Inspectioneering Journal

Update on API Risk-Based Inspection Project

Part 2

By John Reynolds, Principal Consultant at Intertek. This article appears in the November/December 1996 issue of Inspectioneering Journal.

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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