A field-focused look at how advanced simulation turns inspection data into defensible fitness-for-service decisions.

From inspection findings to operating decisions

A Level 3 fitness-for-service assessment goes beyond screening calculations. It builds a defensible model of how equipment behaves under its real geometry, material condition, loads, and operating history.

API 579-1/ASME FFS-1 provides the framework. Advanced simulation supplies the resolution needed when damage, geometry, or loading cannot be represented reliably by simpler methods.

The objective is a clearer decision: continue operating, repair, rerate, monitor, or replace.

Three completed applications

Distillation-column vapour system: assessment of the critical operating envelope and localized stress response.

Diesel storage tank: evaluation of observed degradation against safe continued-service limits.

Fired heater for a distillation column: advanced thermal and structural assessment of equipment condition.

What a strong Level 3 study delivers

The final result should connect assumptions, inspection inputs, model validation, acceptance criteria, and recommended actions in one traceable engineering argument. That is what turns simulation into an integrity decision.

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