This document is intended solely for the purpose ofproviding guidance in the evaluation of metal loss in pressurizedpipelines and piping systems. It is applicable to all pipelines andpiping systems that are part of ASME B31 Code for Pressure Piping,i.e., ASME B31.4 Pipeline Transportation Systems for LiquidHydrocarbons and Other Liquids; ASME B31.8, Gas Transmission andDistribution Piping Systems; ASME B31.11, Slurry TransportationPiping Systems; and ASME B31.12, Hydrogen Piping and Pipelines,Part PL.