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  • #76
    Re: Pipe Dope

    NFPA 13 says screwed unions shall not be used on pipe larger than two inch.

    I hardly ever use a union except for small stuff (1/4" to 1") the rest is grooved couplings.

    Actually if you read NFPA 13 and take it literally then you can only use dope OR tape, not both. ..............joint compound or tape shall be applied only to male threads.

    Can buy teflon paste dope in 55 gallon drums.


    • #77
      Re: Pipe Dope

      Teflon is not allowed on gas lines here.

      The only time I use teflon, is if the product I'm using calls for it. The only time I have ever used teflon and pipe dope together, is on boilers or steam lines.

      Like everyone else...the teflon goes on first...then the pipe dope.