Plant:

• A gas treatment plant, in the Middle East, during the final stages of design

Objective:

• To assist the plant constructor to provide the operator with a risk based inspection plan for all plant items subject to corrosion
• The initial plan to be based on design data, but adaptable to reflect actual corrosion experience in-service

Approach:

• Review of existing design data, hazard analyses and corrosion calculations
• Development of a probabilistic model of the expected corrosion processes, under normal and fault conditions
• Development of a risk based inspection plan using the probabilistic corrosion model and the existing semi-quantitative consequence estimates, making allowance for areas of potential full or partial redundancy in the system

Benefits:

• A risk hierarchy for all components in the plant
• A grouping of components according to optimal inspection intervals
• A method for re-setting inspection intervals depending on the relationship between observed in-service corrosion and the a priori estimates