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Here is one for you math nuts

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  • Here is one for you math nuts

    A 4" pipe is set at a 45 degree angle,
    is 100' long,
    is full of water,
    and has a clog at lower end.

    What would the PSI be at the point of the clog?

    According to my math the clog would be holding 453.071 pounds worth of head.
    What would that be converted to PSI?

    I tried to convert it, but I only have 10 fingers and 10 toes and I lost count at 19
    INSIGHT PIPE is now Maine Drain Serving most of ME with no charge for travel! 207-431-6232 is nolonger a working # our NEW # is 207-355-1476
    Sewer main snaking (roto rooting). Sink clogs. Sewer backup. Pipe inspection/locating. No Dig trenchless repair. Root clog removal.We are NOT to replace your local Plumber, as we do not do plumbing. WE ARE YOUR DRAIN CLEANING EXPERTS!!! www.sewermaine.com waterville winslow bangor augusta skowhegan fairfield pittsfield oakland

  • #2
    Re: Here is one for you math nuts

    You have 50' of head pressure.
    411 Plumb Appliance Stimulus Package

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    • #3
      Re: Here is one for you math nuts

      Originally posted by Gene Bickford View Post
      A 4" pipe is set at a 45 degree angle,
      is 100' long,
      is full of water,
      and has a clog at lower end.

      What would the PSI be at the point of the clog?

      According to my math the clog would be holding 453.071 pounds worth of head.
      What would that be converted to PSI?

      I tried to convert it, but I only have 10 fingers and 10 toes and I lost count at 19
      factor in the size of the clog displacing the water. water weighs 8.33 pounds per gallon. forget it. Math sucks
      Rod
      MT. Washington Sewer & Drain Cleaning
      Serving Berlin, NH and North Conway, NH areas
      http://unclognh.com
      http://mtwashingtonseweranddrainclea...m/default.aspx

      Charging less does not mean more call volume it just means you have to work harder to reach your goals.

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      • #4
        Re: Here is one for you math nuts

        wrong!

        J.C.
        Last edited by BobsPlumbing; 03-05-2010, 08:07 PM.

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        • #5
          Re: Here is one for you math nuts

          Originally posted by Redwood View Post
          You have 50' of head pressure.
          What do you mean? I'm confused already
          INSIGHT PIPE is now Maine Drain Serving most of ME with no charge for travel! 207-431-6232 is nolonger a working # our NEW # is 207-355-1476
          Sewer main snaking (roto rooting). Sink clogs. Sewer backup. Pipe inspection/locating. No Dig trenchless repair. Root clog removal.We are NOT to replace your local Plumber, as we do not do plumbing. WE ARE YOUR DRAIN CLEANING EXPERTS!!! www.sewermaine.com waterville winslow bangor augusta skowhegan fairfield pittsfield oakland

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          • #6
            Re: Here is one for you math nuts
            p = 0.434 h SG

            where
            p = pressure (psi)
            h = head (ft)
            sg = specific gravity





            sigpic

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            • #7
              Re: Here is one for you math nuts

              If we use the pythagorean theorema^2 + b^2 = c^2 and the pipe is at a 45 degree angle making a = b or 2X^2 = 10000
              x^2 = 5000
              height = 70.71 ft

              Now convert height into mm using the following conversions

              70.71 ft x 12 in/ft x 25.4 mm /inch = 21552.408 mm

              convert mm H20 to mm Hg using the specific gravity of mercury 13.6

              21552.408 x 1mm Hg/13.6 mm H2O = 1584.736 mm Hg

              1584.736 mm Hg x 1 atm/760mm Hg = 2.085 atm

              2.085 atm x 14.7 psi/1 atm = 30.650 psi roughly
              Distractions are everywhere, don't lose sight of your dream.

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              • #8
                Re: Here is one for you math nuts

                Originally posted by NHMaster3015 View Post
                p = 0.434 h SG

                where
                p = pressure (psi)
                h = head (ft)
                sg = specific gravity





                Assuming the water is 60 degrees Farenheit its specific gravity is 1

                p = .434 x 70.71 x 1
                p = 30.688 psi
                that formula seems much easier. Thanks
                Distractions are everywhere, don't lose sight of your dream.

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                • #9
                  Re: Here is one for you math nuts

                  Originally posted by JCsPlumbing View Post
                  21.64 psi

                  J.C.
                  I believe I'm incorrect on this calculation using 50'. Others double check please as I need to know.

                  After further thinking I believe it would be 30.61 psi.

                  Your hypotenuse is 100' at 45 degrees. Azz-u-ming it is a right triangle (probably not with a different degree, but who knows???) then your two legs would be an equal 70.71'.

                  That would give your rise leg a distance of 70.71' from the starting angle. 2.31 vertical feet equals 1 psi. 70.71/2.31= 30.61 psi.

                  EDIT: Devine beat me to it.

                  J.C.
                  Last edited by BobsPlumbing; 03-05-2010, 08:08 PM.

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                  • #10
                    Re: Here is one for you math nuts

                    If the pipe is 100' long ( stand it up, vertical ) then at 45% it would be 1/2 that or 50'
                    sigpic

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                    • #11
                      Re: Here is one for you math nuts

                      Originally posted by NHMaster3015 View Post
                      If the pipe is 100' long ( stand it up, vertical ) then at 45% it would be 1/2 that or 50'
                      100% positive?

                      Thanks.

                      J.C.

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                      • #12
                        Re: Here is one for you math nuts

                        need to know diameter of the pipe!

                        G3

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                        • #13
                          Re: Here is one for you math nuts

                          I'm sticking until taught otherwise.

                          Willing to learn though....

                          J.C.

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                          • #14
                            Re: Here is one for you math nuts

                            Originally posted by G3sprinklers View Post
                            need to know diameter of the pipe!

                            G3
                            4" sch 20. ID unknown
                            OD is same as sch 40. obviously ID of sch 20 is slightly larger but I'm just trying to get a rough idea so go with sch 40 ID of 4.026
                            Last edited by Gene Bickford; 03-05-2010, 08:32 PM.
                            INSIGHT PIPE is now Maine Drain Serving most of ME with no charge for travel! 207-431-6232 is nolonger a working # our NEW # is 207-355-1476
                            Sewer main snaking (roto rooting). Sink clogs. Sewer backup. Pipe inspection/locating. No Dig trenchless repair. Root clog removal.We are NOT to replace your local Plumber, as we do not do plumbing. WE ARE YOUR DRAIN CLEANING EXPERTS!!! www.sewermaine.com waterville winslow bangor augusta skowhegan fairfield pittsfield oakland

                            Comment


                            • #15
                              Re: Here is one for you math nuts

                              Originally posted by G3sprinklers View Post
                              need to know diameter of the pipe!

                              G3
                              Shouldn't matter, right?

                              J.C.

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