Bob Rasooli explains about RT 2 radiography on ASME VIII Div.1 pressure vessel. With RT 2 pressure vessel radiography, the pressure vessel shall be subjected to full radiography on the longitudinal seams and spot on the circumferential joints, and joint efficiency is 1 on the design formula. This subject is the common question on the ASME course, API 510 pressure vessel inspector exam and the API SIFE (source inspector fixed equipment) exam.