Water Hammer

Discussion in 'Irrigation' started by Rotor-Man, Apr 2, 2003.

  1. Rotor-Man

    Rotor-Man LawnSite Member
    Messages: 126

    My last install of 2002 has resulted in water hammer in the system. The only way out of the house for the plumber was by the way of about 6 -90degree elbows and 2 -45 degree elbows[all 1" copper] going to the p.v.b. Any suggestions on a remedy, my plumber suggested a water hammer arrestor be installed in the copper line. The system is a 5/8 meter with all 7 zones pushing about 11 g.pm.
  2. Ground Master

    Ground Master LawnSite Senior Member
    Messages: 505

    static pressure?
  3. HBFOXJr

    HBFOXJr LawnSite Bronze Member
    Messages: 1,712

    What size incoming line? 11Gpm is a little hot for 3/4 copper. If you have one inch in with 5/8 meter your OK.

    Plumber is right. We have made them from 1.25" or 1.5" pvc and 12-18 inches tall with a glue cap on the one end.

    Get back to us on this so others can learn from this thread.
  4. Planter

    Planter LawnSite Member
    from Utah
    Messages: 214

    Harold, just what does this look like and where do you put it in the line? I assume that it is mounted vertical with air trapped in it so the air compresses to arrest the hammer?
  5. HBFOXJr

    HBFOXJr LawnSite Bronze Member
    Messages: 1,712

    Yes mount vertically to trap the air.

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