Discussion in 'Irrigation' started by shadetreelawns, Nov 18, 2012.

  1. 1idejim

    1idejim LawnSite Fanatic
    Messages: 11,358

    Did the pump always cycle? when it does cycle, what is a lot? I didn't say short cycle or fast cycle which are different issues.
    You say with the pump off the pressure decreases. This would be due to a gradual loss of pressure as the pressure drops from cut-out to cut-in pressure. You ganged a set of valves to keep the pump running, you might of masked the problem, maybe not.

    Clock the amount of time between cut-out and cut-in and the size of the drawdown of the pressure tank.

    Calculate the demand requirements of the zone and if they don't jibe you may have a cracked pipe that opens and closes.
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  2. jvanvliet

    jvanvliet LawnSite Gold Member
    Messages: 3,944

    Which might account for the "sand and clumps of dirt" in the line.

    IMO; demands systems are a PIA;

    I'm thinking the pump shouldn't cycle at all with a valve open.
  3. Mike Leary

    Mike Leary LawnSite Fanatic
    Messages: 23,171

    Re-think both comments, they are both wrong, IMHO. :dizzy:
  4. jvanvliet

    jvanvliet LawnSite Gold Member
    Messages: 3,944

    Not for S. Florida irrigation.

    Leaky fittings & valves are common as a result of our alkaloid soil; they cause a pump motor to cycle night and day burning them out in short order. I've replaced lots of burned out motors and installed lots of timers between the power and the pump to prevent them from continually cycling.

    Why would a pump cycle when it has continual demand? If it continually cycles while irrigating, I'd say you have a problem.

    Your opinion is probably valid where you live and have worked.

    IMHO, demand systems are a PIA for irrigation and the pump should not be cycling on and off continually with a valve open. :drinkup:

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