Which organization governs repairs and alterations of pressure vessels after service?

• A. Occupational Safety and Health Administration
• B. National Board Inspection Code (NBIC)
• C. ASME Boiler and Pressure Vessel Code
• D. American Petroleum Institute 650

Answer: (B)

Repairs and alterations on pressure vessels after they’ve been put into service are governed by the National Board Inspection Code. This code sets the requirements for in-service repairs and alterations, including who is qualified to perform them, acceptable repair methods and welding procedures, required nondestructive examinations, material qualifications, and the stamping/verification that the work meets the code. It works in parallel with the ASME Boiler and Pressure Vessel Code, which covers original design, fabrication, and installation; NBIC specifically addresses changes made after service to ensure the vessel remains safe. The other options don’t focus on in-service repairs and alterations: OSHA governs broad workplace safety, API 650 covers storage tanks for petroleum, and ASME BPVC alone does not prescribe the in-service repair/alteration framework the NBIC provides.