Select this option to consider pitting data. This option is only available when Flaw Type is set to Part 6 (Pitting).
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Level 1 Assessment - The surface damage is measured in terms of pitted area, and the maximum pit depth is used to quantify the extent of pitting damage. You can use the standard pit charts (see Figures 6.6 to 6.13) to compare the actual damage on the component to the damage represented on the pit chart. The pit chart and an estimate of the maximum pit depth are used to determine acceptability. A cross-sectional UT thickness scan can determine the pitting profile. Guidelines for determining the maximum pit depth are in paragraph 6.3.4.1 of the code.
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Level 2 Assessment - The surface damage is measured using a pit-couple (two pits separated by a solid ligament; see Figure 6.14). The metal loss of each pit in a pit-couple is modeled as an equivalent cylinder. The diameter and depth of each pit, and the distance between the pit centers are also required. The orientation of the pit-couple in the biaxial stress field can also be included in the assessment (see Figure 6.14). The depth and diameter of a pit should be carefully measured because of the variety of pit types that can occur in service (see Figure 6.5). If the pit has an irregular shape, you should use a diameter and depth that encompasses the entire shape for the assessment.
