Flinger discs - advantages/disadvantages? 1

[relentlessratt]

what are the advantages and disadvantages of finger discs when compared to oil rings?
i know that oil rings can hang up or skip.

 

[electricpete]

Heinz Bloch wrote a paper discussing this. You hit it on the nose about the problem with oil rings. The problem shows up when the D*N gets to large. As I recall Heinz Bloch recommended oil rings should not be used above around D*N = 8000 rpm*inch. (I forget whether that's inner diameter or mean diameter)

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[electricpete]

The paper that I was referring to is here:

http://www.heinzbloch.com/hb_tech_pap_download.htm

See the link entitled 'Centrifugal pump cooling and lubricant application: A "best technology" update'

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[relentlessratt]

thanks electricpete, i read this article some years ago. strangely enough, 90% of the pumps i have seen with oil rings exceed the D*N limit.
anyways, the article had no mention about disadvantages of finger discs and i never heard of anyone having bad experinece with them. so, i was just wondering if there are disadvantage and what are they?