Three levels of risk based inspection have been developed by the API sponsor group.
Level 1: Qualitative RBI which utilizes a step-by-step workbook to rank entire process units or process systems into a 5 x 5 risk matrix.
Level 2: Semi-quantitative RBI which is a simplified method of quantitative RBI (Level III) for risk ranking individual pieces of equipment in a process unit. Level II also uses a 5 x 5 risk matrix for displaying risk analysis results.
Level 3: Quantitative RBI which is a more detailed (and more accurate) method of risk ranking individual pieces of equipment in a process unit. Level III calculates a specific consequence score, a specific likelihood of failure score and a specific risk score for each piece of equipment in a process unit.
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