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Problem with blk iron unions

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  • Problem with blk iron unions

    I seem to have a problem getting unions to seal. 300 lbs unions 2" I've been putting never cease on the threads and that don't seem to help. Anyone got more tricks?
    If you don't know, ASK!

  • #2
    Re: Problem with blk iron unions

    Is it leaking from the threads or the union

    Comment


    • #3
      Re: Problem with blk iron unions

      Maybe sand holes in castings. I always use Galvy with black for this reason. switch
      I can build anything You want , if you draw a picture of it , on the back of a big enough check .

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      • #4
        Re: Problem with blk iron unions

        Sometimes I use a O-Ring or even make a ring gasket out of rubber or whatever depending what is in the system.

        most of the time I just use heavy Greese
        Life is Good, OleTom
        http://ConstructionWorkers.US

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        • #5
          Re: Problem with blk iron unions

          What's "galvy"?

          Jonesy

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          • #6
            Re: Problem with blk iron unions

            galvanized
            Buy cheap, buy twice.

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            • #7
              Re: Problem with blk iron unions

              there are a lot of cheep Taiwan and they are crap . i use pipe dope on the threads and on the in side of the union

              where is the leak coming from is it coming from the back side of the union nut then it could be the seat . what are you piping
              Charlie

              My seek the peek fundraiser page
              http://observatory.mountwashington.o...nal&fr_id=1040


              http://www.mountwashington.org/weather/conditions.php

              new work pictures 12/09
              http://public.fotki.com/hvachawk/

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              • #8
                Re: Problem with blk iron unions

                The union threads, not the pipe threads. I'm piping steam, using a complete set and am already using 3' wrenches
                Last edited by Mech; 06-17-2008, 06:33 PM.
                If you don't know, ASK!

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                • #9
                  Re: Problem with blk iron unions

                  You arent mix and matching the two halves are you?
                  West Trail Mechanical Ltd
                  Service. Commitment. Expertise.

                  www.westtrailmechanical.ca

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                  • #10
                    Re: Problem with blk iron unions

                    do you know what brand

                    you can try 3ft wrenches
                    Charlie

                    My seek the peek fundraiser page
                    http://observatory.mountwashington.o...nal&fr_id=1040


                    http://www.mountwashington.org/weather/conditions.php

                    new work pictures 12/09
                    http://public.fotki.com/hvachawk/

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                    • #11
                      Re: Problem with blk iron unions

                      No, I use a complete set and I am already using 3' wrenches.
                      If you don't know, ASK!

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                      • #12
                        Re: Problem with blk iron unions

                        Overtightening will gall the brass seat and cause the union to leak. Make sure the mating surfaces are clean and free of scratches and nicks. Make sure the two halfs align and are touching each other. Put either oil or wax on the union threads and tighten with 2" wrenches.
                        sigpic

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                        • #13
                          Re: Problem with blk iron unions

                          i only said 3ft wrenches because i have some small helpers and they just cant do it with 2ft . i did show them i can do it with an 18" wrench ,im a little bigger then them .


                          how different unions did you try
                          Charlie

                          My seek the peek fundraiser page
                          http://observatory.mountwashington.o...nal&fr_id=1040


                          http://www.mountwashington.org/weather/conditions.php

                          new work pictures 12/09
                          http://public.fotki.com/hvachawk/

                          Comment


                          • #14
                            Re: Problem with blk iron unions

                            how's your alignment ? how's your seats ?

                            Comment


                            • #15
                              Re: Problem with blk iron unions

                              Who makes them and where. The only reason I ask is because I was on the phone yesterday with Anvil. There one of the largest manufactures of Cast Iron fittings in the United States. They literaly carry two catelogs now. The products made in the US and the Crap made in India and China. Without openly admitting it they recommend the US made stuff, lot more money but guaranteed to work out of the box.

                              Every time we get involved with Unions, ball valves, butterfly's etc... we make it a point of buying nothing but the best. Even then you have to be careful. For example Nibco. They have there quality Italian made products and there knock-off Chinnese.

                              When we provide CAD drawings for a project were we are supplying the equipment we specificy that all bypasses, connections, are to be Nibco-Italy or equivelant. No Chinnese, Indian, or Pakistan fixtures.

                              Nothing eats up money faster then a leaking Union. I have been on projects were we wasted hours trying to stop a leak.

                              We used a product years ago to deal with the identical issue your having. I'm having a hard time rembering the name of the product I believe it's either Hurk or make by Hurk, something like that. (I am sure someone will chime in here with the right answer) I have heard it referred to as Monkey Snoot. It was thick gooey and dark green in color. This stuff will seal a whales A$s water tight.
                              Last edited by Watersurgeon; 06-18-2008, 08:34 AM.

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