This document is the updated 2014 edition of the ASME Section VIII – Division 2 Criteria and Commentary. This edition incorporates changes into the criteria and commentary that have occurred between the 2009 Addenda and the 2013 edition of the ASME B&PV Code, Section VIII, Division. Valuable background information is provided to assist users in using the Code. This document will be updated as required to keep pace with future developments in Section VIII, Division 2.