American Society of Mechanical Engineers

The 2013 Edition of the codes includes a 'no addenda service', meaning that all changes are incorporated into the appropriate page and each affected area is identified, with a designator corresponding to the new Edition.
Each Section of the 2013 Edition also includes a summary of changes that lists the material affected by the change, plus the nature of the change.
With the release of the 2013 ASME BPVC, the Code will be moving from a three-year to a two-year cycle.