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DouginATL 04-05-2012 07:30 PM

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?

TheEplumber 04-05-2012 08:46 PM

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

DouginATL 04-05-2012 08:50 PM

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

TheEplumber 04-05-2012 09:00 PM

Quote:

Originally Posted by DouginATL (Post 892664)
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.

jaydevries 04-05-2012 11:03 PM

it will fail if there is a leaky faucet also


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