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  #61  
Old 10-23-2010, 09:03 AM
Kiril Kiril is offline
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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.
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  #62  
Old 10-23-2010, 09:24 AM
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FIMCO-MEISTER FIMCO-MEISTER is offline
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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.
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  #63  
Old 10-23-2010, 10:17 AM
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Wet_Boots Wet_Boots is offline
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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.
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  #64  
Old 10-23-2010, 10:38 AM
Kiril Kiril is offline
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Don't know, but I would think it would take both pressure and flow sensors, and probably some other cool tech.
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  #65  
Old 10-23-2010, 10:49 AM
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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.
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  #66  
Old 10-23-2010, 12:12 PM
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FIMCO-MEISTER FIMCO-MEISTER is offline
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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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  #67  
Old 10-23-2010, 12:16 PM
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Mike Leary Mike Leary is online now
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Quote:
Originally Posted by FIMCO-MEISTER View Post
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.
What's the max 'bump" you've ever recorded?
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  #68  
Old 10-23-2010, 12:18 PM
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1idejim 1idejim is online now
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Quote:
Originally Posted by Wet_Boots View Post
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.
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.
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  #69  
Old 10-23-2010, 12:24 PM
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Quote:
Originally Posted by FIMCO-MEISTER View Post
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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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.
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  #70  
Old 10-23-2010, 12:54 PM
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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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