Abstract: This article describes the major standard practices on phased array ultrasonic testing (PAUT) for pressure equipment presented in the updated edition of ASME Code(2013),Section Ⅴ NDE,Article 4.It is the first part:evaluation of two inspection methods of welds specified by the referencing Code Section on manufacture and design based on the different acceptance criteria,one is UT requirements for workmanship based acceptance criteria,another is UT requirements for fracture mechanics based acceptance criteria.A common ground of both standard practices is using Computer imaging (CI) techniques to inspect and evaluate welded joints of pressure equipment,and the second one specifically focuses on flaw characterization and sizing.The intention is to compare with our industrial standards and to look at our national condition,thus we can find out the gap and correct errors in this field,so that making the Chinese enterprises performing the referencing ASME Code Section rise to a higher level.