Inspection and Integrity Management
From inspection planning to data management — how integrity programs are structured and what data drives lifecycle decisions.
What is Integrity Management?
Asset integrity management (AIM) is the systematic process of ensuring that physical assets — pressure vessels, piping, tanks, structures, rotating equipment — continue to perform their required function safely and reliably throughout their operational life.
A comprehensive integrity management system encompasses: hazard identification, risk assessment, inspection planning, data management, anomaly assessment, fitness-for-service evaluation, and maintenance strategy. It is the engineering backbone of safe, reliable plant operation.
Inspection Techniques — Matching Method to Mechanism
The effectiveness of an inspection depends on selecting the right technique for the active degradation mechanism:
Ultrasonic Testing (UT): Wall thickness measurement for corrosion monitoring. Conventional UT for point measurements; Long Range UT (LRUT) for screening large lengths of pipework without insulation removal.
Phased Array UT (PAUT): High-resolution weld inspection, crack detection and sizing. Higher productivity than conventional UT with digital data recording.
Radiographic Testing (RT): Weld quality, internal inspection of complex geometry, erosion mapping in process pipework elbows and tees.
Magnetic Particle Inspection (MPI/MFI): Surface-breaking crack detection in ferromagnetic materials. High sensitivity for cracks but surface-only.
Acoustic Emission (AE): Detection of active crack growth under operational load. Allows monitoring of large structures while in service.
Drone/Remote Visual Inspection: Accessing locations without scaffolding — flare stacks, storage tanks, structural members.
Inspection Data Management
The value of inspection lies not just in what is found, but in how the data is managed and applied over time. Inspection data management systems (IDMS) store, trend, and report on all inspection findings, enabling:
- Corrosion rate calculation: Current thickness vs. previous thickness ÷ time elapsed
- Remaining life calculation: Current thickness vs. minimum allowable ÷ corrosion rate
- Inspection effectiveness assessment: Has the inspection technique adequately characterized the threat?
- RBI integration: Updated PoF calculations based on latest findings
- FFS input: Dimensional data for crack and corrosion assessment
Data quality is the critical issue. Inconsistent measurement locations, different UT equipment calibrations, and poor documentation undermine the ability to calculate meaningful corrosion rates.
Key Takeaways
Inspection must be planned against specific degradation mechanisms — not just location and schedule
Match the inspection technique to the active threat for meaningful data
Inspection data only adds value when managed in a system that enables trending and RUL calculation
Inspection effectiveness — the ability to detect the expected damage type — must be assessed when planning inspection scope
A live, maintained inspection database is the foundation of any credible asset integrity program
Apply this knowledge to your assets
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