purpose of wear ring in impeller and casing in suction side of pump

[pradeep4u]

Dear All
what is the purpose of wear ring in impeller and casing in suction side.
Regards
Pradeep

 

[LittleInch]

did you try any research?

This decent explanation took me 10 seconds to find...

https://www.engineersedge.com/pumps...eable rings,impeller or pump casing material.

Remember - More details = better answers
Also: If you get a response it's polite to respond to it.

 

[pradeep4u]

Dear littleinch
I know this but apart from this I wanted to know how does increased wear ring gap affects pump bearing life. Does it also acts as a bearing.
Regards
Pradeep

 

[Artisi]

There are numerous other things that effect bearing before considering wear ring clearance. As for the second question - NO.

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.)

 

[JJPellin]

Any close clearance bushing or wear ring with a pressure differential across it will provide some support for the rotor. Internet search for Lomakin Effect.

Johnny Pellin

 

[pradeep4u]

Thanks to all for your precious inputs. I want to ask one more question regarding to boiler feed pump journal bearing and bearing top cover interference. We use HDB 125/9 KSB make pump. it has 9 stages. In journal bearing at DE AND NDE side we keep interference of 0.06mm between bearing and bearing top cover. I just want to ask why inteference is kept. Please give your valuable suggestions
Regards
Pradeep

 

[Artisi]

Seems you have opened a second post to address the last question.

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.)

 

[pradeep4u]

Dear All
Thanks for your valuable guidance.
Regard
Pradeep