Which document is essential for guidance on conducting RBI assessments?

The essential document for guidance on conducting Risk-Based Inspections (RBI) assessments is API 580. This document specifically outlines the principles of risk-based inspection, methods for assessing risk, and how to apply these assessments effectively in the maintenance and inspection of pressure vessels and piping systems.

API 580 provides the framework necessary for organizations to implement RBI methodologies that help prioritize inspection efforts based on the risk of failure and the potential consequences of such failures. This is crucial in ensuring safety, compliance, and efficient resource allocation in managing inspection activities.

The other documents mentioned, while relevant to various aspects of pressure vessel and piping system inspection and maintenance, do not focus specifically on RBI assessments. API 510 predominantly addresses the inspection, repair, alteration, and rerating of pressure vessels, API 570 pertains to the inspection of piping systems, and API 650 covers the design and construction of tanks for oil storage, with no direct emphasis on risk-based methodologies.