minimum flow bypass
minimum flow bypass
(OP)
A boiler feedwater motor for the deareator in a unit that the RTD's increase in temperature when the pump's minimum flow bypass is opened. These are VFD motors, but are operated at full speed when the minimum bypass is opened on low discharge pressure. Why would temperature increase?





RE: minimum flow bypass
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"Pumping accounts for 20% of the world's energy used by electric motors and 25-50% of the total electrical energy usage in certain industrial facilities."-DOE statistic (Note: Make that 99% for pipeline companies) http://virtualpipeline.spaces.live.com/
RE: minimum flow bypass
**********************
"Pumping accounts for 20% of the world's energy used by electric motors and 25-50% of the total electrical energy usage in certain industrial facilities."-DOE statistic (Note: Make that 99% for pipeline companies) http://virtualpipeline.spaces.live.com/
RE: minimum flow bypass
I am confused by the last part of your post. You say that the bypass opens when the discharge pressure is low. Normally, I would expect the bypass to open when the discharge pressure is high; indicating a low net flow from the pump. If the discharge pressure is low, this would suggest higher flow from a centrifugal pump and no need for minimum flow bypass. We need more details to understand what you are describing.
Johnny Pellin
RE: minimum flow bypass
**********************
"Pumping accounts for 20% of the world's energy used by electric motors and 25-50% of the total electrical energy usage in certain industrial facilities."-DOE statistic (Note: Make that 99% for pipeline companies) http://virtualpipeline.spaces.live.com/
RE: minimum flow bypass
Did you know that 76.4% of all statistics are made up...