Inspections are widely used in the process industries to reduce risk related to failure on static mechanical equipment. Risk-based inspection is one of effective tools to optimize inspection and maintenance planning. Based on principle of the risk-based inspection methodology, the main failure modes and damage mechanisms of pressure vessels and pipelines in ethylene compression unit are identified. The risk assessment of pressure vessels and pipelines is carried out. All pressure vessels and pipelines in this unit are prioritized based on the level of risk. Risk mitigation measures and optimal inspection and maintenance strategy are proposed. The results of risk evaluation have highlighted a clear improvement in the quality of inspection and maintenance of the ethylene compression unit.

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