API RP 581 - 3rd Ed.2016 - Add.2-2020 - Risk-Based Inspection Methodology
RISK-BASED INSPECTION METHODOLOGY, PART 2, ANNEX 2.C—LEVELS OF INSPECTION EFFECTIVENESS 2.C-25abcdInspectionCategoryInspectionEffectivenessCategoryTable 2.C.10.3—LoIE Example for CUIInsulation Removeda, b, c, dInsulationA Highly Effective For the total surface area:100 % external visual inspection prior toremoval of insulationBUsuallyEffectiveANDRemove 100 % of the insulation fordamaged or suspected areasAND100 % visual inspection of the exposedsurface area with UT, RT, or pit gaugefollow-up of the selected corroded areasFor the total surface area:100 % external visual inspection prior toremoval of insulationANDRemove >50 % of suspect areasANDFollow-up of corroded areas with 100 %visual inspection of the exposed surfacearea with UT, RT, or pit gaugeC Fairly Effective For the total surface area:100 % external visual inspection prior toremoval of insulationANDRemove >25 % of suspect areasANDFollow-up of corroded areas with 100 %visual inspection of the exposed surfacearea with UT, RT, or pit gaugeD Poorly Effective For the total surface area:100 % external visual inspection prior toremoval of insulationANDRemove >5 % of total surface area ofinsulation including suspect areasANDFollow-up of corroded areas with 100 %visual inspection of the exposed surfacearea with UT, RT, or pit gaugeE Ineffective Ineffective inspection technique/plan wasutilizedNot RemovedFor the total surface area:100 % external visual inspectiona, b, c, dAND100 % profile or real-time radiographyof damaged or suspect areaANDFollow-up of corroded areas with 100 %visual inspection of the exposed surfacewith UT, RT, or pit gaugeFor the total surface area:100 % external visual inspectionANDFollow-up with profile or real-timeradiography of >65 % of suspect areasANDFollow-up of corroded areas with 100 %visual inspection of the exposed surfacewith UT, RT, or pit gaugeFor the total surface area:100 % external visual inspectionANDFollow-up with profile or real-timeradiography of >35 % of suspect areasANDFollow-up of corroded areas with 100 %visual inspection of the exposed surfacewith UT, RT, or pit gaugeFor the total surface area:100 % external visual inspectionANDFollow-up with profile or real-timeradiography of >5 % of total surfacearea of insulation including suspectareasANDFollow-up of corroded areas with 100 %visual inspection of the exposed surfacewith UT, RT, or pit gaugeIneffective inspection technique/plan wasutilizedInspection quality is high.Suspect area shall be considered the total surface area unless defined by knowledgeable individual (subject matter expert).Suspect areas include damaged insulation, penetrations, terminations, etc.Surface preparation is sufficient to detect minimum wall for the NDE technique used to measure thickness.
2.C-26 API RECOMMENDED PRACTICE 581Table 2.C.10.4—LoIE Example for CUI ClSCCInspectionCategoryInspectionEffectivenessCategoryInsulation Removed aInsulation Not Removed aAHighlyEffectiveFor the suspected area:100 % external visual inspection priorto removal of insulationNo inspection techniques are yetavailable to meet the requirements foran “A” level inspectionAND>100 % dye penetrant or eddy currenttest with UT follow-up of relevantindicationsBUsuallyEffectiveFor the suspected area:100 % external visual inspection priorto removal of insulationNo inspection techniques are yetavailable to meet the requirements for a“B” level inspectionAND>60 % dye penetrant or eddy currenttesting with UT follow-up of allrelevant indicationsC Fairly Effective For the suspected area:100 % external visual inspection priorto removal of insulationNo inspection techniques are yetavailable to meet the requirements for a“C” level inspectionAND>30 % dye penetrant or eddy currenttesting with UT follow-up of allrelevant indicationsDPoorlyEffectiveFor the suspected area:100 % external visual inspection priorto removal of insulationNo inspection techniques are yetavailable to meet the requirements for a“D” level inspectionAND>5 % dye penetrant or eddy currenttesting with UT follow-up of allrelevant indicationsE Ineffective Ineffective inspection technique/planwas utilizedIneffective inspection technique/planwas utilizedaInspection quality is high.
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- Page 349 and 350: CONTENTSOVERVIEW ..................
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2.C-26 API RECOMMENDED PRACTICE 581
Table 2.C.10.4—LoIE Example for CUI ClSCC
Inspection
Category
Inspection
Effectiveness
Category
Insulation Removed a
Insulation Not Removed a
A
Highly
Effective
For the suspected area:
100 % external visual inspection prior
to removal of insulation
No inspection techniques are yet
available to meet the requirements for
an “A” level inspection
AND
>100 % dye penetrant or eddy current
test with UT follow-up of relevant
indications
B
Usually
Effective
For the suspected area:
100 % external visual inspection prior
to removal of insulation
No inspection techniques are yet
available to meet the requirements for a
“B” level inspection
AND
>60 % dye penetrant or eddy current
testing with UT follow-up of all
relevant indications
C Fairly Effective For the suspected area:
100 % external visual inspection prior
to removal of insulation
No inspection techniques are yet
available to meet the requirements for a
“C” level inspection
AND
>30 % dye penetrant or eddy current
testing with UT follow-up of all
relevant indications
D
Poorly
Effective
For the suspected area:
100 % external visual inspection prior
to removal of insulation
No inspection techniques are yet
available to meet the requirements for a
“D” level inspection
AND
>5 % dye penetrant or eddy current
testing with UT follow-up of all
relevant indications
E Ineffective Ineffective inspection technique/plan
was utilized
Ineffective inspection technique/plan
was utilized
a
Inspection quality is high.
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