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

2-82 API RECOMMENDED PRACTICE 581
Table 12.3—Determination of the Susceptibility Modifier for ClSCC
Environmental Variable
Susceptibility Modifier
Cl < 10 ppm –1
Oxygen < 90 ppb –1
Cl > 100 ppm +1
Deposits +1
NOTE ClSCC susceptibility value is determined by adjusting the
base susceptibility with the susceptibility modifiers.
Table 12.4—Determination of Severity Index—ClSCC
Susceptibility
Severity Index—S VI
High 5000
Medium 500
Low 50
None 0