what is purpose to provide backvanes on empiler at backside in centrifugal pump? 1

[yatinrajput]

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

 

[hydtools]

To evacuate pumped material from behind the impeller.

Ted

 

[Compositepro]

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

 

[Compositepro]

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

 

[psv1990]

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.

 

[Artisi]

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.)

 

[electricpete]

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

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

 

[Artisi]

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.)

 

[hydtools]

Here is Lawrence information on their product.

http://www.lawrencepumps.com/Newsletter/news_v01_i1_june.html

Ted

 

[Artisi]

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.)