ASME Code Case 181

Charlie Chong
(2) Geometric. Ultrasonic indications of geometric and metallurgical origin
shall be classified as follows:
(a) Indications that are determined to originate from the surface
configurations (such as weld reinforcement or root geometry) or
variations in metallurgical structure of materials (such as cladding
to base metal interface) may be classified as geometric indications,
and
(1) need not be characterized or sized in accordance with ( i )(3)
below;
(2) need not be compared to allowable flaw acceptance criteria
of Table 1 or 2;
(3) the maximum indication amplitude and location shall be
recorded, for example: interna attachements, 200% DAC
maximum amplitude, 25 mm (1in.) above the weld centerline,
on the inside surface, from 90 to 95 deg.