API 581 Risk-based Inspection Methodology
Purpose
This recommended practice* API RP 581* Risk-Based Inspection Methodology* provides quantitative procedures
to establish an inspection program using risk-based methods for pressurized fixed equipment including pressure
vessel* piping* tankage* pressure relief devices (PRDs)* and heat exchanger tube bundles. API RP 580 Risk-
Based Inspection [1] provides guidance for developing Risk-Based Inspection (RBI) programs on fixed
equipment in refining* petrochemical* chemical process plants and oil and gas production facilities. The intent is
for API RP 580 to introduce the principles and present minimum general guidelines for RBI while this
recommended practice provides quantitative calculation methods to determine an inspection plan.

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