the blow test, where they'll blow into a hose attached to the loop and see if it holds pressure against their lungs. Probably good enough to see if you left any fittings loose or disconnected, but not likely to find pinhole leaks due to a cut o-ring or the like.
 

SticKx911

2[H]4U
Joined
Mar 14, 2004
Messages
2,286
I tried to nitrogen test a radiator to less than 100psi.(was considering using for 134a to make a phase change loop) and it blew the rad up like a balloon. All the copper and fins swelled...so yea, don't do that. Lol

Any reasonable positive pressure to do any real dry testing will be too much or you need some real good equipment to measure very small pressure decay off say 20psi or so.
 
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