API RP 581 - 3rd Ed.2016 - Add.2-2020 - Risk-Based Inspection Methodology
2.B-16 API RECOMMENDED PRACTICE 581Table 2.B.3.3—High Temperature Sulfidic and Naphthenic Acid Corrosion—Estimated CorrosionRates for 1 Cr-0.2 Mo, 1 Cr-0.5 Mo, 1.25Cr-0.5Mo, 2.25Cr-1Mo, and 3Cr-1Mo (mpy)Sulfur(wt%)TAN(mg/g)Temperature (°F)≤450 500 550 600 650 700 750 >7500.3 1 1 4 7 13 21 25 300.65 3 8 15 20 25 30 35 400.21.5 10 15 20 30 60 75 90 1003.0 15 30 30 60 75 85 120 1204.0 20 40 50 80 100 120 140 1600.3 1 2 5 10 20 30 35 400.65 3 5 8 15 20 30 40 450.41.5 4 8 15 20 25 40 45 553.0 5 10 20 25 35 50 60 654.0 10 15 25 35 45 60 70 800.3 1 3 6 15 25 40 45 500.65 3 5 8 20 30 45 55 600.81.5 5 8 15 25 40 50 65 753.0 7 15 25 40 50 60 70 854.0 12 20 30 50 60 75 90 1000.3 2 3 8 15 30 50 55 650.65 4 5 10 20 40 55 65 751.51.5 6 10 20 30 50 65 70 803.0 10 15 30 45 60 75 85 1004.0 15 20 35 60 75 90 100 1300.3 2 4 9 20 35 55 65 750.65 4 5 15 25 40 60 70 802.51.5 7 10 20 30 45 70 80 1003.0 10 15 30 45 60 80 100 1204.0 15 25 40 60 80 100 120 1400.3 2 4 10 20 35 60 70 800.65 5 8 15 25 40 70 75 853.01.5 10 15 20 30 60 75 90 1003.0 15 30 30 60 75 85 120 1204.0 20 40 50 80 100 120 140 160
RISK-BASED INSPECTION METHODOLOGY, PART 2, ANNEX 2.B—DETERMINATION OF CORROSION RATES 2.B-17Table 2.B.3.3M—High Temperature Sulfidic and Naphthenic Acid Corrosion—Estimated CorrosionRates for 1 Cr-0.2 Mo, 1 Cr-0.5 Mo, 1.25Cr-0.5Mo, 2.25Cr-1Mo, and 3Cr-1Mo (mm/y)Sulfur(wt%)TAN(mg/g)Temperature (°C)≤232 260 288 315 343 371 399 >3990.3 0.03 0.03 0.10 0.18 0.33 0.53 0.64 0.760.65 0.08 0.20 0.38 0.51 0.64 0.76 0.89 1.020.21.5 0.25 0.38 0.51 0.76 1.52 1.91 2.29 2.543.0 0.38 0.76 0.76 1.52 1.91 2.16 3.05 3.054.0 0.51 1.02 1.27 2.03 2.54 3.05 3.56 4.060.3 0.03 0.05 0.13 0.25 0.51 0.76 0.89 1.020.65 0.08 0.13 0.20 0.38 0.51 0.76 1.02 1.140.41.5 0.10 0.20 0.38 0.51 0.64 1.02 1.14 1.403.0 0.13 0.25 0.51 0.64 0.89 1.27 1.52 1.654.0 0.25 0.38 0.64 0.89 1.14 1.52 1.78 2.030.3 0.03 0.08 0.15 0.38 0.64 1.02 1.14 1.270.65 0.08 0.13 0.20 0.51 0.76 1.14 1.40 1.520.81.5 0.13 0.20 0.38 0.64 1.02 1.27 1.65 1.913.0 0.18 0.38 0.64 1.02 1.27 1.52 1.78 2.164.0 0.30 0.51 0.76 1.27 1.52 1.91 2.29 2.540.3 0.05 0.08 0.20 0.38 0.76 1.27 1.40 1.650.65 0.10 0.13 0.25 0.51 1.02 1.40 1.65 1.911.51.5 0.15 0.25 0.51 0.76 1.27 1.65 1.78 2.033.0 0.25 0.38 0.76 1.14 1.52 1.91 2.16 2.544.0 0.38 0.51 0.89 1.52 1.91 2.29 2.54 3.300.3 0.05 0.10 0.23 0.51 0.89 1.40 1.65 1.910.65 0.10 0.13 0.38 0.64 1.02 1.52 1.78 2.032.51.5 0.18 0.25 0.51 0.76 1.14 1.78 2.03 2.543.0 0.25 0.38 0.76 1.14 1.52 2.03 2.54 3.054.0 0.38 0.64 1.02 1.52 2.03 2.54 3.05 3.560.3 0.05 0.10 0.25 0.51 0.89 1.52 1.78 2.030.65 0.13 0.20 0.38 0.64 1.02 1.78 1.91 2.163.01.5 0.25 0.38 0.51 0.76 1.52 1.91 2.29 2.543.0 0.38 0.76 0.76 1.52 1.91 2.16 3.05 3.054.0 0.51 1.02 1.27 2.03 2.54 3.05 3.56 4.06
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2.B-16 API RECOMMENDED PRACTICE 581
Table 2.B.3.3—High Temperature Sulfidic and Naphthenic Acid Corrosion—Estimated Corrosion
Rates for 1 Cr-0.2 Mo, 1 Cr-0.5 Mo, 1.25Cr-0.5Mo, 2.25Cr-1Mo, and 3Cr-1Mo (mpy)
Sulfur
(wt%)
TAN
(mg/g)
Temperature (°F)
≤450 500 550 600 650 700 750 >750
0.3 1 1 4 7 13 21 25 30
0.65 3 8 15 20 25 30 35 40
0.2
1.5 10 15 20 30 60 75 90 100
3.0 15 30 30 60 75 85 120 120
4.0 20 40 50 80 100 120 140 160
0.3 1 2 5 10 20 30 35 40
0.65 3 5 8 15 20 30 40 45
0.4
1.5 4 8 15 20 25 40 45 55
3.0 5 10 20 25 35 50 60 65
4.0 10 15 25 35 45 60 70 80
0.3 1 3 6 15 25 40 45 50
0.65 3 5 8 20 30 45 55 60
0.8
1.5 5 8 15 25 40 50 65 75
3.0 7 15 25 40 50 60 70 85
4.0 12 20 30 50 60 75 90 100
0.3 2 3 8 15 30 50 55 65
0.65 4 5 10 20 40 55 65 75
1.5
1.5 6 10 20 30 50 65 70 80
3.0 10 15 30 45 60 75 85 100
4.0 15 20 35 60 75 90 100 130
0.3 2 4 9 20 35 55 65 75
0.65 4 5 15 25 40 60 70 80
2.5
1.5 7 10 20 30 45 70 80 100
3.0 10 15 30 45 60 80 100 120
4.0 15 25 40 60 80 100 120 140
0.3 2 4 10 20 35 60 70 80
0.65 5 8 15 25 40 70 75 85
3.0
1.5 10 15 20 30 60 75 90 100
3.0 15 30 30 60 75 85 120 120
4.0 20 40 50 80 100 120 140 160
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