Final answer:
The question is about an inspection performed on a pressure vessel from the outside to determine its suitability for continued service. The correct answer is On-stream Inspection, which involves using non-destructive evaluation procedures to examine the pressure boundary while the vessel is in service.
Step-by-step explanation:
The subject of this question falls under Engineering. The question is asking about an inspection performed on a pressure vessel from the outside to determine its suitability for continued service.
The correct answer is c. On-stream Inspection. On-stream inspection involves using non-destructive evaluation (NDE) procedures to examine the pressure boundary of a vessel while it is in service. This allows for continuous monitoring and assessment of its condition without interrupting its operation.