This paper explains the benefits of API Risk-Based Inspection (RBI) over traditional methods of determining inspection schedules for pressure relieving devices (PRDs). The API “Base Resource Document on RBI” (API 581) details an accepted RBI methodology for pressure relieving devices. This methodology can be used to set risk-based inspection intervals for PRDs. Using risk to establish inspection schedules provides a number of benefits over traditional time-based inspection scheduling, including significant reduction of risk and optimization of costs incurred by inspections.

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