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Thread: sealing gas pipe threads ?

  1. #1

    Default sealing gas pipe threads ?

    hello. sorry for such a newbe question. but i have never messed with gas pipes. my hwh started leaking. so i am about to replace it. it is natural gas. is plumbers putty good for the threads ? if not, what ?

    if there is anything you would like to add to a first time 40gl gas hwh swapper ?!


    thanx

  2. #2
    Moderator & Master Plumber hj's Avatar
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    One word of advice, "Do not depend on the original installation to meet current installation requirements". You cannot always put the new one in just like the old one was, and if you think plumber's putty is a proper thread sealant for ANYTHING, especially gas, then you have NOT done much piping.

  3. #3

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    Quote Originally Posted by hj View Post
    One word of advice, "Do not depend on the original installation to meet current installation requirements". You cannot always put the new one in just like the old one was, and if you think plumber's putty is a proper thread sealant for ANYTHING, especially gas, then you have NOT done much piping.

    yeah. i can't count the # of code violations i have had to repair from the builder. i think the code officer was in the pockets of the builder.

    ok, then what should i use ? i forgot to get a pan when i baught the richmond hwh yesterday. so i have to go to HD anyway.

    thanx

  4. #4

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    oh, btw.

    GREAT state you have there ! that stuff WOULD NOT happen here in il.

  5. #5
    Moderator & Master Plumber hj's Avatar
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    I wouldn't say that, but any pipe joint compound will seal the threads.

  6. #6
    DIY Senior Member asktom's Avatar
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    Fill the WH with water and purge the air from the system before you fire it up.

  7. #7
    Plumber jimbo's Avatar
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    Back to the question>>> plumbers putty is never used on threads of any kind. PIPE DOPE, also called pipe thread paste, is what to use. Great White, Megaloc, Rectorseal Tplus2, are some good ones.

  8. #8
    Master Plumber-Gas Fitter shacko's Avatar
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    Don't forget to use a soapy water solution on the gas pipes when you turn the gas back on, we want zero leaks

  9. #9

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    thanx guys.

    WH is in. i put a pan/drain in.


    i flushed the living poop out of it. i would say at least 100 gallons.
    i used Tplus2.
    i soaped up the joints. no leaks.
    and new dielectric fittings and a new shut off valve.


    idk what kind of sealer the builder used. but it sure looked like plumbers puddy.


    i have another question. on the in/out fittings of the WH. there is a blue plastic gasket (for lack of a better term). what is that for ?

    thanx
    Last edited by Fabricator; 05-02-2010 at 06:08 PM. Reason: to add

  10. #10
    Plumber jimbo's Avatar
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    If you are talking about the nipples that often come pre-attached to the water heater, the blue is a plastic dielectric lining to prevent corrosion of the outlet fitting.

  11. #11
    Moderator & Master Plumber hj's Avatar
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    quote; the blue is a plastic dielectric lining to prevent corrosion of the outlet fitting.

    That is what it is SUPPOSED to do, but seldom does it.

  12. #12

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    yes, the pre-attatched nipples. i looked down in these nipples. there looked to be some kind of valveage down there about 2"s. what is that for ?

    thanx guys

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