API RP 581 - 3rd Ed.2016 - Add.2-2020 - Risk-Based Inspection Methodology
2.B-14 API RECOMMENDED PRACTICE 581Table 2.B.3.2—High Temperature Sulfidic and Naphthenic Acid Corrosion—Estimated CorrosionRates for Carbon Steel (mpy)Sulfur(wt%)TAN(mg/g)Temperature (°F)≤450 500 550 600 650 700 750 >7500.3 1 3 7 15 20 35 50 600.65 5 15 25 35 45 55 65 750.21.5 20 25 35 65 120 150 180 2003.0 30 60 60 120 150 160 240 2404.0 40 80 100 160 180 200 280 3000.3 1 4 10 20 30 50 70 800.65 5 10 15 25 40 60 80 900.41.5 8 15 25 35 50 75 90 1103.0 10 20 35 50 70 100 120 1304.0 20 30 50 70 90 120 140 1600.3 1 5 10 25 40 60 90 1000.65 5 10 15 30 50 80 110 1300.61.5 10 15 30 50 80 100 130 1503.0 15 30 50 80 100 120 140 1704.0 25 40 60 100 120 150 180 2000.3 2 5 15 30 50 80 110 1300.65 7 10 20 35 55 100 130 1501.51.5 15 20 35 55 100 120 140 1703.0 20 30 55 85 110 150 170 2004.0 30 45 75 120 140 180 200 2600.3 2 7 20 35 55 95 130 1500.65 7 10 30 45 60 120 140 1702.51.5 15 20 40 60 75 140 170 2003.0 20 35 60 90 120 170 200 2604.0 35 50 80 120 150 200 260 2800.3 2 8 20 40 60 100 140 1600.65 8 15 25 45 65 120 150 1703.01.5 20 25 35 65 120 150 180 2003.0 30 60 60 120 150 160 240 2404.0 40 80 100 160 180 200 280 300
RISK-BASED INSPECTION METHODOLOGY, PART 2, ANNEX 2.B—DETERMINATION OF CORROSION RATES 2.B-15Table 2.B.3.2M—High Temperature Sulfidic and Naphthenic Acid Corrosion—Estimated CorrosionRates for Carbon Steel (mm/y)Sulfur(wt%)TAN(mg/g)Temperature (°C)≤232 260 288 315 343 371 399 >3990.3 0.03 0.08 0.18 0.38 0.51 0.89 1.27 1.520.65 0.13 0.38 0.64 0.89 1.14 1.40 1.65 1.910.21.5 0.51 0.64 0.89 1.65 3.05 3.81 4.57 5.083.0 0.76 1.52 1.52 3.05 3.81 4.06 6.10 6.104.0 1.02 2.03 2.54 4.06 4.57 5.08 7.11 7.620.3 0.03 0.10 0.25 0.51 0.76 1.27 1.78 2.030.65 0.13 0.25 0.38 0.64 1.02 1.52 2.03 2.290.41.5 0.20 0.38 0.64 0.89 1.27 1.91 2.29 2.793.0 0.25 0.51 0.89 1.27 1.78 2.54 3.05 3.304.0 0.51 0.76 1.27 1.78 2.29 3.05 3.56 4.060.3 0.03 0.13 0.25 0.64 1.02 1.52 2.29 2.540.65 0.13 0.25 0.38 0.76 1.27 2.03 2.79 3.300.61.5 0.25 0.38 0.76 1.27 2.03 2.54 3.30 3.813.0 0.38 0.76 1.27 2.03 2.54 3.05 3.56 4.324.0 0.64 1.02 1.52 2.54 3.05 3.81 4.57 5.080.3 0.05 0.13 0.38 0.76 1.27 2.03 2.79 3.300.65 0.18 0.25 0.51 0.89 1.40 2.54 3.30 3.811.51.5 0.38 0.51 0.89 1.40 2.54 3.05 3.56 4.323.0 0.51 0.76 1.40 2.16 2.79 3.81 4.32 5.084.0 0.76 1.14 1.91 3.05 3.56 4.57 5.08 6.600.3 0.05 0.18 0.51 0.89 1.40 2.41 3.30 3.810.65 0.18 0.25 0.76 1.14 1.52 3.05 3.56 4.322.51.5 0.38 0.51 1.02 1.52 1.91 3.56 4.32 5.083.0 0.51 0.89 1.52 2.29 3.05 4.32 5.08 6.604.0 0.89 1.27 2.03 3.05 3.81 5.08 6.60 7.110.3 0.05 0.20 0.51 1.02 1.52 2.54 3.56 4.060.65 0.20 0.38 0.64 1.14 1.65 3.05 3.81 4.323.01.5 0.51 0.64 0.89 1.65 3.05 3.81 4.57 5.083.0 0.76 1.52 1.52 3.05 3.81 4.06 6.10 6.104.0 1.02 2.03 2.54 4.06 4.57 5.08 7.11 7.62
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2.B-14 API RECOMMENDED PRACTICE 581
Table 2.B.3.2—High Temperature Sulfidic and Naphthenic Acid Corrosion—Estimated Corrosion
Rates for Carbon Steel (mpy)
Sulfur
(wt%)
TAN
(mg/g)
Temperature (°F)
≤450 500 550 600 650 700 750 >750
0.3 1 3 7 15 20 35 50 60
0.65 5 15 25 35 45 55 65 75
0.2
1.5 20 25 35 65 120 150 180 200
3.0 30 60 60 120 150 160 240 240
4.0 40 80 100 160 180 200 280 300
0.3 1 4 10 20 30 50 70 80
0.65 5 10 15 25 40 60 80 90
0.4
1.5 8 15 25 35 50 75 90 110
3.0 10 20 35 50 70 100 120 130
4.0 20 30 50 70 90 120 140 160
0.3 1 5 10 25 40 60 90 100
0.65 5 10 15 30 50 80 110 130
0.6
1.5 10 15 30 50 80 100 130 150
3.0 15 30 50 80 100 120 140 170
4.0 25 40 60 100 120 150 180 200
0.3 2 5 15 30 50 80 110 130
0.65 7 10 20 35 55 100 130 150
1.5
1.5 15 20 35 55 100 120 140 170
3.0 20 30 55 85 110 150 170 200
4.0 30 45 75 120 140 180 200 260
0.3 2 7 20 35 55 95 130 150
0.65 7 10 30 45 60 120 140 170
2.5
1.5 15 20 40 60 75 140 170 200
3.0 20 35 60 90 120 170 200 260
4.0 35 50 80 120 150 200 260 280
0.3 2 8 20 40 60 100 140 160
0.65 8 15 25 45 65 120 150 170
3.0
1.5 20 25 35 65 120 150 180 200
3.0 30 60 60 120 150 160 240 240
4.0 40 80 100 160 180 200 280 300
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