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