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Figuring Pressure Loss

Discussion in 'Irrigation' started by Dirt Boy, Jan 14, 2008.

  1. Dirt Boy

    Dirt Boy LawnSite Senior Member
    Posts: 487

    A little brain exercise:

    When you figure pressure loss for poly pipe, it is typically rated as loss per hundred feet. So, I would assume that if you have a piece 1 foot long, the psi loss would be 1/100th. Is that correcto?? Example: 1" poly has a loss of 2.73 psi/100', so 1' would have a loss of .0273 psi.

    Along the same line, velocity FPS for any GPM would NOT change, no matter the length. Is this a correct statement? Example: 1" poly @ 10 GPM is (according to my chart) going to have a Velocity of 3.70 FPS. So, no matter if it's 1' long or 100' long, velocity is going to stay the same. Correcto??

  2. Wet_Boots

    Wet_Boots LawnSite Fanatic
    Posts: 47,683

    This is brain exercise? In mathematical terms, you are asking if these relationships are linear. They are. (Correcto)

    Now ask us about stagnant pressure.
  3. Dirt Boy

    Dirt Boy LawnSite Senior Member
    Posts: 487

    All right, so I have a small brain!!:cry:

    Thanks just the same.

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