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  1. Newgeer

    Flow Control - Pressure Regulation

    The flow curve shows 0 flow at 0 head. So the head must be gage. It would appear that if the valve is mid-stroke at 1.1 gpm, then flow control shouldn't be a problem. Thank you JimCasey, and all who responded. Newgeer
  2. Newgeer

    Flow Control - Pressure Regulation

    The pump literature lists 5 impellers, the smallest of which generates 28 feet of head. The control valve is a Fisher easy-E with a 1/4" port. The Cv is 0.075, 0.175, 0.641, 1.52 at 10%, 30%, 70% and 100%, respectively. Assuming negligible pressure loss due to piping, will those Cv figures...
  3. Newgeer

    Flow Control - Pressure Regulation

    Well...I am trying to control the flow using a control valve. A positive-displacement pump with a VFD would offer good flow control. However I don't think a VFD will give the same result with a centrifugal pump as the pump is designed to produce a constant head. It appears I tackled the...
  4. Newgeer

    Condensate Return Required?

    Is the 'seal leg' typical of installations? I would have thought the steam would condense wherever the load is. Also, I can mount the heat exchanger up to 18 feet above the boiler. Is higher better?
  5. Newgeer

    Condensate Return Required?

    Hi All, I am working on a farm-scale ethanol plant project. One of the systems requires ethanol to be vaporized. The design calls for a 24kW boiler to feed saturated steam to a heat exchanger (vaporizer) at 50psig. The heat exchanger load is approximately 25,000BTU. There are no other...
  6. Newgeer

    Flow Control - Pressure Regulation

    You folks were right about the pump. I had the flow curve right in front of me, and I read 60ft head as 60psi. So that's about 41psia?
  7. Newgeer

    Flow Control - Pressure Regulation

    I apologize for not being more specific. The plumbing consists of one elbow and about four feet of 1/2" pipe, with zero elevation change. The column runs at atmospheric pressure. So the pressure downstream of the control valve is 15psia or very close to it. The flow through the valve is only...
  8. Newgeer

    Flow Control - Pressure Regulation

    Hi All, I am working on a farm-scale ethanol plant project and have a question regarding flow control. Our reflux apparatus consists of a centrifugal pump and a flow control valve. The pump generates 60psia upstream of the valve. The downstream pressure is 15psia. Not wanting a 45psi...

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