SUBSECTION B
API ICP Self Study Materials
API ICP Self Study Materials
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UW-52 (c)<br />
Degree of RT<br />
Unacceptable imperfections<br />
Spot<br />
1. indication characterized as a crack or zone of incomplete fusion or<br />
penetration.<br />
2. Welds having indications characterized as slag inclusions or cavities<br />
are unacceptable when;<br />
a. the indication length exceeds 2/3 t, where t is defined as shown in<br />
UW-51(b)(2).<br />
b. For all thicknesses, indications less than ¼ in. (6 mm) are acceptable,<br />
and indications greater than ¾ in. (19 mm) are unacceptable.<br />
c. Multiple aligned indications meeting these acceptance criteria are<br />
acceptable when the sum of their longest dimensions indications does<br />
not exceed t within a length of 6t (or proportionally for radiographs<br />
shorter than 6t), and when the longest length L for each indication is<br />
separated by a distance not less than 3L from adjacent indications.<br />
(3) Rounded indications are not a factor in the acceptability of welds not<br />
required to be fully radiographed.<br />
Fion Zhang/ Charlie Chong<br />
UW-52
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