Who must conduct inspection after major modification of a pressure vessel?

• A. Plant Manager
• B. Operator
• C. QA Analyst
• D. Authorized Inspector

Answer: (D)

Major modifications to a stamped pressure vessel can change how it carries load, materials, welding, and overall safety margins, so a formal code-based review is required. An Authorized Inspector is the designated, independent person who verifies that the changes meet the ASME Boiler and Pressure Vessel Code requirements, witnesses tests, checks documentation, and determines whether the vessel can be re-stamped and placed back into service. This inspector has the authority to certify code compliance, something that internal roles like plant management, operators, or QA staff do not have. Their involvement ensures the modification adheres to safety standards and that the vessel remains properly certified for operation.