![]() All rights reserved 2ģ BACKGROUND INFORMATION While spot PWHT may be appropriate in certain cases, if the soak, heating, and gradient control bands are not properly sized and positioned, it can lead to permanent vessel distortion or detrimental residual stresses. Additionally, Welding Research Council (WRC) Bulletin 452 offers detailed guidance relating to local PWHT and compares Code-based methodologies for implementing local PWHT on pressure retaining equipment E 2 G The Equity Engineering Group, Inc. Both the ASME Boiler and Pressure Vessel (B&PV) Code and the National Board Inspection Code (NBIC) permit the use of local PWHT around nozzles or other pressure boundary repairs or alterations. ![]() Spot or bulls eye configurations are often employed in industry to perform PWHT following local weld repairs to regions of the pressure boundary. Performing local PWHT following component repairs or alterations is often more practical and cost effective than heat treating an entire vessel or a large portion of the pressure boundary. PWHT is required for carbon steels above a Code-defined thickness threshold and other low-alloy steels to mitigate the propensity for crack initiation and ultimately, brittle fracture, and is often employed to mitigate stress corrosion cracking due to environmental conditions. ASME 2016 Pressure Vessels and Piping Conference July 17-21, 2016 Vancouver, British Columbia, Canada 1Ģ INTRODUCTION Post weld heat treatment (PWHT) is an effective way to minimize weld residual stresses in pressure vessels and piping equipment. ![]() Brian Macejko The Equity Engineering Group, Inc. ![]() 1 Establishing Recommended Guidance for Local Post Weld Heat Treatment Configurations Based on Thermal-Mechanical Finite Element Analysis Phillip E. ![]()
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