Begin with purpose, not age alone

Calendar age is one part of an asset's history, not a complete condition measure. Duty, environment, maintenance and modifications can change the inspection question. Define whether the baseline will support maintenance prioritisation, a condition review or planning for further engineering assessment.

A condition assessment can combine visual observations, targeted NDT and engineering judgement within an agreed scope. It should distinguish what is known about the asset from what is inferred. An old asset does not automatically need replacement, and a tidy appearance does not establish remaining life.

Reconcile identity and incomplete history

Collect asset numbers, drawings, material information, service records and earlier reports. Check whether these describe the current configuration. Record component replacements and modifications so the baseline is not attached to a superseded design or an unrelated machine.

Where records are missing, document the gap rather than creating a fictional history. A measured survey may recover dimensions, but it cannot necessarily recover material properties or original design intent. Agree what can be established by inspection and what requires separate investigation.

Make the baseline spatially useful

Map observations to members, assemblies or measurement locations that another team can find. Use overview and detail photographs, stable datums and a consistent component register. Condition categories, if used, need definitions and an explanation of how evidence supports them.

Separate observed corrosion, wear, distortion or suspected cracking from conclusions about significance. Include normal-looking examined areas where that helps define coverage, and record concealed or inaccessible locations. An evidence baseline needs the boundary of examination, not just a gallery of defects.

Target NDT to unresolved questions

Select testing from the expected damage, material, geometry and access. Thickness measurements may help characterise wall loss; surface or ultrasonic techniques may help investigate selected indications. Avoid a routine list of methods that adds results without answering a decision-relevant question.

Measurement uncertainty and coverage limits should accompany the baseline. A sparse survey cannot show the absence of local damage everywhere. If the available access cannot support the intended assessment, state the gap and identify what additional preparation or examination would be needed.

Use the baseline without overstating it

Provide a findings register with evidence references, priorities where assessed, and outstanding review needs. Maintenance observations, engineering recommendations and capital-planning assumptions should remain distinct. A condition grade alone may hide why one component needs a different response from another.

Preserve the baseline and update it with dated changes rather than replacing previous evidence. Future comparison should account for repairs, changed use and different examination conditions. Any remaining-life or capacity judgement needs its own appropriate basis; a baseline is a starting point for that review, not an automatic extension of service life.