Pump Size Clarification
Pump Size Clarification
(OP)
Hi,
I have a 500 ft 8" sch 40 black steel pipe connecting to a 400 ft 6" sch 40 black steel pipe and the discharge at the end is 1130 gpm at 160 psi. It is a straight run pipe, no elevations. My client ordered a pump of 3000 gpm at 200 psi to discharge to the pipe run (8" and 6" pipe). can you show/help me clarify the pump is acceptable?
Thank you.
I have a 500 ft 8" sch 40 black steel pipe connecting to a 400 ft 6" sch 40 black steel pipe and the discharge at the end is 1130 gpm at 160 psi. It is a straight run pipe, no elevations. My client ordered a pump of 3000 gpm at 200 psi to discharge to the pipe run (8" and 6" pipe). can you show/help me clarify the pump is acceptable?
Thank you.





RE: Pump Size Clarification
RE: Pump Size Clarification
Basically pressure drop is proportional to flow squared if you've got no elevation difference.
So your 3000 gpm pump is operating at barely one third rated flow so will probably be quite inefficient and might be below min flow.
Pump is too big.
Your client is an idiot.
Remember - More details = better answers
Also: If you get a response it's polite to respond to it.
RE: Pump Size Clarification
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"Is it the only lesson of history that mankind is unteachable?"
--Winston S. Churchill
RE: Pump Size Clarification
RE: Pump Size Clarification
Where is the new pump connecting? Start end or middle of this pipe?
Is the flow in addition to what is they now or replacing it?
Judging from the velocities you're already at max flow rate for the pipe size.
Remember - More details = better answers
Also: If you get a response it's polite to respond to it.
RE: Pump Size Clarification
It is a capital mistake to theorise before one has data. Insensibly one begins to twist facts to suit theories, instead of theories to suit facts. (Sherlock Holmes - A Scandal in Bohemia.)