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1.5" sweat

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  • 1.5" sweat

    Hey Guys,

    New to the forum here. I have a large amount of rental property and have been doing the plumbing work myself for some time now. About 4 months ago I replaced a 1.5" Hoffman mixing valve on one of my boilers and I sweat it in. Everything has been holding up great and no leaks.

    My question is should I have brazed the piping due to the size and water volume demands? I used sterling solder.

    When do I braze as opposed to solder? And I will need different gas than MAP for brazing right?


    **EDIT** Sorry I meant to post this in "Ask the Plumber"
    Last edited by Hosh; 05-11-2010, 10:35 AM. Reason: Incorrect area

  • #2
    Re: 1.5" sweat

    Solder for your situation was appropriate. I like to "tin" the pipe on
    anything 1.5" and over. Silver solder requires acetylene to get the
    higher temp. About the only time I use it is underground or something
    weird like a t-drill connection (hardly ever, anymore) or HVAC line (which
    I don't do, anyway). The fact that it don't leak says it all.


    • #3
      Re: 1.5" sweat

      Brazing is used on air conditioning & refrigeration. I used to solder 3 & 4" copper. And I used to braze 3 & 4" copper. I used to tin the copper on 3" and up when I solder. when brazing you need oxygen & acetylene for those big pipes.


      • #4
        Re: 1.5" sweat

        Okay thanks guys. Sounds like I will be alright with the solder. It was the biggest pipe I've ever soldered so wanted to make sure that I wasn't supposed to do something different. I vaguely remember someone telling me about brazing and saw brazing rods at home depot so it got me thinking.

        What do you mean by "tinning" the pipes?


        • #5
          Re: 1.5" sweat

          Tinning is cleaning, fluxing, heating and applying solder to the end of the pipe
          to be fitted. Completely cover with solder and wipe excess with a dry rag
          so the fitting can be affixed and solder as usual. This method assures even, consistent coverage of the solder in the joint.


          • #6
            Re: 1.5" sweat

            That's interesting, I hadn't heard of that. I'll have to try it for practice soon, thank you.

            Out of curiosity, I went and picked up a cutting/brazing torch kit last night and ohhh man is that a big difference! haha.. . Now I need to find something to cut soon.


            • #7
              Re: 1.5" sweat

              Yea you need to practice brazing or you will be cutting thru your copper pipes the same way.


              • #8
                Re: 1.5" sweat

                It is possible to braze with MAPP gas.
                Brazing water pipes is only required when the pipe will be laid under a slab or if you are creating a tee fitting in the pipe wall.