This paper describes a risk-based approach for corrosion management of offshore floating structures. The objective of this approach is to reduce the risk of corrosion related failures, reduce the associated downtime, while improving the cost-effectiveness of corrosion inspection and maintenance.

Corrosion is increasingly a significant challenge to the offshore industry and attributed to: an aging worldwide offshore fleet; assets being kept in operation for prolonged periods of time; units operating beyond their original “design basis”; and newer larger vessels in deeper, harsher environments with less opportunity for ship yard repair. Corrosion is particularly detrimental to the integrity of the unit, and if not managed properly will increase maintenance costs and downtime costs, possibly reducing the useful operational life of the unit. Although, there are several existing offshore corrosion design standards, experience still reveals a number of assets in poor and critical condition due to corrosion.

Clearly there is a need for a holistic approach on corrosion management during the full operational life of the asset. The presented methodology is based on the principles of ISO 31000 (Risk Management - Principles and Guidelines) to provide a solid consistent framework for corrosion management. The risk-based corrosion management process for offshore structures described in this paper consists of five (5) basic steps: Pre Assessment; Screening and Risk Ranking; Detailed Examination; Remediation and Repair; and Life Cycle Management.

Adopting the described risk based corrosion methodology will provide confidence to the operators and demonstrable evidence to key stakeholders that corrosion is being managed on their assets. It will account for life extension, reduce the risk of corrosion failure, and lower the cost of inspection and maintenance.

Paper published with permission.

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