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

RISK-BASED INSPECTION METHODOLOGY, PART 2—PROBABILITY OF FAILURE METHODOLOGY 2-93
Table 14.3—Determination of Severity Index—HIC/SOHIC-HF
Susceptibility
Severity Index—S VI
High 100
Medium 10
Low 1
None 0
Table 14.4—On-line Monitoring Adjustment Factors for HIC/SOHIC-HF
On-line Monitoring Method
Adjustment Factors as a Function of
On-line Monitoring—F OM
Key process variables 2
Hydrogen probes 2
Key process variables and hydrogen probes 4
NOTE The adjustment factors shown above are estimates providing a measure of the relative
effectiveness of various on-line monitoring methods. Factors based on the user’s experience can be used
as a substitute for the values presented in this table.