How to use RB-C in Appendix K for standard 47013?

2017-09-18View Original

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Regarding the distance-amplitude curve for testing boiler and pressure vessel test blocks, when the pipe’s radius of curvature is between 80 and 250, standard 47013 requires the use of RB-C from Appendix K. Is this mandatory? For example, when testing the circumferential welds of pipes with a diameter of φ325, it is not only necessary to use RB-C test blocks but also to grind the probe so that it fits closely along the axis of the pipe. So, in the case of detecting transverse defects, the probe certainly cannot fit tightly against the workpiece; does this mean another probe needs to be used? If a new probe is used, then the K value, the front edge, and the curve all need to be recreated. What should be done in such situations?

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How to use RB-C in Appendix K for standard 47013?

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