抄録
The recommended practice, API RP 581, “Risk-based Inspection Methodology” was revised and published at January 2025 for fourth edition. The RBM (Risk-Based Maintenance)/RBI standard has been widely applied as a reasonable management system of maintenance and inspection planning for various facility or equipment.
In this explanation, documents for the fourth edition are compared with the third edition published in 2016. Though basic concept of risk calculation and analysis is not changed, updates to thinning and cracking modules are focused for damage factor determination. Improvement of inspection planning methodology, handling of clad/weld overlay, coating and others are concentrated. At the same time, document composition as standard was maintained understandably.
