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

2.B-30 API RECOMMENDED PRACTICE 581
Table 2.B.3.10—High Temperature Sulfidic and Naphthenic Acid Corrosion—Estimated Corrosion
Rates for 316 SS with ≥ 2.5 % Mo and 317 SS (mpy)
Sulfur
(wt%)
TAN
(mg/g)
Temperature (°F)
≤450 500 550 600 650 700 750 >750
4.0 1 1 1 1 1 1 1 1
0.2
5.0 1 1 1 1 1 2 4 5
6.0 1 1 1 2 4 5 7 10
4.0 1 1 1 1 1 1 1 1
0.4
5.0 1 1 1 1 2 4 4 5
6.0 1 1 2 3 4 5 7 10
4.0 1 1 1 1 1 1 1 1
0.8
5.0 1 1 1 1 2 4 4 5
6.0 1 1 2 3 4 5 7 10
4.0 1 1 1 1 1 1 1 1
1.5
5.0 1 1 1 1 2 3 5 7
6.0 1 1 3 5 5 5 7 10
4.0 1 1 1 1 1 1 1 1
2.5
5.0 1 1 1 2 3 4 5 7
6.0 1 1 3 5 5 6 8 10
4.0 1 1 1 1 1 1 1 2
3.0
5.0 1 1 1 2 3 4 5 7
6.0 1 2 3 5 5 6 8 10