Piping Design Centrifugal Pump
Piping Design Centrifugal Pump
(OP)
Hi,
Why the suction and discharge lines have to be one or two sizes larger than the pump connection nozzles? What could happen if the suction or discharge lines are larger than the pump suction or pump discharge nozzles? I would appreciate if anyone can help me with an answer to this topic.
Regards,
One Point
Why the suction and discharge lines have to be one or two sizes larger than the pump connection nozzles? What could happen if the suction or discharge lines are larger than the pump suction or pump discharge nozzles? I would appreciate if anyone can help me with an answer to this topic.
Regards,
One Point





RE: Piping Design Centrifugal Pump
Desirable velocities in pump discharge are typically 6-8 ft/sec.
Don't believe there are any concerns if the piping velocities are lower than typical. Higher velocities will cause more problems than lower velocities.
RE: Piping Design Centrifugal Pump
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RE: Piping Design Centrifugal Pump
Larger suction pipe size is not mandatory if there is sufficient NPSHA.
Bigger suction pipe is necessary if the friction losses is too high and resulted in insufficient NPSHA at the pump inlet.
Similarly, discharge piping dia is depending on the flow rate hence velocity. High fluid velocity has high friction losses which mean more power is required to pump the same amount of liquid than with bigger pipe size.
Other factors to be considered are.
1) Total discharge pipe length.
2) Capital cost verses running cost.
RE: Piping Design Centrifugal Pump
The flat part of eccentric reducer is not always on top.
RE: Piping Design Centrifugal Pump
You could have added that if you were pumping fluids containing solids, you would also want the flat part on the bottom. However, this discussion is heading off topic.