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Pressure loss in one zone...

Discussion in 'Irrigation' started by cahermit, May 15, 2007.

  1. cahermit

    cahermit LawnSite Member
    Messages: 66

    I have a client with their front yard split into 2 zones.
    One zone is functioning just fine. The other zone has a lack of pressure, causing the spray heads to not rise completely, which I had figured out to be a bust on the outer edge due to roots. So I fixed the break, but it didn't fix the problem. There are no soggy or especially green patches, so I'm not too sure that it's another break.
    Am I wrong in assuming that the problem is either another break in the line, or a clogged valve? This zone has less heads than the functioning zone, but I was also concerned because whoever installed the system used a bunch of funky nozzles, putting 180's where there should be 90s, etc... If I changed these nozzles out to the appropriate spray patterns, could this make that much of a pressure change? I wouldn't think so, but that might also be the plm...
  2. Mike Leary

    Mike Leary LawnSite Fanatic
    Messages: 23,100

    Is this system something you just took on, or have you seen it work before?
  3. Mike Leary

    Mike Leary LawnSite Fanatic
    Messages: 23,100

    I think you got my drift..it mite never have worked..before you tear into the
    valve & after you've checked for a iso valve (doubtfull on a small system),
    turn the flow controls down one by one to increase the psi...check the wiper
    seals for flow-by. We finally had custom blank nozzles made to check system
    operation, all should have a few in service truck.
  4. PurpHaze

    PurpHaze LawnSite Fanatic
    Messages: 5,496

    Without seeing the system here's just another guess: Put the correct nozzles in and then check and see (listen) if the valve diaphragm is opening fully.
  5. cahermit

    cahermit LawnSite Member
    Messages: 66

    ya I've seen it work before.
    I wasn't sure if they had those blank nozzles to check system pressure, but I had thought of that and intended on inventing them if they didn't exist... :)
    I will certainly need to switch out the nozzles. I don't understand how idiots can do such stupid things. But then again, another idiot amazes me every day.
    Thanks for the replies and when I get it fixed I'll post here with what it was...
  6. gusbuster

    gusbuster LawnSite Bronze Member
    Messages: 1,926

    Really simple and not probably thought of, on the problem zone, close off the flow adjuster on all the spray head. If you have a broken nipple,pipe somewhere in the system, it should make it manifest itself.

    What brand is the body of sprays? Toro, watermaster\orbit,rain bird...
  7. cahermit

    cahermit LawnSite Member
    Messages: 66

    I think they're all crappy toros...
  8. cahermit

    cahermit LawnSite Member
    Messages: 66

    So, I fixed the problem, I simply turned on the valve for the zone, turned off all of the spray heads (using the screw :) ), and walked the lawn until I noticed the flow of a leak. Fixed it, tested it. All is well.

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