Packed Joints Query

[SnTMan]

Hi all

Anybody know of a rational way to pressure-rate a packed joint?

This would be a type of joint using something like a stuffing box, rope packing and packing gland.

They are fairly common in S&T heat exchangers in the form of test rings, used for leak testing a shell/bundle at ambient temps with a shell cover removed.

Some customers seem suprised that we do not advise using them in 60" dia. at 700 psi, so a rational rating method would be very helpful.

Any ideas? Thanks in advance.

 

[deanc]

TEMA gives some good guidance. Look for packed tubesheets.

 

[SnTMan]

deanc, thanks

I am familiar w/ TEMA, but am hoping to find something a little more detailed. Perhaps as a function of dia, temp, clearances, # rings of packing, etc.

A definitive source would be good, so that any rating I come up with can be defended.

Got this question out on the Mech. Seals forum as well, maybe something will turn up.

Thanks again

 

[deanc]

Try

http://www.chesterton-marine.com

They have a calculator and links.

 

[SnTMan]

deanc, have contacted Chesterton. Thanks.

 

[arto]

There's an article on valve stem packing that might be of use:
"Study sheds new light on whether increased packing height seals a nuclear valve better" by R.P. Champagne in Power Magazine May 1976.