This is addressed to no one in particular but is for information only!
PVRC as well as many others including the Noted PRG (Paulin Reseach Group) have been and continue to do ongoing research and development on this topic. There has been various and sundry "improved" methods based upon the Klinger method from Europe.... much more is known today about this difficult subject than when the current design rulers were written.
When will the code(s) up date????? My guess is maybe never due to politics, and other numerous considerations other than the actual technical portion, but perhaps I'm being negative.
Some facts:
Design in accordance with the current rules does not provide any degree of leak
tightness per se.
It guarantees only that the bolted joint will not fail catastrophically under pressure all the while leaking perhaps.
External Moments converted to equivalent pressure may be conservative by a huge factor, often times leading people to think they have a problem when they don't.
Class 150 flanges are a bit flimsy and should be looked upon as such.
If you want to know more read some of the papers done by PVRC or any book published by Dr. John Bickford on the bolted joint.
Or keep posting nebulous questions in internet forums, getting some answers (good and bad perhaps) and pretend you know what is going on.
Best Regards,
John C. Luf
Cleveland Ohio U.S.A when I'm not in Austria
Member B31.3, Piping Engineer - Stress Analysis, Pipe Supports, Component Design, and Surge Analysis... according to my daughters master of unimportant trivia... <a href="http://suntzuquote.blogspot.com/">http://suntzuquote.blogspot.com/</a>
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[Non-text portions of this message have been removed] Received on Wed Nov 14 12:44:00 2007
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