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need help on a safe gpm

Discussion in 'Irrigation' started by woodlawnservice, Jun 23, 2013.

  1. Kiril

    Kiril LawnSite Fanatic
    Messages: 18,334

    Totally agree. Irritates the hell out of me when I see irrigation systems running 1.25".
  2. whiffyspark

    whiffyspark LawnSite Fanatic
    Messages: 6,492

    Our local Jdl specs out 1 inch for enter system
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  3. Kiril

    Kiril LawnSite Fanatic
    Messages: 18,334

    The soils steady state infiltration rate is what will determine the maximum workable PR.

    Before you look to design a system to apply as much water as fast as possible, you need to determine the above.
  4. Kiril

    Kiril LawnSite Fanatic
    Messages: 18,334

    For most all postage stamp lots, that is usually (not always) sufficient.
  5. Wet_Boots

    Wet_Boots LawnSite Fanatic
    Messages: 50,517

    I see these 3/4-inch poly supply lines, and I imagine what they might do if subjected to the same sort of hammering that copper handled. :(
  6. 1idejim

    1idejim LawnSite Fanatic
    Messages: 11,314

    That's BS. One should know exactly what they are bidding, designing and installing without the input of a third party.

    My youngest daughter ran the commercial counter for a major parts store. Does she know parts? Yes. Can she rebuild a motor? No.
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  7. Kiril

    Kiril LawnSite Fanatic
    Messages: 18,334

    Agreed! How can one understand without understanding?
  8. Tom Tom

    Tom Tom LawnSite Bronze Member
    Messages: 1,281

    Why chance a guess? Do a flow/pressure test.

    Typically I see 12 gpm at 35psi/9ish gpm at 48 psi off 3/4 supply, 5/8 meter. I measure after zone valve to account for all losses accept lateral piping
  9. woodlawnservice

    woodlawnservice LawnSite Senior Member
    Messages: 949

    The meter is 3/4x5/8. That's what's stamped on the top. The manufacture says its a true 3/4" meter.. the supply is also 3/4 poly pipe.
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  10. 1idejim

    1idejim LawnSite Fanatic
    Messages: 11,314

    5/8 = 15 gpm @ 75 %

    3/4 = 22 gpm @ 75 %

    I would run the gpm/psi first but thats me.
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