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RBI (Risk-Based Inspection)

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Definition: Risk-Based Inspection (RBI) is a risk-based methodology for planning and prioritising inspection measures in technical plants. It combines the probability of occurrence of damage with its potential consequences. The international foundations are API 580 (guideline) and API 581 (calculation methodology).

Practical relevance: RBI is used in particular in the process, oil and gas industries. Corrosion mechanisms, material condition, operating parameters and damage consequences are assessed. The result is a risk-based classification from which inspection intervals, testing methods (e.g. UT, RT) and measures are derived. The aim is to optimise safety, availability and maintenance costs.

Decision-making perspectives:

  • Technical decision-makers: Focus on risk-critical components and efficient resource allocation.
  • Purchasing/project management: Economic planning of testing and maintenance budgets.
  • Science: Modelling of failure probabilities and sensitivity analyses.
  • Insurance/law: Demonstration of systematic risk assessment and compliance with technical duties of care.

Typical testing or verification methods: Wall thickness measurement (UT), visual inspection, corrosion monitoring, probabilistic risk analysis.

FAQ:

  • What is the advantage of RBI compared to fixed inspection intervals?
  • Inspection resources are deployed in a risk-oriented manner, thereby increasing safety and reducing unnecessary inspections.
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