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what is purpose to provide backvanes on empiler at backside in centrifugal pump?

what is purpose to provide backvanes on empiler at backside in centrifugal pump?

what is purpose to provide backvanes on empiler at backside in centrifugal pump?

(OP)
what is purpose to provide backvanes on empiler at backside in centrifugal pump?

RE: what is purpose to provide backvanes on empiler at backside in centrifugal pump?

To evacuate pumped material from behind the impeller.

Ted

RE: what is purpose to provide backvanes on empiler at backside in centrifugal pump?

It also keeps the pump shaft seal at suction pressure rather than at discharge pressure, and provides better cooling for the seal.

RE: what is purpose to provide backvanes on empiler at backside in centrifugal pump?

Probably the most important reason is that is balances the pressures on both sides of the impeller so there are not high thrust loads on the pump bearings

RE: what is purpose to provide backvanes on empiler at backside in centrifugal pump?

This design is normally only seen in slurry pumps. It is to remove material from the area arround the seal. It should never provide a vacuumn as you could draw air into the pump. Sometimes they are designed to maintain high ciculation arround the shaft and seal.

RE: what is purpose to provide backvanes on empiler at backside in centrifugal pump?

Also found in paper stock pumps as well as many process pumps, can also be found on the front shroud of slurry pumps, so they become "front" pump-out vanes.

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: what is purpose to provide backvanes on empiler at backside in centrifugal pump?

Just curious....does anyone have a picture of these?

=====================================
(2B)+(2B)' ?

RE: what is purpose to provide backvanes on empiler at backside in centrifugal pump?

Picture of what, Impeller with pump-out vanes?

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: what is purpose to provide backvanes on empiler at backside in centrifugal pump?

hydtools: certainly a good simple explaination of pump-out vanes, also mentions front pump-out vanes as shown on the sketch in the article.

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.)

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