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Tool Talk Discussion Forum

O.T.- Pressure testing plumbing

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1945 A

03-28-2006 09:10:22




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I"m about ready to hook up the water system to my little cabin project, but want to pressure test it first with air to see if there are any leaks.
Is there some type of kit or something to do this with? How much pressure should I test with.
The lines are all 3/4" CPVC.
Thanks in advance for any help/insight!




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TopCat

03-29-2006 05:48:15




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 Re: O.T.- Pressure testing plumbing in reply to 1945 A, 03-28-2006 09:10:22  
Just a thought wouldn't pressure testing plastic piping with air pose the same risks of catastrophic failure as using the same piping for shop air use? The enclosed space under a house would be a bad place for this to occur(duct work, wiring, etc...) I would slowly fill the system with water and then with a guage bring up the pressure. just a thought.



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Can't even use my name

03-29-2006 16:52:19




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 Re: O.T.- Pressure testing plumbing in reply to TopCat, 03-29-2006 05:48:15  
As long as you don't excede the max pressure of the pipe, NO. Problem with using it for air systems is you get a lot of vibration and shock loads and heat at the start of the piping. Plastic will eventually possibly shatter, especially when cold.



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Can't even use my name

03-28-2006 14:35:26




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 Re: O.T.- Pressure testing plumbing in reply to 1945 A, 03-28-2006 09:10:22  
I used copper pipe so I had considerably more of a chance of a leak, I'm not a pro yet! Only had two leaks, one small drip and one I forgot to sweat. Anyways, I took a 3/4" plastic cap and drilled a hole in it where I installed a tubeless tire valve stem, aka a schrader valve. Fill it up from the air tank to 100 pounds. Took some soapy water and sprayed all the joints and shutoffs. Will make bubbles if it leaks.

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Bill in NorthCentral Pa

03-28-2006 12:53:35




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 Re: O.T.- Pressure testing plumbing in reply to 1945 A, 03-28-2006 09:10:22  
They make an air fitting similar to a valve stem. I usually spin in a pressure gauge somewhere, air it up, and leave it overnight.

Good Luck,

Bill



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Dusty

03-28-2006 09:19:32




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 Re: O.T.- Pressure testing plumbing in reply to 1945 A, 03-28-2006 09:10:22  
I'm not an expert but on most well systems the pump turn off at 50lb. so I would test for more than that. what is the CPVC rated at? Test some where between those two.

Dusty



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rhouston

03-28-2006 12:43:29




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 Re: O.T.- Pressure testing plumbing in reply to Dusty, 03-28-2006 09:19:32  
when I saw someone do it they put a air gauge and a compressor quick connect on the end of the pipe. It was then pumped up to almost 100 PSI. then left overnight. It the pressure stayed up overnight then the pipes were considered good. They used the same process for Gas pipes as well. Don't put more pressure in the pipes than they are rated for. The PSI rating should be printed on the side of the pipe

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