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API RP 581 - 3rd Ed.2016 - Add.2-2020 - Risk-Based Inspection Methodology

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RISK-BASED INSPECTION METHODOLOGY, PART 2, ANNEX 2.B—DETERMINATION OF CORROSION RATES 2.B-15

Table 2.B.3.2M—High Temperature Sulfidic and Naphthenic Acid Corrosion—Estimated Corrosion

Rates for Carbon Steel (mm/y)

Sulfur

(wt%)

TAN

(mg/g)

Temperature (°C)

≤232 260 288 315 343 371 399 >399

0.3 0.03 0.08 0.18 0.38 0.51 0.89 1.27 1.52

0.65 0.13 0.38 0.64 0.89 1.14 1.40 1.65 1.91

0.2

1.5 0.51 0.64 0.89 1.65 3.05 3.81 4.57 5.08

3.0 0.76 1.52 1.52 3.05 3.81 4.06 6.10 6.10

4.0 1.02 2.03 2.54 4.06 4.57 5.08 7.11 7.62

0.3 0.03 0.10 0.25 0.51 0.76 1.27 1.78 2.03

0.65 0.13 0.25 0.38 0.64 1.02 1.52 2.03 2.29

0.4

1.5 0.20 0.38 0.64 0.89 1.27 1.91 2.29 2.79

3.0 0.25 0.51 0.89 1.27 1.78 2.54 3.05 3.30

4.0 0.51 0.76 1.27 1.78 2.29 3.05 3.56 4.06

0.3 0.03 0.13 0.25 0.64 1.02 1.52 2.29 2.54

0.65 0.13 0.25 0.38 0.76 1.27 2.03 2.79 3.30

0.6

1.5 0.25 0.38 0.76 1.27 2.03 2.54 3.30 3.81

3.0 0.38 0.76 1.27 2.03 2.54 3.05 3.56 4.32

4.0 0.64 1.02 1.52 2.54 3.05 3.81 4.57 5.08

0.3 0.05 0.13 0.38 0.76 1.27 2.03 2.79 3.30

0.65 0.18 0.25 0.51 0.89 1.40 2.54 3.30 3.81

1.5

1.5 0.38 0.51 0.89 1.40 2.54 3.05 3.56 4.32

3.0 0.51 0.76 1.40 2.16 2.79 3.81 4.32 5.08

4.0 0.76 1.14 1.91 3.05 3.56 4.57 5.08 6.60

0.3 0.05 0.18 0.51 0.89 1.40 2.41 3.30 3.81

0.65 0.18 0.25 0.76 1.14 1.52 3.05 3.56 4.32

2.5

1.5 0.38 0.51 1.02 1.52 1.91 3.56 4.32 5.08

3.0 0.51 0.89 1.52 2.29 3.05 4.32 5.08 6.60

4.0 0.89 1.27 2.03 3.05 3.81 5.08 6.60 7.11

0.3 0.05 0.20 0.51 1.02 1.52 2.54 3.56 4.06

0.65 0.20 0.38 0.64 1.14 1.65 3.05 3.81 4.32

3.0

1.5 0.51 0.64 0.89 1.65 3.05 3.81 4.57 5.08

3.0 0.76 1.52 1.52 3.05 3.81 4.06 6.10 6.10

4.0 1.02 2.03 2.54 4.06 4.57 5.08 7.11 7.62

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