48-GP-6a

1. SCOPE 1.1 This publication provides instructions for the ultrasonic inspection of butt joints in material over 6 mm (0.2 inch) thichness, and in tee and corner joints where suitable testing procedures can be established. It also provides an outline of minimum equipment requirements, methods of calibrating the equipment, and technical information on ultrasonics. 1.2 The two appendices to this publications are provides as illustrations of specific ultrasonic procedures and acceptance limits for welded joints in pressure vessels and steel structures. These include: Appendix A - Excerpts from ASME Boiler and Pressure Vessel Code: Section V - Nondestructive Examination (1974 Edition) Article 5 - Ultrasonic Examination, par. T 510 - T 539. Section III - Nuclear Power Plant Components (1974) Edition Subsection NG-Core Support Structures, par. NG 5330 - Ultrasonic Acceptance Standards. Appendix B - Excerpt from CSA Standard W 59: Specification for Welding of Steel Structures (1974 Revision); Section 8 - Ultrasonic Examination of Groove Welds.