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

2.B-50 API RECOMMENDED PRACTICE 581
Table 2.B.5.4—H 2 SO 4 Corrosion—Estimated Corrosion Rates for Type 316 SS (mpy)
Acid
Concentration
(wt%)
2
ft/s
316 SS Corrosion Rate (mpy)
86 °F 104.5 °F 140.5 °F
6 7 2 6 7 2 6
ft/s ft/s ft/s ft/s ft/s ft/s ft/s
7
ft/s
98 5 10 15 15 30 45 100 200 300
92.5 10 20 30 30 60 90 400 800 999
87 20 40 60 50 100 150 800 999 999
82 50 100 150 400 800 999 999 999 999
75 300 600 900 999 999 999 999 999 999
65 600 999 999 999 999 999 999 999 999
50 900 999 999 999 999 999 999 999 999
30 200 400 600 999 999 999 999 999 999
15 30 60 90 60 120 180 200 400 600
8 10 20 30 30 60 90 80 160 240
3.5 5 10 15 20 40 60 40 80 120
2 5 10 15 5 10 15 10 20 30