Motor size
Motor size
(OP)
How can I determine the approximate motor size for a sewage pump that has an operating point of 6600 gpm @ 6 ft. The pump speed is 330 rpm. The pump manufacture's bhp curve shows a maximum value of 170 at startup, and, 130 at the operating point. The pump efficiency at the duty point is 86%.





RE: Motor size
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.)
RE: Motor size
RE: Motor size
RE: Motor size
Unless you don't plan to start the pump.
RE: Motor size
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It calculates to 11.6 BHP
RE: Motor size
RE: Motor size
The power you suggested is out by a factor of 10.
The starting power is not (170hp) 17hp - this is the power if operating at maximum head and zero flow not a starting condition.
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.)
RE: Motor size