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This Standard provides requirements for heat treatment of piping and pipelines that meet the requirements of the ASME B31 Code Sections. These requirements apply to (a) preheating (b) postweld heat treatment (PWHT) (c) postforming heat treatment (PFHT) required by the ASME B31 Code Sections for other fabricated assemblies, including forming operations such as bending (d) heat treatments required by contract documents
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