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

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2.B-66 API RECOMMENDED PRACTICE 581

Table 2.B.8.3M—Amine Corrosion Estimated Corrosion Rate of Carbon Steel in MDEA (≤50 wt%) (mm/y)

Acid

Gas

Loading

(mol/mol)

HSAS

(wt%)

Temperature (°C)

88 93 104 116 127 132

Velocity (m/s)

≤6.1 >6.1 ≤6.1 >6.1 ≤6.1 >6.1 ≤6.1 >6.1 ≤6.1 >6.1 ≤6.1 >6.1

0.5 0.03 0.08 0.03 0.08 0.08 0.25 0.13 0.38 0.25 0.64 0.38 1.02

<0.1

2.25 0.05 0.15 0.05 0.15 0.15 0.51 0.38 1.02 0.51 1.14 0.76 2.03

4.0 0.13 0.25 0.13 0.38 0.38 1.02 0.76 1.52 1.02 2.29 1.52 3.05

Velocity (m/s)

≤1.5 >1.5 ≤1.5 >1.5 ≤1.5 >1.5 ≤1.5 >1.5 ≤1.5 >1.5 ≤1.5 >1.5

0.5 0.03 0.08 0.05 0.15 0.13 0.38 0.25 0.76 0.38 1.14 0.51 1.52

0.15

2.25 0.05 0.15 0.1 0.3 0.25 0.76 0.51 1.52 0.76 2.29 1.02 2.03

4.0 0.13 0.38 0.2 0.64 0.51 1.52 1.02 2.03 1.52 3.05 3.05 3.81

0.5 0.05 0.15 0.08 0.23 0.18 0.51 0.25 0.76 0.51 1.52 0.64 1.91

0.25

2.25 0.1 0.25 0.15 0.51 0.38 1.02 0.51 1.27 1.02 2.03 1.27 2.54

4.0 0.2 0.64 0.38 1.14 0.76 1.52 1.02 2.03 2.03 3.05 2.54 3.81

0.5 0.05 0.15 0.1 0.25 0.18 0.51 0.38 1.02 0.64 1.78 0.76 2.03

0.35

2.25 0.1 0.25 0.2 0.64 0.38 1.14 0.76 1.52 1.27 2.54 2.54 3.81

4.0 0.2 0.64 0.38 1.02 0.89 1.78 1.52 2.54 2.54 3.56 3.81 4.57

0.5 0.08 0.23 0.13 0.38 0.25 0.76 0.38 1.14 0.89 1.78 1.14 2.54

0.45

2.25 0.15 0.38 0.25 0.76 0.51 1.52 1.14 2.29 1.78 3.3 2.29 3.81

4.0 0.25 0.76 0.51 1.02 1.02 2.03 2.29 3.05 3.05 3.81 3.81 4.57

0.5 0.08 0.23 0.18 0.51 0.25 0.76 0.64 1.91 1.02 2.54 1.27 3.05

0.55

2.25 0.15 0.51 0.38 1.14 0.51 1.52 1.27 2.54 2.03 3.56 2.54 3.81

4.0 0.25 0.76 0.76 1.52 1.14 2.29 2.54 3.81 3.56 4.57 4.06 5.08

0.5 0.1 0.25 0.23 0.76 0.38 1.02 0.76 2.54 1.27 3.05 1.52 3.81

0.65

2.25 0.2 0.38 0.51 1.02 0.76 1.52 1.52 2.54 2.29 3.56 2.54 3.81

4.0 0.38 0.89 1.02 2.03 1.52 2.54 2.54 3.81 3.56 4.57 4.06 5.08

0.5 0.13 0.38 0.25 0.76 0.51 1.52 1.02 2.54 1.52 3.05 1.78 3.81

0.7

2.25 0.25 0.76 0.51 1.52 1.02 2.03 1.78 3.05 2.54 3.81 3.05 3.81

4.0 0.51 1.14 1.02 2.03 1.52 2.54 2.54 3.81 3.81 4.57 4.32 5.59

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