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zaheer dabir
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Join Date: Jan 2009
Posts: 3

Mechanical Seals - Face Flatness

01/22/2009 5:26 AM

What is the flattness of Mechanical Seal faces at

1 Light Band & 2 Light Band?
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sb
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Join Date: Mar 2007
Posts: 2550
Good Answers: 103
#1

Re: Mechanical Seals - Face Flatness

01/22/2009 8:55 AM

Normally we procure our seals (and specify them) to 2 light bands.

However it all depends on your application parameters, media sealed, amount of leakage acceptable etc. The amount of flatness can not be generalised - An ideal surface must be the best - however that shoots up the cost of manufacturing and hence the cost of the seal.

A site of interest may be

http://www.mcnallyinstitute.com/06-html/6-03.html

Also one of my frequently visited site has an article on this aspect

http://www.machinerylubrication.com/article_detail.asp?articleid=1295

__________________
 Fantastic ideas for a Fantastic World, I make the illogical logical.They put me in cars,they put me in yer tv.They put me in stereos and those little radios you stick in your ears.They even put me in watches, they have teeny gremlins for your watches
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Ed Weldon
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#2
In reply to #1

Re: Mechanical Seals - Face Flatness

01/22/2009 11:15 PM

sb -- GA. Those two links are full of excellent information. Both are keepers for my engineering files. Thanks, Ed Weldon
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sb
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Posts: 2550
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#3
In reply to #2

Re: Mechanical Seals - Face Flatness

01/23/2009 1:07 AM

Welcome.

Do not forget the link in the first where sample patterns are shown for the interference bands.

__________________
 Fantastic ideas for a Fantastic World, I make the illogical logical.They put me in cars,they put me in yer tv.They put me in stereos and those little radios you stick in your ears.They even put me in watches, they have teeny gremlins for your watches
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Ed Weldon
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Join Date: Oct 2008
Location: I'm outa here
Posts: 1924
Good Answers: 196
#4
In reply to #3

Re: Mechanical Seals - Face Flatness

01/23/2009 1:21 AM

sb --- I underate you. Like Warren Buffet; you seem to have the ability to see around corners. Thanks.

BTW McNally is an excellent source for pump information. I've barely scratched the subject there.

Ed Weldon
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