ASME Code Case 181
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Charlie Chong
ARTICLE 4
ULTRASONIC EXAMINATION METHODS FOR WELDS
T-434 CALIBRATION BLOCKS
T-434.1 General.
T-434.1.1 Reflectors. Specified reflectors (i.e., sidedrilled holes, flat bottom
holes, notches, etc.) shall be used to establish primary reference responses
of the equipment. An alternative reflector(s) may be used provided that the
alternative reflector(s) produces a sensitivity equal to or greater than the
specified reflector(s) (e.g., side-drilled holes in lieu of notches, flat bottom
holes in lieu of side-drilled holes).
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