Excessive water pressure

Discussion in 'Irrigation' started by srm077, Aug 20, 2008.

  1. srm077

    srm077 LawnSite Member
    Posts: 23

    This is my first post but I have been a long time lurker...

    I just purchased a new home with a contractor installed irrigation system using all Rain Bird parts. I noticed that my rotors are not spraying that great of a pattern and was looking for possible causes. I think it is related to excessive water pressure. My static pressure at a hose bib is 110 PSI and flow is about 20 gpm. My irrigation system lines are 1 inch poly with 1/2 inch connections to the heads. The heads are Rainbird 5000's with the blue 2.0 nozzle, valves are Rainbird 100 DV's. Backflow preventer is a Watts 007M1 QT installed between the meter and main valve. There is no pressure reducer on the system. Per my meter- my zones are using about 14 gallons per minute with 6 rotors running.

    I am thinking of installing a pressure reducer or trying the Rainbird 5004 + PRS heads with the built in pressure regulator.

    Any thoughts from the pro's? Also- it it common not to use clamps on the smaller poly lines that run to the heads?

    Thanks again in advance!

    -Scott
     
  2. DanaMac

    DanaMac LawnSite Fanatic
    Posts: 13,156

    Install a pressure regulator. Especially with the RB DV valves. They slam shut faster than most valves, which spikes the pressure for a brief moment at the valve. The valves will wear out faster, and you could get a broken manifold or valve.

    The smaller pipe feeding the heads is swing/funny pipe and no it does not need clamps. (if done properly)
     
  3. srm077

    srm077 LawnSite Member
    Posts: 23

    What pressure regulator should I purchase? Also- is there anyway to measure dynamic pressure at the last head in the zone?
     
  4. DanaMac

    DanaMac LawnSite Fanatic
    Posts: 13,156

    Brass PRV usually made by Watts or Wilkins. Don't know model #s.

    yes with a pitot tube and pressure gauge. Prepare to get wet when you do it.
     
  5. Waterit

    Waterit LawnSite Silver Member
    Posts: 2,888

    I can't believe it - straight-up advice to a HO with NO sarcasm? Dana, you're in too good a mood, what's up?:)
     
  6. DanaMac

    DanaMac LawnSite Fanatic
    Posts: 13,156

    Because he absolutely knew his s***. He knew what he was talkin' about.

    also it's lightly raining, good dinner, easy day
     
  7. srm077

    srm077 LawnSite Member
    Posts: 23

    How do you know I'm not in the Green business? I do not install irrigation systems for a living and was going to call out local company to fix my "Professionally" installed system. The company that installed it is a local landscaping company and thus far- I am unimpressed with the system they installed. I understand that the builder most likely did not give them adequate budget to complete the system.
     
  8. CAPT Stream Rotar

    CAPT Stream Rotar LawnSite Fanatic
    Posts: 5,889

    dude did his homework..
     
  9. DanaMac

    DanaMac LawnSite Fanatic
    Posts: 13,156

    Exactly. gotta give him props for it. :clapping: :clapping: :clapping:
     
  10. Waterit

    Waterit LawnSite Silver Member
    Posts: 2,888

    srm077, you are that most rare of homeowners: one who actually knows what he's talking about AND can ask a question that is answerable.
     

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