Pressure measurement question

Discussion in 'Irrigation' started by 1idejim, Dec 3, 2013.

  1. 1idejim

    1idejim LawnSite Fanatic
    Posts: 9,076

    My question is directed toward Boots but any input is welcome.

    I'm wondering if installing a pressure gauge downstream of a centrifugal pump on a pool return might lend a clue as to the pumps perfoance. I've always used a vacuum gauge at the pump volutes for evaluations but it dawned on me that we use a pressure gauge on the filter to determine when the filter needs service, why not the pump.

    I realize that the pool is a closed system, (meaning the intake and return are from the same resivoure) bit having no bulkheads (lack of a better word) one can only measure dynamic pressure.

    Once a pump is in operation and the pressure recorded, the pressure could be compared anytime the pump was running.
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  2. grassman177

    grassman177 LawnSite Fanatic
    Posts: 9,795

    I guess no one knows
     
  3. Wet_Boots

    Wet_Boots LawnSite Fanatic
    Posts: 46,907

    I never did place many gauges on field plumbing, because outdoor gauges always died over the winter. They can't fail to be useful as a tell-tale, or a diagnostic aid.
     
  4. Kiril

    Kiril LawnSite Fanatic
    Posts: 18,298

    What happens to your measurement when demand changes?
     
  5. 1idejim

    1idejim LawnSite Fanatic
    Posts: 9,076

    That's a good point Chief. In the pool industry demand would decrease due to constriction or obstruction or increase due to breakage or additional pumps drawing off the return
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  6. stebs

    stebs LawnSite Senior Member
    Posts: 366

    Jim, unless im misunderstanding you, the gauge on the filter would give you a pressure post pump and yet pre-filter.... To check pump performance, go by clean filter readings, although there are a lot of variables... water level in pool, clean skimmers, clean main drains, all valves in same spot...
     
  7. 1idejim

    1idejim LawnSite Fanatic
    Posts: 9,076

    We've always used the filter pressure as reference point for cleaning the filter. 8-12 psi is optimal clean filter pressure range. 18-20 psi and we clean the filter.

    The pressure at the return should be somewhat higher due to the reduction in size of the orfice at the wall
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  8. Kiril

    Kiril LawnSite Fanatic
    Posts: 18,298

    So a change in pressure may or may not indicate a decrease in pump performance, but it may also indicate other potential problems in the system.
     
  9. 1idejim

    1idejim LawnSite Fanatic
    Posts: 9,076

    That's what I'm struggling with. L
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  10. 1idejim

    1idejim LawnSite Fanatic
    Posts: 9,076

    That's what I'm struggling with. Looks like some in field experiments are in order.
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