New Requirements for TOFD Technique in ASME Code Part 1: Procedure Essentials

The new requirements for time of flight diffraction(TOFD) technique specified in the latest edition(2006 addenda) of the ASME Code were presented. The first part outlined the requirements for a TOFD written procedure and the TOFD system，the calibration items and the key points of an examination procedure. It primarily aimed at providing basis and reference for application of the new technology to pressure equipment in China.