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Gas Line - Can't Find The Leak

 
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Old 04-19-2007, 01:36 PM   #1
 
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Gas Line - Can't Find The Leak


'What are the tricks to finding gas leaks in a pressurized line on new construction? We are using air right now we just can't find it....Let's hear all the tricks you folks have in finding leaks.
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Old 04-19-2007, 02:48 PM   #2
 
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Re: Gas Line - Can't Find The Leak


Get a spray bottle with soap and water and spray all of the joints and make sure you leave your air test on it, you'll get a bubble at the leak or leaks , also your test gauage needle valve maybe leaking spray that as well.

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Old 05-09-2007, 05:11 PM   #3
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Re: Gas Line - Can't Find The Leak


Try using a match near all fittings.
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Old 05-09-2007, 09:32 PM   #4
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Re: Gas Line - Can't Find The Leak


could be a small hole in the body of a fitting. Took me two days to find one of those. It wasn't in the joint but the body of the fitting. I've heard of pin holes in pipe. Those are a real bitc* to find.

If you get really exasperated, take off the guage and pressure it up to 100#. You should be able to find it then, though you may blow out some of the joints.
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Old 05-12-2007, 10:57 PM   #5
 
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Re: Gas Line - Can't Find The Leak


Quote:
Originally Posted by thom View Post
could be a small hole in the body of a fitting. Took me two days to find one of those. It wasn't in the joint but the body of the fitting. I've heard of pin holes in pipe. Those are a real bitc* to find.

If you get really exasperated, take off the guage and pressure it up to 100#. You should be able to find it then, though you may blow out some of the joints.
I agree, I blow it up as much as possible, it will whistle...... Anew system should take 50-70 lbs no problem! Any plumbers in Alb New Mexico know Manuel Austin??????????
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Old 05-26-2007, 08:46 PM   #6
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Re: Gas Line - Can't Find The Leak


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Originally Posted by mottyk View Post
Try using a match near all fittings.
propane torch is faster and you dont have to keep relighting matches as they burn out and burn your fingers
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Old 05-27-2007, 10:34 AM   #7
 
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Re: Gas Line - Can't Find The Leak


Sometimes soap suds won't find a leak as happened to me one time. So on a hunch I guessed right and tighten up a union some more and that solved it. However there is a solution manufactured just for detecting gas leaks around pressurized fittings and pipe. Don't remember its name though.
If you want something more upscale, check out the combustible gas leak detectors in the Cole-Parmer catalog. I seen one for $175.00 in the 2005-2006 catalog. This instrument may also be a time saver in finding leaks fast.
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Old 05-29-2007, 06:20 PM   #8
 
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Re: Gas Line - Can't Find The Leak


They are pretty good! But I'm not sure if it's a myth, But heard from a guy that said sometimes the pipe dope can set it off from the oder of it???? Anyone ever heard of this???

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Old 05-29-2007, 07:28 PM   #9
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Re: Gas Line - Can't Find The Leak


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They are pretty good! But I'm not sure if it's a myth, But heard from a guy that said sometimes the pipe dope can set it off from the oder of it???? Anyone ever heard of this???

Michael
I have a detector, and it has never detected pipe dope as a leak that was not an actual leak. They are indispensible for finding leaks on small underground gas lines, for gas lights and such.
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Old 08-14-2007, 02:10 AM   #10
 
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Re: Gas Line - Can't Find The Leak


Just for the record......the leak detectors WILL give a false positive on some types of pipe dope.....they even pick up the gasses from sweaty feet !!!!
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Old 08-15-2007, 07:49 PM   #11
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Re: Gas Line - Can't Find The Leak


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I have a detector, and it has never detected pipe dope as a leak that was not an actual leak. They are indispensible for finding leaks on small underground gas lines, for gas lights and such.
Try putting it near a can of regular Hercules pipe dope, most of them will go off.
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Old 08-15-2007, 08:00 PM   #12
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Re: Gas Line - Can't Find The Leak


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Just for the record......the leak detectors WILL give a false positive on some types of pipe dope.....they even pick up the gasses from sweaty feet !!!!
Sorry, copy/pasted & Emailed to the mrs...next time she complains, I tell her "at least I don't set off detectors".
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Old 08-17-2007, 08:05 PM   #13
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Re: Gas Line - Can't Find The Leak


Quote:
Originally Posted by thom View Post
could be a small hole in the body of a fitting. Took me two days to find one of those. It wasn't in the joint but the body of the fitting. I've heard of pin holes in pipe. Those are a real bitc* to find.
I've seen a pipe seam leak. The Gas fitter was going nuts trying to find it, and when he did, he showed me. (Wanted a witness, I guess). A whole stick of 1/2" had a leaky seam. At least it was cut into 3 long runs all adjacent.
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Old 08-17-2007, 08:10 PM   #14
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Re: Gas Line - Can't Find The Leak


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I've seen a pipe seam leak. The Gas fitter was going nuts trying to find it, and when he did, he showed me. (Wanted a witness, I guess). A whole stick of 1/2" had a leaky seam. At least it was cut into 3 long runs all adjacent.
Foreign made pipe, US made pipe is seamless.

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