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Date: 04/13/01 at 4:21 PM
Posted by: Howard tring
E-mail: howard.tring@edwards.boc.com

In Reply to: Conductance of tubing posted by Janice on 04/12/01 at 2:11 PM:

From "Modern Vacuum Practice" Nigel Harris, page 232.
I'll give you this using mbar Janice, as the graph uses that unit.

For a 12 mm pipe 1m long C= 3 l/s @ 1 mbar and 30 l/s @ 10 mbar. Divide this by .3 as your pipe is .3m long. Then C= 10 and 100 l/sec respect.

For .6m 12mm pipe C=5 and 50 l/s

For the 20mm pipe C=100 at 1 mbar and 1000 at 10 mbar.

C is halved by doubling the length
C is increased by about 10x by doubling the diam.

Hope this helps,
Regards,
Howard

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  Re: Conductance of tubing Janice   Posted at: 04/20/01 (0)

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