Development of an effective inspection plan for pressure vessels according risk-based inspection technology for polyethylene plant

Abstract

In order to ensure the asset integrity, all unfired pressure vessels (UPVs) should be examined at the intervals recommended in inspection codes or risk-based inspection (RBI) assessment. RBI assessment may allow previous inspection intervals to be extended and the inspection method may be reselected. In this paper, RBI study performed on 114 unfired pressure vessels components for Unipol Polyethylene Plant. Risk assessment performed and determines the risk ranking. Inspection plan developed base on the risk assessment result. The risk-based inspection plan compared with conventional inspection plan i.e. API 510’s inspection intervals. This thesis will summarize the fundamental steps for API 580 Risk-Based Inspection methodology, i.e. the risk calculation and assessment, evaluated the damage mechanism via the corrosion loops, and the inspection technologies.