API RP 934-A Addendum 2
Addendum 1 to Materials and Fabrication of 2 1/4Cr-1Mo, 2 1/4Cr-1Mo-1/4V, 3Cr-1Mo, and 3Cr-1Mo-1/4V Steel Heavy Wall Pressure Vessels for High-temperature, High-pressure Hydrogen Service, Second Edition
Amendment by American Petroleum Institute, 03/01/2012