Anomalies

Discussion in 'Irrigation' started by 1idejim, Oct 7, 2013.

  1. 1idejim

    1idejim LawnSite Fanatic
    Posts: 8,872

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  2. Sprinkus

    Sprinkus LawnSite Silver Member
    Posts: 2,048

    They're everywhere.........
     
    Last edited: Oct 7, 2013
  3. 1idejim

    1idejim LawnSite Fanatic
    Posts: 8,872

    I have been working on a site about 125 miles from home.

    1001–1083 Como St
    Weed, CA 96094

    It's a couple of baseball fields at the base of an active volcano, Mt. Shasta. The first day I found my target valves and 2 others in the larger park with the covered grandstands.

    Neither of the wire paths follow the mainline completely, the smaller park doesn't share the ditch until it gets near 3rd base. I have traced the wire paths and dowsed the mainlines and exposed both to verify location.

    Here's where things get complicated, when I trace the wire path using either a pro-800, a 521 or a TR 4110 I get great tone in both peak and null but the signal slope on either side extends for 10-15 feet. This covers or masks and eliminates the chance of locating intermediate valves.

    When tracking the valves in a closed loop I still receive a null over the wire path and an even broader signal slope which is chirping like I am over a valve for the length of the locate. This response should not be occurring and I cannot replicate the response elsewhere.

    I have talked to locating manufacturers, MIT grads, locators that I have the utmost of respect for and people that I figure may have encountered similar situations due to their regional location.

    I have resistors, chokes, extension wires, spare solenoids and even my leak detector loaded in the truck to attack this beast in the morning. I feel positive and have a good outlook about a successful outcome for the day. Since I hit my target the first day I still lived up to my obligations so getting a check is a done deal, now were working on my pride. I have always been able to say that I have always found my target and that means everything to me at this point.

    Whether I win or lose tomorrow I will report the outcome to the forum by Wednesday.

    I guess if I can shoot my mouth off about success' s I can tell you if I fail.

    I'd like to thank the people on the forum that spent some time with me discussing this project, Sprinkus, Danamac, Stillwater, big Dan and even Billy and a few others that had some input. I appreciate you guys :clapping:
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  4. 1idejim

    1idejim LawnSite Fanatic
    Posts: 8,872

    I didn't win didn't lose, can't call it a draw either.

    The P&R crew is laid off this week so the department head asked me to come back in the spring, finish this on and 5 other parks. 2 am wake up and 250 miles, just got in and I am beat. Will tell you all what happened tomorrow. Gotta feed the animals first.
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  5. Stillwater

    Stillwater LawnSite Platinum Member
    Posts: 4,800

    Did the resistors clean anything?
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  6. 1idejim

    1idejim LawnSite Fanatic
    Posts: 8,872

    Nothing really worked at all. I tried;

    Your idea of a choke
    My idea of resistors in 1/4, 1/2 and 1 watt
    Tracing the common from the end of the run back to the clock
    Cutting and isolating the wire path in the field
    Grounding the non target wires
    Using circuit interruption and an acoustic listening device
    Peak locating mode while traveling parallel to the wire path
    Null locating at the crux of the signal slope
    Dividing the field and exposing the wires to physically verify wire count
    (There is a possibility that some wires were extended beyond the valve)
    I used locate signals 1.75k, 2k, 84.4k, peak and null response modes
    Near and far grounds, open and closed

    The department head realizes that this ain't no walk in the park and we developed a plan, as I said last night. One of the guys documented all of the measurements and I have a basic drawing of the field for reference

    The valves that I have found are placed in areas that make perfect sense, on either or both sides of the mainline (which splits the field) inline or near to the laterals. Using this line of reason, once past the lateral there should be one less wire. Wrong, and amperage measurements tell me the valve hasn't been passed.

    There's gotta be a reason for the anomaly and I gotta figure it out. Fortunately everything that was broken I have found and the rest of the system is in good shape for the time being. We'll give'r another go in the spring :)

    Thanks again guys :waving:
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  7. Sprinkus

    Sprinkus LawnSite Silver Member
    Posts: 2,048

    Stick a small sonde in the mainline and then turn on the target valve. The sonde should travel to and get stuck in the valve.
    And yes, I have actually never done this before. :waving:
     
  8. 1idejim

    1idejim LawnSite Fanatic
    Posts: 8,872

    Got a call to check the brakes and change the oil, were headed back up the hill. Seems there's a shorted solenoid on one of the fields and the grass is turning brown.
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  9. irritation

    irritation LawnSite Gold Member
    Posts: 3,149

    Thanks for the update. Dog piss causes brown grass also. Hope it's not a wasted trip.
     
  10. RhettMan

    RhettMan LawnSite Silver Member
    from Texas
    Posts: 2,057

    Mr. Jim, please forgive my ignorance and curiosity.

    What your saying is: there is a valve that your going to find that you have not yet found?

    Also, what is an intermediate valve?
     

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