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Old 04-05-2012, 08:30 PM   #1
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Air test old plumbing


I am buying a foreclosure and the property condition report states that the plumbing does not hold pressure. I want to air test the plumbing myself to determine if there is actually a problem. The pipe is copper. I have extensive experience in the construction/remodeling industry and now work in the natural gas industry, so ability is not an issue. Finding gas leaks is part of my job. I am looking for suggestions on what pressure to test at? Where to test (I am thinking the laundry connections)? I am also thinking that the problem is likely a bad valve... Thoughts?

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Old 04-05-2012, 09:46 PM   #2
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Air test old plumbing


I'd test up 1.5 times working pressure. Treat it like testing gas-isolate fixtures as much as possible. Washer box sounds good- you can test hw lines or cw lines. I'd leave the test on for an hour too

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Old 04-05-2012, 09:50 PM   #3
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Air test old plumbing


How would I find out the working pressure? I am also worried about overloading the valves. I have seen where people have recommended testing between 75-100PSI. Is that too much? Any idea what the plumbing code says? Am I overthinking it?

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Last edited by DouginATL; 04-05-2012 at 09:52 PM. Reason: just a thought
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Old 04-05-2012, 10:00 PM   #4
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Air test old plumbing


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Originally Posted by DouginATL View Post
How would I find out the working pressure? I am also worried about overloading the valves. I have seen where people have recommended testing between 75-100PSI. Is that too much? Any idea what the plumbing code says? Am I overthinking it?

Thanks
I would test between 60-100. Working pressure is ideally around 60. Check to see if you have a PRV at the building supply shut off. You may want to remove it for the test. Treat it like a gas valve- not sure if you should back test against it. I would test the hose first, then test the service line- process of elimination. Hopefully the leak is in the house and not buried outside.
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Old 04-06-2012, 12:03 AM   #5
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Air test old plumbing


it will fail if there is a leaky faucet also
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