Advances in Asset Management Techniques: An Overview of Corrosion Mechanisms and Mitigation Strategies for Oil and Gas Pipelines
Table 4
Corrosion inhibitor risk categories.
Risk category
Max inhibitor availability
Max expected uninhibited corrosion rate (mm/yr)
comments
Proposed category name
1
0%
0.4
Benign Fluid, corrosion inhibitor use not anticipated. Predicted metal loss accommodated by corrosion allowance
Benign
2
50%
0.7
Corrosion inhibitor probably required but with expected corrosion rates there will time be time to review the need for inhibition based on inspection data.
Low
3
90%
3
Corrosion inhibition required for majority of field life but inhibitor facilities need not be available from day one.
Medium
4
95%
6
High reliance on inhibition for operational life time. Inhibitor facilities most be available from day one to ensure success
High
5
>95%
>6
Carbon steel and inhibition is unlikely to provide integrity for full field life. Select corrosion resistant material or plan for repair and replacement
