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

2-42 API RECOMMENDED PRACTICE 581
Table 5.6—Lining Condition Adjustment
Qualitative
Condition
Poor
Average
Good
Description
The lining has either had previous failures or exhibits conditions
that may lead to failure in the near future. Repairs to previous
failures are not successful or are of poor quality.
The lining is not showing signs of excessive attack by any
damage mechanisms. Local repairs may have been performed,
but they are of good quality and have successfully corrected the
lining condition.
The lining is in “like new” condition with no signs of attack by
any damage mechanisms. There has been no need for any
repairs to the lining.
Adjustment Multiplier—F LC
10
2
1
5.8 Figures
STEP 1: Determine the lining type and
time in-service, age, of the lining.
Lining Type
Years Since
Inspection
(reference Table
2.C.6.1)
STEP 2: Determine the base value of the lining
damage factor, using Tables 5.4 and 5.5.
For Organic
Coatings, Years
in Service
STEP 3:
Determine adjustment factors:
• Lining Condition
• On-Line Monitoring
Determine the damage
factor for lining using
Equation (2.24).
Figure 5.1—Determination of the Lining DF