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

RISK-BASED INSPECTION METHODOLOGY, PART 2, ANNEX 2.B—DETERMINATION OF CORROSION RATES 2.B-63
Table 2.B.8.2—Amine Corrosion Estimated Rate of Carbon Steel in MEA (≤20 wt%)
and DEA (≤30 wt %) (mpy)
Acid
Gas
Loading
(mol/mol)
HSAS
(wt%)
Temperature ( °F)
190 200 220 240 260 270
Velocity (ft/s)
≤20 >20 ≤20 >20 ≤20 >20 ≤20 >20 ≤20 >20 ≤20 >20
2 1 3 1 3 3 10 5 15 10 25 15 40
<0.1
3.0 2 6 2 6 6 20 15 40 20 45 30 80
4.0 5 10 5 15 15 40 30 60 40 90 60 120
Velocity (ft/s)
≤5 >5 ≤5 >5 ≤5 >5 ≤5 >5 ≤5 >5 ≤5 >5
2 1 3 2 6 5 15 10 30 15 45 20 60
0.15
3.0 2 6 4 12 10 30 20 60 30 90 40 80
4.0 5 15 8 25 20 60 40 80 60 120 120 150
2 2 6 3 9 7 20 10 30 20 60 25 75
0.25
3.0 4 10 6 20 15 40 20 50 40 80 50 100
4.0 8 25 15 45 30 60 40 80 80 120 100 150
2 2 6 4 10 7 20 15 40 25 70 30 80
0.35
3.0 4 10 8 25 15 45 30 60 50 100 100 150
4.0 8 25 15 40 35 70 60 100 100 140 150 180
2 3 9 5 15 10 30 15 45 35 70 45 100
0.45
3.0 6 15 10 30 20 60 45 90 70 130 90 150
4.0 10 30 20 40 40 80 90 120 120 150 150 180
2 3 9 7 20 10 30 25 75 40 100 50 120
0.55
3.0 6 20 15 45 20 60 50 100 80 140 100 150
4.0 10 30 30 60 45 90 100 150 140 180 160 200
2 4 10 9 30 15 40 30 100 50 120 60 150
0.65
3.0 8 15 20 40 30 60 60 100 90 140 100 150
4.0 15 35 40 80 60 100 100 150 140 180 160 200
2 5 15 10 30 20 60 40 100 60 120 70 150
0.7
3.0 10 30 20 60 40 80 70 120 100 150 120 150
4.0 20 45 40 80 60 100 100 150 150 180 170 220