Prior to inspecting a vessel, what must the inspector understand?

Understanding the purpose of the vessel is crucial for an inspector prior to conducting any evaluations. The purpose provides insight into how the vessel is expected to function within its operational context. For example, knowing whether the vessel is designed for storage, heat exchange, or processing helps the inspector to identify the critical areas that may be subject to specific stresses, corrosion, or other forms of degradation relevant to that intended use. Additionally, different purposes may dictate various regulatory requirements or industry standards that the inspector must consider during the assessment.

While other factors, such as the design pressure, operational history, and location of valves, are also important and contribute to a comprehensive understanding of the vessel's condition and safety, they are secondary to grasping the fundamental purpose. This foundational knowledge ultimately informs the inspection criteria and methodology that the inspector will apply, guiding them in focusing on the most relevant aspects of the vessel's integrity and performance.