API RP 581 - 3rd Ed.2016 - Add.2-2020 - Risk-Based Inspection Methodology
2-40 API RECOMMENDED PRACTICE 581Table 5.3—Data Required for Determination of the Lining DFType of liningRequired DataAge of lining (years)CommentsSee Table 5.4 and Table 5.5, as applicableAge of lining, or years since last A or B effective inspection (i.e. since lastthorough visual inspection or other appropriate method)Lining condition Condition of lining based on Table 5.6On-line monitoring for lining failureOn-line monitoringDamage factor Thinning DF determined as in Section 4Table 5.4—Lining DFs—Inorganic LiningsYears SinceLastThoroughVisualInspectionStrip LinedAlloy(Resistant)CastableRefractoryDF As a Function of Inorganic Lining TypeCastableRefractorySevereConditionsGlass Lined Acid Brick Fiberglass1 0.3 0.5 9 3 0.01 12 0.5 1 40 4 0.03 13 0.7 2 146 6 0.05 14 1 4 428 7 0.15 15 1 9 1017 9 1 16 2 16 1978 11 1 17 3 30 3000 13 1 28 4 53 3000 16 1 39 6 89 3000 20 2 710 9 146 3000 25 3 1311 12 230 3000 30 4 2612 16 351 3000 36 5 4713 22 518 3000 44 7 8214 30 738 3000 53 9 13915 40 1017 3000 63 11 22816 53 1358 3000 75 15 35917 69 1758 3000 89 19 54818 89 2209 3000 105 25 80819 115 2697 3000 124 31 115120 146 3000 3000 146 40 158721 184 3000 3000 170 50 211922 230 3000 3000 199 63 274323 286 3000 3000 230 78 300024 351 3000 3000 266 97 300025 428 3000 3000 306 119 3000
RISK-BASED INSPECTION METHODOLOGY, PART 2—PROBABILITY OF FAILURE METHODOLOGY 2-41Table 5.5—Lining DFs—Organic LiningsYears inServiceLow-quality ImmersionGrade Coating (SprayApplied, to 40 mils)Medium-quality ImmersionGrade Coating (Filled, TrowelApplied, to 80 mils)High-quality Immersion GradeCoating (Reinforced, TrowelApplied, ≥80 mils)1 30 1 0.12 89 4 0.133 230 16 0.154 518 53 0.175 1017 146 0.26 1758 351 17 2697 738 48 3000 1358 169 3000 2209 5310 3000 3000 14611 3000 3000 35112 3000 3000 73813 3000 3000 135814 3000 3000 220915 3000 3000 300016 3000 3000 300017 3000 3000 300018 3000 3000 300019 3000 3000 300020 3000 3000 300021 3000 3000 300022 3000 3000 300023 3000 3000 300024 3000 3000 300025 3000 3000 3000
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RISK-BASED INSPECTION METHODOLOGY, PART 2—PROBABILITY OF FAILURE METHODOLOGY 2-41
Table 5.5—Lining DFs—Organic Linings
Years in
Service
Low-quality Immersion
Grade Coating (Spray
Applied, to 40 mils)
Medium-quality Immersion
Grade Coating (Filled, Trowel
Applied, to 80 mils)
High-quality Immersion Grade
Coating (Reinforced, Trowel
Applied, ≥80 mils)
1 30 1 0.1
2 89 4 0.13
3 230 16 0.15
4 518 53 0.17
5 1017 146 0.2
6 1758 351 1
7 2697 738 4
8 3000 1358 16
9 3000 2209 53
10 3000 3000 146
11 3000 3000 351
12 3000 3000 738
13 3000 3000 1358
14 3000 3000 2209
15 3000 3000 3000
16 3000 3000 3000
17 3000 3000 3000
18 3000 3000 3000
19 3000 3000 3000
20 3000 3000 3000
21 3000 3000 3000
22 3000 3000 3000
23 3000 3000 3000
24 3000 3000 3000
25 3000 3000 3000
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