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[MW:23262] Re: Welding P91 without PWHT

By Materials & Welding
Please see response from George Galanes confirming my previous input. I have quoted verbatim, "The NBIC can apply to any pressure retaining item. However, the real issue is regulation and enforcement.

Most, if not all Jurisdictions, across the US only regulate boilers and/or pressure vessels, and not pressure piping specifically.  If the end user decides to use Part 3 NBIC for pressure piping it is their discretion but there is no legal enforcement, like for Boiler and Pressure Vessels. Look at the synopsis map below from the National Board, and you will see ASME Section I (Boiler), ASME Section VIII (Pressure Vessel) only.

http://www.nationalboard.org/SiteDocuments/Synopsis/2015_map.pdf"

Please also note that in my previous response I may have quoted the wrong EPRI report number. It should be 3002003833 NOT 3002003822. Best regards to all

John S

On Saturday, May 9, 2015 at 12:23:28 AM UTC-4, José Luís Ferreira wrote:
Is there an alternative to weld P91 to P91 (Cr-Mo-V) without performing PWHT? I need to weld (repair) small valves (socket welds) in field.

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