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  • Help on Formulas

    I need to find a formula on take offs for threaded pipe for 90s, 45s and tees. Somebody please help! A sample question of what I am looking for is; A 2" pipe is being cut to run between 2 90-degree threaded fittings. The center to center measurement of the fittings is 7'2-1/4". What is the cut length of the pipe?

  • #2
    Re: Help on Formulas

    There is no formula for getting take offs...you either measure the fittings...or get the manufacturers specs.

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    • #3
      Re: Help on Formulas

      Some plumbing text's give fitting make in tables but they are only a rough estimate as fitting manufacturers vary. I have found the tables to be pretty close though.
      sigpic

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      • #4
        Re: Help on Formulas

        very simple. measure the actual brand of fitting and get an accurate measurement. no real formula, just a tape measure and good threads.

        center to center and end to center are the main ones.

        rick.
        phoebe it is

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        • #5
          Re: Help on Formulas

          IPT Pipe Trade's Hand Book is an invaluable resource of hundreds of tables and formulas. Find it at www.pipefitter.com
          the dog

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          • #6
            Re: Help on Formulas

            Thanks for the heads up there Dog, there was something there that I wanted.
            Great Link for a Construction Owner/Tradesmen, and just say Garager sent you....

            http://www.contractorspub.com

            A good climbing rope will last you 3 to 5 years, a bad climbing rope will last you a life time !!!

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            • #7
              Re: Help on Formulas

              Dang, finally found a plumbers rule at Pipefitter.com

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              • #8
                Re: Help on Formulas

                that in my opinion has to be field verified, there are differences between domestic and asian black iron thread tolerance. understanding proper structure of a threaded joint will add to success.

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                • #9
                  Re: Help on Formulas

                  Steamfitter Local 638 I will tell you want I was told in school get a black franklin book.
                  Are you work with steam fittings

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                  • #10
                    Re: Help on Formulas

                    1/2 and 3/4 face to face and add 1 inch, 1 to 2 face to face and add 1 1/8". Comes out right tahats what counts.
                    WE LIVE IN THE LAND OF THE FREE,
                    ONLY BECAUSE OF THE BRAVE

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                    • #11
                      Re: Help on Formulas

                      On carbon steel and ss for a 90 degree Long Radius Elbow it's one and one half the pipe diamanter, a 45 it's five eights the pipe size and a short radius 90 is the same as the pipe size

                      like for 6 inch

                      LR 90 6X1 1/2=9

                      45 5/8X6=3 3/4

                      SR 90 1X6=6
                      Life is Good, OleTom
                      http://ConstructionWorkers.US

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