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Q15. During an internal inspection of a tank, pitting that measures 0.30 inches<br />
deep was found in the shell (0.625 Thickness). The required thickness of the<br />
shell in this area is 0.5 inches. Based on the above information should a<br />
repair be made?<br />
a) Yes<br />
b) No<br />
c) The inspector option<br />
d) Repair Contractor's option<br />
REF: <strong>API</strong> 653- 4.3.2.2<br />
ANS: (b)<br />
4.3.2.2 Widely scattered pits may be ignored provided that:<br />
a. no pit depth results in the remaining shell thickness being less than onehalf<br />
the minimum acceptable tank shell thickness exclusive of the corrosion<br />
allowance; and<br />
b. the sum of their dimensions along any vertical line does not exceed 2 in. in<br />
an 8-in. length (see Figure 4.2).<br />
Charlie Chong/ Fion Zhang
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