Pump running at end of curve
Pump running at end of curve
(OP)
For a vertical submersible pump ( closed drain drum pumps of Vs4 type) , the vendor has given the allowable operating region upto the end of its curve . Is it advisable to run a centrifugal pump continuously at its end of curve? Will there not be any impact on its effective life of the components. However the selected drive motor power is suitable for this operation. Thanks to clarify.





RE: Pump running at end of curve
NO.
Will there not be any impact on its effective life of the components.
Most certainly there will be.
However the selected drive motor power is suitable for this operation.
If end-of-curve operation is not required, the motor might actually be oversized, so check that,
it is not oversized,
properly sized for BEP and
that the BEP point was actually specified and/or selected using the correct average and anticipated ranges of operation.
**********************
"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: Pump running at end of curve
But actually operating there for any extended period of time will result in a shortened life, shafts and bearings are usually the first to go.
Also, your use of the term 'VS4' sounds like an API service - note that 610 limits acceptable operating range to, what is it 105% of BEP or something like that?
RE: Pump running at end of curve
Johnny Pellin
RE: Pump running at end of curve
**********************
"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: Pump running at end of curve
RE: Pump running at end of curve
RE: Pump running at end of curve
**********************
"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: Pump running at end of curve
RE: Pump running at end of curve
So yes, if your operating procedures can handle it, shutting in the discharge valve for Case 1 operation should get the pump off the end of its curve. Otherwise add a control valve.
Regards,
John
RE: Pump running at end of curve
**********************
"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: Pump running at end of curve
RE: Pump running at end of curve
**********************
"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: Pump running at end of curve