Using a centrifugal pump to irrigate from pond

Discussion in 'Irrigation' started by BrendonTW, Aug 22, 2011.

  1. Wet_Boots

    Wet_Boots LawnSite Fanatic
    Posts: 46,879

    Using the 2 HP DHG centrifugal at 50 gpm doesn't even get you much beyond 40 psi total head, and that goes lower once you deduct for suction losses, which leaves you little in the way of allowable losses through pipe and valves, to have even 30 psi at the heads.
     
  2. Kiril

    Kiril LawnSite Fanatic
    Posts: 18,298

    It gives you 49.795 PSI total at your max recommended operating range (~ 115 feet head) which is close to 40 GPM. Without knowing details on pipe size, pipe run, elevation changes, suction lift, etc ..... (i.e. knowing your total head requirements) you cannot dismiss this pump as being a feasible option.
     
  3. Wet_Boots

    Wet_Boots LawnSite Fanatic
    Posts: 46,879

    the OP is talking 50 gpm minimum. Not 40, and even at 40 gpm, the output pressure of the DHG isn't anything that will let you run "big heads" like he was considering.

    I think 50 psi head pressure is a bare minimum for heads beyond standard residential equipment, and 60 psi would be a more realistic minimum.
     
  4. Kiril

    Kiril LawnSite Fanatic
    Posts: 18,298

    I didn't see the information required to calculate total head. Perhaps you can point it out to me?
     
  5. Wet_Boots

    Wet_Boots LawnSite Fanatic
    Posts: 46,879

    Huh? OP wants big flow and big pressure for a system beyond the usual PGPs or 5004s. I simply note that a centrifugal pump doesn't get you there.

    (and most centrifugals don't get you into the comfort zone of standard system designs)
     
    Last edited: Aug 23, 2011
  6. Kiril

    Kiril LawnSite Fanatic
    Posts: 18,298

    Yea .... OK Boots.
     
  7. Wet_Boots

    Wet_Boots LawnSite Fanatic
    Posts: 46,879

    So why don't you wind up that propeller beanie you wear as a thinking cap and show us all how a centrifugal pump is going to cover some acreage with 'big' sprinklers on it.
     
  8. Popcorn here! Sodas here!

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  9. Wet_Boots

    Wet_Boots LawnSite Fanatic
    Posts: 46,879

    At ease, soldier. Even Poindexter J. Sliderule is going to take some time to find popup sprinkler heads that can throw 50 feet with less than 40 psi feeding them.
     
  10. Kiril

    Kiril LawnSite Fanatic
    Posts: 18,298

    Still waiting for that data you need to determine an appropriate pump. Do you have that info boots?

    Beyond that we are talking about 2.5 acres here .... not 250. How "big" of a sprinkler do you need? How much money does the guy have to throw down for sprinklers? The Hunter G870 series rotor, a "big" turf rotor is listed at $255 per head, the G70 series at ~$120.

    But then, what about Rainbird? The Falcon 6504 Series has a listed radius of 51 feet with a #10 nozzle consuming 8.1 GPM at a nozzle pressure of 40 PSI .... and for a fraction of the cost. Using the DHJ you can easily do it with these rotors. You could probably pull it off even with the the DHG, DHHG or DHH .... but without the data necessary to choose an appropriate pump we just don't know .... do we boots?
     

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