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  1. #1
    Join Date
    Dec 2001
    Location
    Cartersville Ga
    Posts
    1,035
    we do a LOT of new construction (41 roughs next week)
    apparently fulton county georgia inspects the gas line on the final. now the sheetrock is up, finished and painted, and we have a leak in the line. the guy who should have caught it before sheetrock quit and this one fell through the cracks. they cut 15 holes in the sheetrock yesterday where the joints were, (and a few other places) and could not find it.

    used nitrogen, ran it up to 75 to see if they could hear it, no luck.

    i gotta go out there monday. got any ideas?

    In the land of the blind the one eyed man is King! semper fi

  2. #2
    Join Date
    Mar 2005
    Location
    RALEIGH
    Posts
    39
    Bring some matches.......problem solved!

  3. #3
    Join Date
    Jun 2003
    Location
    New Hampshire
    Posts
    2,666
    Tell the guy who quit what happened. It'll put a smile on his face.

  4. #4
    Join Date
    Dec 2002
    Location
    Toledo, Ohio, United States
    Posts
    12,910
    It's been awhile but I have seen holes in fittings....elbows
    and tees so don't overlook them.

    Important ????? is it a slow leak or fast leak? Is it leaking in LBs or Inches?

    Could a shut off be leaking thru?
    No Heat No Cool You need Action Fast

  5. #5
    Join Date
    Jul 2004
    Posts
    109
    I would bet money that your using fittings that say made in china on them. Seems like every job I do has at least one leak since our supplier quit carrying ward fittings and switched over to those "made in china" fittings. I cant find anyone in town that carrys any usa made fittings. Lately what I have been doing is using wardflex and making a manifold and installing it in the mechanical room. No fittings are covered up and gas piping is speed up. Good luck finding that leak.

  6. #6
    Join Date
    Jan 2005
    Location
    Seattle
    Posts
    191

    Lightbulb Gas Piping Leak Detector

    hvac4u.
    Make your self up one of these little buggers.I used a old torch head I had.Cut off the end were the flame would have come out.Put on 2' or 3'of 3/16"(ID) rubber hose with a stainless steel clamp.On the othere end of the hose put on a air chuck(like you would use to fill up a tire)This will let you introduce a little LP into the gas piping though the gage.You don't need all that much LP in there but some anyways.Go to the end of all the branches of the piping and bleed the thing out tell you get a wiff of LP.Now you go to the truck and get out your combustible gas detector.Crank that thing up and go very slowly across all the fittings.AS was said before There are a lot of fitting make in othere parts of the world that have pin holes in them from the castings.This might sound a little weird but it works very well.If you have a very slow leak and the detector only gets you close.Then you can use that spray bottle of soapy water and wait.I have had large systems that had a leak in the one pound loss over a day and a half.That I played hell finding(hours)Because a very small leak can take five or ten minutes to start makeing enough bubbles to see with the flashlite.Best of luck.I will keep eye on this post to see if you understand what I discribed makes sence to you.
    Man do I feel your pain!!!
    41GASMAN.


  7. #7
    Join Date
    Aug 2004
    Location
    S.E. Pa
    Posts
    6,179

    CSST

    Sounds like a sales pitch for CSST; one joint on this end and one joint at the other.

    If the AHJ won't let you introduce LP into the system, try an ultrasonic leak detector. Only works for larger leaks. I guess you could pipe in water and look for the flood...sorry, couldn't resist. You could pipe in refrigerant but the EPA would bust you for that..
    How about a smoke bomb? Oh, yeah after 9/11 they are called smoke generators...

    If you use soap bubble solution, make sure it is non-corrosive or wash the hell out of it so it doesn't cause stress cracks.

    Worst case, you could cut a few branches and localize the leak. Good luck!

  8. #8
    Join Date
    Feb 2003
    Location
    Huntsville,AL
    Posts
    4,125
    that is why I use Loctite on ALL threaded connections! stops leaks, prevents corrosion, prevents back- out of bolted connections, especially due to vibration.

  9. #9
    Join Date
    Jan 2005
    Location
    Seattle
    Posts
    191

    CSST

    I got to say csst is some pretty cool stuff.BUT...It looks like sh!t.With the price of the tubing and the fitting it can be pretty stupid to use it in a lot of applications.As far as looks go it just looks like the kid next door did it.And with the rules on it's use with the heat treated cover plates it can get pretty pricey.BUT(theres that word again)If I am running gas pipe in a crawl on a retrofit job well your dam right that whats going into the place.Besides if a guy can't install a job in hard pipe with out having leaks all over WELL..... maybe you should see how the guy does at installing a bunch of flex ducting for you local competitor.To be honest it took me awhile to get the feel for how tight was tight enough.Probably run in the 98 to 99 percent no leaks the first time now though.Those first jobs sure were hard on me though.When you have to take half of the system apart to fix a leak.You start to learn pretty quick.Besides hard pipe maks it look like you know what your doing.Because you DO!!!!
    41GASMAN

  10. #10
    Join Date
    Mar 2005
    Posts
    157
    I agree with hearthman. Might have to isolate branches or sections. Process of elimination. I've had some of those less than desirable jobs. Just have to tell yourself it won't be easy and give yourself alot of time, and try not to think of where you have to be next. Good luck.

  11. #11
    Join Date
    Dec 2001
    Location
    Cartersville Ga
    Posts
    1,035
    41gasman, i have a very good combustible gas detector, and the meter is set so i will hook it up and look. good idea.

    all fitting do say china, new construction, go figure. builder is in top 5 largest in USA, so i am sure we were not the high bidder...

    thanks for the advice
    In the land of the blind the one eyed man is King! semper fi

  12. #12
    Join Date
    Mar 2004
    Location
    Grottoes VA
    Posts
    5,856
    Why can't you use ref. to check for a gas leak? You can use it in a system to check for a leak and ca legally vent it. You only need a little bit and you can use nitrogen to increase the pressure. Just don't use R-410A and your air compressor...................can you say boom.
    Karst means cave. So, I search for caves.

  13. #13

    Angry

    Originally posted by cem-bsee
    that is why I use Loctite on ALL threaded connections! stops leaks, prevents corrosion, prevents back- out of bolted connections, especially due to vibration.
    Yeah, Loctite makes it REAL nice for the next guy. Nothing like having to pull out the Sawzall just to change a gas valve.

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