What Happens During a Pressure Vessel Inspection?
A useful inspection does more than record visible defects. It connects the identity and operating history of a vessel with evidence about its condition, then explains what the owner needs to do next. The scope should be agreed before the visit, not inferred from the final report.
Start with the question the inspection must answer
An in-service condition review, a commissioning inspection and an investigation after an operating upset have different objectives. Tell the inspector why the work is needed, whether the vessel can be shut down and what decision depends on the result. A previous report is useful, but its scope is not automatically the right scope today.
Equipment identity, contents, operating pressure and temperature, duty changes and known damage mechanisms help define the examination. Missing design information or uncertain identity should be recorded as a limitation rather than filled in by assumption.
Use pressure vessel inspections to define the examination, reporting and follow-up evidence your decision requires.
Follow the evidence in the field
The inspector checks the asset against the agreed scope and available records. External examination may include accessible pressure boundaries, supports, connections and signs of leakage or deterioration. Internal examination depends on safe access and the equipment-specific plan. Targeted NDT may be needed where visual evidence cannot resolve the condition question.
The site remains responsible for agreed access and operational controls. An inspector finding an inaccessible area should identify the gap; a report should not imply that hidden surfaces were examined. Photographs, location references and measurements make findings usable by the next person reviewing the asset.
Read the findings as decisions, not just observations
A report should distinguish what was observed, how it was examined, what could not be examined and what follow-up is needed. A thickness measurement is evidence, not by itself a declaration that the vessel is suitable for every operating condition.
Some findings need engineering assessment, additional examination or rectification before a return-to-service decision can be made. Ask who owns each action and which findings require prompt escalation. Do not treat receipt of a report as closure of unresolved conditions.
- Confirm the asset tag and serial number match the equipment.
- Check scope, examination dates, locations and access limitations.
- Assign owners for recommendations, engineering queries and repairs.
- File the final report with the register and supporting test records.
Close the loop with the asset record
Once decisions are made, retain the evidence supporting them alongside the inspection report. This may include engineering dispositions, repair verification and revised operating controls. Future inspection planning should use that history and the applicable technical and jurisdictional basis, not a blanket interval copied from another vessel.