I am working on making improvements to an existing water system and have a few questions.  Background: 66 homes spread over 6 miles; distribution pipes are 4", 2", and 1.5"; Currently the well's 10 hp submersible pump runs continuously at about 90 gpm, causing the reservoir (located 2 miles away) to continuously overflow.My preferred pump control option is to use a radio SCADA system to turn the pump on and off based on the reservoir water level.  Since I will be turning the pump on and off, I am concerned about pressure surges, but don't want to make this system more complicated than it needs to be.  > Is a pump control valve needed?  It seems like they require a lot of additional valves (surge anticipator valve, check valves, and isolation valves) plus a way to discharge water> Is a check valve sufficient? (there is aleady a check valve installed)> Would a pressure reducing valve work?> Would a cycle stop valve work?I am also not sure about needing to install a soft start for the pump since it would now be turning on and off.  Are there any advantages to intalling a soft start?  Are they just an added expense that isn't really necesary?  Would having a softstart reduce the potential for pressure surges?Sorry for the long list of questions. I would appreciate any insight you can give.
Further information is needed before one can make a reply.Is there an elevation difference?When you say reservoir, are you talking about a water supply tank? And are you pumping directly from the well to the tank? Or are you pumping into the water distribution system?

Operate over BEP to more than 120% you have:1. More power consumption.2. More NPSHr with cavitation failure risk.3. Erosion in high velocity zones, Cut water, suction, discharge vanes zone, etc.3. More radial load with bearing and shaft failure risk.4. Global vibration levels increase dramatically.5. Reliability going down to 30%.6. Other unstable hydraulics issues.Slurry pumps

2011-08-24

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