Table 2 Significant of intensity zones (Gostautas et al., 2005).

A^a

Insignificant AE

B^b

Note for reference in future tests. Typically minor surface defects, such as corrosion, pitting, gouges, or crack attachments welds

C

Defects requiring follow-up evaluation, which may be based on further data analysis or complementary non-destructive examination

D

Significant defect requiring follow-up inspection

E

Major defect requiring immediate shut-down and follow-up inspection