API RP 581 - 3rd Ed.2016 - Add.2-2020 - Risk-Based Inspection Methodology

2.C-8 API RECOMMENDED PRACTICE 581
2.C.5.2 Tables
Table 2.C.5.1—LoIE Example for AST Shell Course Internal Corrosion
Inspection
Category
A
B
Inspection
Effectiveness
Category
Highly
Effective
Usually
Effective
Inspection a
Both inspections shall be done:
— intrusive inspection—good visual inspection with pit depth gage measurements
at suspect locations
— UT scanning follow up on suspect location and as general confirmation of wall
thickness
Both inspections shall be done:
— external spot UT scanning based on visual information from previous internal
inspection of this AST or similar service ASTs
— internal video survey with external UT follow-up
C Fairly Effective External spot UT scanning based at suspect locations without benefit of any internal
inspection information on AST type or service
D
Poorly
Effective
External spot UT based at suspect locations without benefit of any internal
inspection information on AST type or service
E Ineffective Ineffective inspection technique/plan was utilized
a
Inspection quality is high.