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

2.B-6 API RECOMMENDED PRACTICE 581
Table 2.B.2.3—HCl Corrosion—Estimated Corrosion Rates for Carbon Steel (mpy)
pH
Temperature (°F)
100 125 175 200
0.5 999 999 999 999
0.80 900 999 999 999
1.25 400 999 999 999
1.75 200 700 999 999
2.25 100 300 400 560
2.75 60 130 200 280
3.25 40 70 100 140
3.75 30 50 90 125
4.25 20 40 70 100
4.75 10 30 50 70
5.25 7 20 30 40
5.75 4 15 20 30
6.25 3 10 15 20
6.80 2 5 7 10
Table 2.B.2.3M—HCl Corrosion—Estimated Corrosion Rates for Carbon Steel (mm/y)
pH
Temperature (°C)
38 52 79 93
0.5 25.37 25.37 25.37 25.37
0.80 22.86 25.37 25.37 25.37
1.25 10.16 25.37 25.37 25.37
1.75 5.08 17.78 25.37 25.37
2.25 2.54 7.62 10.16 14.22
2.75 1.52 3.30 5.08 7.11
3.25 1.02 1.78 2.54 3.56
3.75 0.76 1.27 2.29 3.18
4.25 0.51 1.02 1.78 2.54
4.75 0.25 0.76 1.27 1.78
5.25 0.18 0.51 0.76 1.02
5.75 0.10 0.38 0.51 0.76
6.25 0.08 0.25 0.38 0.51
6.80 0.05 0.13 0.18 0.25