API RP 581 - 3rd Ed.2016 - Add.2-2020 - Risk-Based Inspection Methodology
2.B-28 API RECOMMENDED PRACTICE 581Table 2.B.3.9—High Temperature Sulfidic and Naphthenic Acid Corrosion—Estimated CorrosionRates for 316 SS with < 2.5 % Mo (mpy)Sulfur(wt%)TAN(mg/g)Temperature (°F)≤450 500 550 600 650 700 750 >7500.2 1 1 1 1 1 1 1 10.23.0 1 1 1 1 1 2 2 24.0 1 1 1 2 4 5 7 100.2 1 1 1 1 1 1 1 10.43.0 1 1 1 1 2 2 2 24.0 1 1 2 3 4 5 7 100.2 1 1 1 1 1 1 1 10.83.0 1 1 1 1 2 2 2 34.0 1 1 2 3 5 5 7 100.2 1 1 1 1 1 1 1 11.53.0 1 1 1 1 3 3 3 44.0 1 1 3 5 5 5 7 100.2 1 1 1 1 1 1 1 12.53.0 1 1 1 2 3 3 4 54.0 1 1 3 5 5 6 8 100.2 1 1 1 1 1 1 1 23.03.0 1 1 1 2 4 5 5 64.0 1 2 3 5 5 6 8 10NOTEIncludes stainless steels with < 2.5 % Mo, e.g. 316, 316L, 316H, etc.
RISK-BASED INSPECTION METHODOLOGY, PART 2, ANNEX 2.B—DETERMINATION OF CORROSION RATES 2.B-29Table 2.B.3.9M—High Temperature Sulfidic and Naphthenic Acid Corrosion—Estimated CorrosionRates for 316 SS with < 2.5 % Mo (mm/y)Sulfur(wt%)TAN(mg/g)Temperature (°C)≤232 260 288 315 343 371 399 >3990.2 0.03 0.03 0.03 0.03 0.03 0.03 0.03 0.030.23.0 0.03 0.03 0.03 0.03 0.03 0.05 0.05 0.054.0 0.03 0.03 0.03 0.05 0.10 0.13 0.18 0.250.2 0.03 0.03 0.03 0.03 0.03 0.03 0.03 0.030.43.0 0.03 0.03 0.03 0.03 0.05 0.05 0.05 0.054.0 0.03 0.03 0.05 0.08 0.10 0.13 0.18 0.250.2 0.03 0.03 0.03 0.03 0.03 0.03 0.03 0.030.83.0 0.03 0.03 0.03 0.03 0.05 0.05 0.05 0.084.0 0.03 0.03 0.05 0.08 0.13 0.13 0.18 0.250.2 0.03 0.03 0.03 0.03 0.03 0.03 0.03 0.031.53.0 0.03 0.03 0.03 0.03 0.08 0.08 0.08 0.104.0 0.03 0.03 0.08 0.13 0.13 0.13 0.18 0.250.2 0.03 0.03 0.03 0.03 0.03 0.03 0.03 0.032.53.0 0.03 0.03 0.03 0.05 0.08 0.08 0.10 0.134.0 0.03 0.03 0.08 0.13 0.13 0.15 0.20 0.250.2 0.03 0.03 0.03 0.03 0.03 0.03 0.03 0.053.03.0 0.03 0.03 0.03 0.05 0.10 0.13 0.13 0.154.0 0.03 0.05 0.08 0.13 0.13 0.15 0.20 0.25NOTEIncludes stainless steels with < 2.5 % Mo, e.g. 316, 316L, 316H, etc.
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RISK-BASED INSPECTION METHODOLOGY, PART 2, ANNEX 2.B—DETERMINATION OF CORROSION RATES 2.B-29
Table 2.B.3.9M—High Temperature Sulfidic and Naphthenic Acid Corrosion—Estimated Corrosion
Rates for 316 SS with < 2.5 % Mo (mm/y)
Sulfur
(wt%)
TAN
(mg/g)
Temperature (°C)
≤232 260 288 315 343 371 399 >399
0.2 0.03 0.03 0.03 0.03 0.03 0.03 0.03 0.03
0.2
3.0 0.03 0.03 0.03 0.03 0.03 0.05 0.05 0.05
4.0 0.03 0.03 0.03 0.05 0.10 0.13 0.18 0.25
0.2 0.03 0.03 0.03 0.03 0.03 0.03 0.03 0.03
0.4
3.0 0.03 0.03 0.03 0.03 0.05 0.05 0.05 0.05
4.0 0.03 0.03 0.05 0.08 0.10 0.13 0.18 0.25
0.2 0.03 0.03 0.03 0.03 0.03 0.03 0.03 0.03
0.8
3.0 0.03 0.03 0.03 0.03 0.05 0.05 0.05 0.08
4.0 0.03 0.03 0.05 0.08 0.13 0.13 0.18 0.25
0.2 0.03 0.03 0.03 0.03 0.03 0.03 0.03 0.03
1.5
3.0 0.03 0.03 0.03 0.03 0.08 0.08 0.08 0.10
4.0 0.03 0.03 0.08 0.13 0.13 0.13 0.18 0.25
0.2 0.03 0.03 0.03 0.03 0.03 0.03 0.03 0.03
2.5
3.0 0.03 0.03 0.03 0.05 0.08 0.08 0.10 0.13
4.0 0.03 0.03 0.08 0.13 0.13 0.15 0.20 0.25
0.2 0.03 0.03 0.03 0.03 0.03 0.03 0.03 0.05
3.0
3.0 0.03 0.03 0.03 0.05 0.10 0.13 0.13 0.15
4.0 0.03 0.05 0.08 0.13 0.13 0.15 0.20 0.25
NOTE
Includes stainless steels with < 2.5 % Mo, e.g. 316, 316L, 316H, etc.
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