Let me also add to the WRC Bulletin list some recent work by E.C. Rodabaugh and E.A. Wais:

WRC Bulletin 448 (January, 2000)
Title - Evaluation of Welded Attachments on Pipe and Elbows

This bulletin provides 2 reports from Everett and Ed which apply to the Section III Piping Code. However you can look further and taken together with the WRC Bulletins listed by Rich above this new work can provide some additional insight into the sometimes enigmatic topic of welding appurtenances onto pipes (or vessels). Also, this is a good look at how SIF are developed for configurations other than those shown in B31 Appendix "D".

I am adding this web address today (on 21VIII00) for those of you who would like more information on WRC bulletins. There is availability and pricing data at this address:
http://www.forengineers.org/pvrc/BULLETIN3.htm


[This message has been edited by John Breen (edited August 21, 2000).]