Conversation with Griswold Controls

Discussion in 'Irrigation' started by FIMCO-MEISTER, Oct 20, 2010.

  1. Kiril

    Kiril LawnSite Fanatic
    Posts: 18,298

    Big difference between prevention and mitigation .... and IMO systems should be designed to handle both. Funny thing is .... a manifold, especially one close to the POC, conforms to your "multi-fittings and short pipe" approach .... so I guess that means you are signing off on manifolds now. :clapping:
     
  2. depends on where the POC is relative to the system and if I can work some elbows on the outlet side. Sure is a lot easier doing single valves but yeah I guess one could figure out how to avoid water hammers in a manifold system. if i did do manifolds I could guarandamntee ya i rely on a Griswold MV and a zone delay controller. last thing i want is a water hammer creating a friggin manifold repair.
     
  3. Wet_Boots

    Wet_Boots LawnSite Fanatic
    Posts: 47,020

    So, if you were going to pursue some measurement of this water hammer phenomenon, what intrumentation would you use? Solid-state pressure sensors, is what I'd guess.
     
  4. Kiril

    Kiril LawnSite Fanatic
    Posts: 18,298

    Don't know, but I would think it would take both pressure and flow sensors, and probably some other cool tech.
     
  5. Wet_Boots

    Wet_Boots LawnSite Fanatic
    Posts: 47,020

    I remember there being some fairly inexpensive pressure sensors available. Something akin to strain-gauge electronics, I believe. Flow would be tougher to get an instantaneous read on, I would think. I picture something like a pitot tube in a line, connected to another gauge.
     
  6. I have a gauge that measures the max closing pressure. When it swings it leaves one indicator at the bump pressure then goes to the static pressure. Faster than the eye can see for sure.
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  7. Mike Leary

    Mike Leary LawnSite Fanatic
    Posts: 21,811

    What's the max 'bump" you've ever recorded?
     
  8. 1idejim

    1idejim LawnSite Fanatic
    Posts: 9,141

    my brother in law has leased some bottom ground to a specialty nut orchard company and last week a company was here to do water testing, they sounded the depth and tested the supply.

    my bnl explained that the tech used a Doppler flow meter and a vibration tachometer to determine the flow at motor rpm.

    i should get to see the report, i'll share any pertinent information when i do.
     
  9. 1idejim

    1idejim LawnSite Fanatic
    Posts: 9,141

    i prolly have the same gauge pete, mine's dry and i don't think you can get a real accurate reading from a dry vs filled gauge. just my opine.
     
  10. Wet_Boots

    Wet_Boots LawnSite Fanatic
    Posts: 47,020

    Dial gauges of any sort wouldn't do to measure instantaneous forces. I know I can look at a dial swing at a valve closing, and make a good guess as to whether I need to worry or not, but I'd want more detail than that.
     

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