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  • Users: 77JQX
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  1. 77JQX

    Fire hydrant testing and water hammer - training resources and video

    Hi everyone. I work for a municipal water company. After yet another main break associated with water hammer from fire hydrant testing, I have been asked to provide some training to the fire department on the theory and effects of water hammer. I'm hoping some of you can point me toward some...
  2. 77JQX

    Hydraulic Equivalent to GFCI?

    We are a water utility with an established backflow and cross connection control program. For commercial customers, we require an RP on domestic and irrigation lines, and DCDAs on fire services. We have someone who wants to use domestic water as a heat source/sink for commercial building HVAC...
  3. 77JQX

    Quick Connect toolbox to bicycle rack

    Hi everybody. I thought maybe the good people here could help me out. I'd like to mount a toolbox (or army surplus ammo can) to my bicycle rack, and I'd like it to be a quick connect type of mount for easy removal. I'd also like it to be semi-secure, so that someone can't easily remove it if...
  4. 77JQX

    Valved Out Water Distribution Tank for Winter - Full or Empty?

    Hi all, I want to get your opinions on our idle water tank. We have a 2.5 MG (150 foot dia by 20 feet tall) welded steel ground level water tank that we take out of service every winter. In our climate, ice would definitely form on the surface, but it wouldn't freeze solid. Last winter we left...
  5. 77JQX

    Loading versus slip

    Hi - I hope you all can help me out. I'm a civil, trying to understand a centrifugal pump's operation - it isn't operating on the published curve. I'm wondering if I have an accurate curve, or if I have a motor problem. Mechanically, the pump is in good condition - we've inspected and...
  6. 77JQX

    Exercising Redundant/Emergency Pumps

    I work for a water utility that has many redundant/emergency pumps installed. Most of these are split case pumps in the 100 to 200 HP range, although we also have several idle lineshaft deep well pumps. Is there literature that addresses how often these pumps should be operated to ensure they...
  7. 77JQX

    ACP or Transite Pressure Rating for potable water

    Hi all I have a set of potable water system design drawings from 1979 that call for installation of '10" T-90 A.C.P. Transmission Main.' This pipe is currently subjected to working pressure in the 375 to 400 psi range. Can anyone steer me to documentation relating to pressure rating of this...

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