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  1. VAMechE

    Static Suction Lift vs NPSHr vs NPSHa

    TenPenny, I don't think that the pipe will be empty very often, but I am trying to figure out all my worst case scenarios. Realistically it will be empty upon installation and and if for some reason during maintenance it is necessary to open the pipe up upstream of the first gate valve (or...
  2. VAMechE

    Static Suction Lift vs NPSHr vs NPSHa

    I was just trying to wrap my head around the concepts of static suction lift and NPSH but I can't reconcile why you would only be able to pull a suction lift of 20' when the NPSHr is 4 ft????? I would think that if the NPSH was 4' you could pull a prime up to 29' (33'-4'). Does the NPSH only...
  3. VAMechE

    Static Suction Lift vs NPSHr vs NPSHa

    TenPenny, Thanks for the reply! I spoke with the Emerick Associates in Cohoes and they gave me some more info on the pumps as well. The info they gave me provided a priming time curve that I didn't have previously, I'm a little concerned about that as well, since there could possibly be about...
  4. VAMechE

    Static Suction Lift vs NPSHr vs NPSHa

    I would like some clarification/advise/sanity check on a project I am reviewing at work. I was handed a project (already in construction) for a municipal water pumping system for one of our hospitals. I will describe the system first (starting at intake end) then ask my question. The intake...
  5. VAMechE

    residential submersible pump

    I take it those are the drives on the wall? These new C series pumps have the drives built into the motor. Not sure if that is a bad thing after reading your posts! I'm now considering redesigning the system to use a pressure regulator, but I would have to get some documentation from the BOH...
  6. VAMechE

    residential submersible pump

    Valvecrazy, The pumps in question are a CRIE 15-2. The reason I went with them is that my boss seems to think the 10 states says you can't use a back pressure regulator (because of a restriction on having cross connections). When I read the reg I didn't interpret it that way, but he is the...
  7. VAMechE

    residential submersible pump

    Valvecrazy, Are you saying that all VFD drives have a lifetime of 5 to 8 years? I just designed a water treatment system at work using 2 Grundfos 5 hp pumps. These have integrated VFD drives and I would hope we get more than 5 years out of each one.
  8. VAMechE

    Auto Power steering pump construction question

    I was wondering if anyone here has experience with auto power steering pump construction? Specifically I was wondering what type of pumps are usually used? I always thought they were rotary vane pumps, but now I've seen things that would leave me to believe they are gear-rotor pumps...

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