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  1. Yellowtetra

    Pump Control Valve vs. VFD

    First, you really need to perfrom the required transient anaylsis or get someone qualified to do it. Second, VFDs will generally work fine. They don't have to be fast, they are cheaper than flow control valves, easier to install, and easier to maintain. You also get the advantage of running...
  2. Yellowtetra

    Low Pressure Sewer Model

    Learn WaterCad. Much more powerful and better presentation graphics. You won't be sorry. I will second the poster who mentioned that most if not all of the modeling programs will not do a good job of catching negative pressures. The reason why is the program does not use pressure for...
  3. Yellowtetra

    FM discharge is lower than high point of FM

    Doug, I agree with the other posters on plotting your hydraulic profile to determine if a siphon is even possible. If it is, you can almost never count on a dependable siphon since any air or gases that get into the high spot will destroy the siphon. Your system would perfrom erratically...
  4. Yellowtetra

    New Pump Along Existing Force Main

    ChrisTN, This can be modeled with EPAnet or any kind of pressure hydraulic modeling software like SewerCad, WaterCad, KYpipe, etc. Dan Barr, PE Burgess and Niple
  5. Yellowtetra

    rural distribution system pressure problem

    Doug, Where are you measuring the low pressure? A hydrant connection or somewhere else? Make sure the place you are installing the gauge is not clogged. How close to the new standpipe location is the nearest pressure reading that makes sense? Finally, if everything was working right, what...
  6. Yellowtetra

    Water storage tank sizing

    There are many factors that go into sizing storage tanks. I recently wrote an article for the Ohio AWWA going into some detail about it. Here's a link to it. http://www.ohiowater.org/OAWWA/Newsletter/Summer%202007/2007%20Summer%201-10.pdf I hope this helps! Dan Barr, PE Burgess and Niple

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