by Phillip E. Prueter, P.E. / Aug 01, 2016

Post weld heat treatment (PWHT) is an effective way to minimize weld residual stresses in pressure vessels and piping equipment. Local PWHT methodologies provided in ASME B&PV Code Section VIII Divisions 1 and 2, ASME Section III Subsection NB, British Standard 5500, Australian Standard 1210, API 510, and NBIC are discussed and compared in this article.

This article also investigates several case studies of local PWHT configurations where advanced, three-dimensional FEA is used to simulate the thermal-mechanical response of the repaired region on a pressure vessel and to optimize the most ideal PWHT arrangement.

Commentary on the ASME and NBIC specified local PWHT requirements is rendered based on the detailed non-linear FEA results, and recommended good practice for typical local PWHT configurations is provided.

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