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

2-94 API RECOMMENDED PRACTICE 581
14.10 Figures
Cracks
present?
Yes
High Susceptibility
Cracks
Removed?
STEP 1: Determine the
susceptibility for cracking
No
HF present?
No
Not Susceptible
Yes
No
FFS
Yes
Carbon steel?
No
Not Susceptible
Product
Form
PWHT?
Yes
Determine the
Susceptibility Using
Table 14.2.
STEP 2: Determine the severity index from
Table 14.3.
STEP 3: Determine the time in-service,
age, since the last inspection.
STEP 4: Determine the number of inspections
and the corresponding inspection
effectiveness category for all past inspections
Table 2.C.9.9.
STEP 5: Determine the base damage factor
for HIC/SOHIC-HF cracking using Table 6.3.
STEP 6: Calculate the escalation in the
damage factor using Equation (2.33).
Figure 14.1—Determination of the HIC/SOHIC-HF Cracking DF