Dear everybody,

Does anybody know why some of the allowables of ASME B31.4 2012 has been increased so notorously?. For instance the additive longitudinal allowable stress in the 2009 edition was 0,75x0,72xSMYS, just like it was during previous editions, but in the 2012 edition it is now 0,9 SMYS or 0,75xSMYS.

Your comments will be appreciated.

Regards
Patricio Alvarez