Posted by: Aaron
yielding - 09/18/05 11:48 AM
Gentlemen,
There is some confusion in my circle relating to plastic flow due to expansion effects, perhaps Messrs John Breen,John Luf et al can enlighten us and explain this apparent contradiction.
Para 319.2.3 of the piping code B31.3 (2002) quotes "(a) In contrast with stresses from sustained loads, such as internal pressure or weight, displacement stresses may be permitted to attain sufficient magnitude to cause local yielding in various portions of the piping system"
Contrasting this a quotation from page 39 of the MW Kellogg Design of Piping Systems " The allowable stress range limits established by the Piping Code are such that plastic flow due to expansion effects is not permitted to occur with each cycle."
I look forward to your comments
Regards
A
There is some confusion in my circle relating to plastic flow due to expansion effects, perhaps Messrs John Breen,John Luf et al can enlighten us and explain this apparent contradiction.
Para 319.2.3 of the piping code B31.3 (2002) quotes "(a) In contrast with stresses from sustained loads, such as internal pressure or weight, displacement stresses may be permitted to attain sufficient magnitude to cause local yielding in various portions of the piping system"
Contrasting this a quotation from page 39 of the MW Kellogg Design of Piping Systems " The allowable stress range limits established by the Piping Code are such that plastic flow due to expansion effects is not permitted to occur with each cycle."
I look forward to your comments
Regards
A