Probability of Failure (PoF) is the measure of the likelihood that includes a confidence levelling with regard to the damage rates and mechanisms, and the effectiveness of the inspection program. A PoF is estimated both qualitatively and quantitatively as failure frequencies of different types of mechanisms in the operating system. In Risk Based Inspection (RBI) analysis, a PoF exampled failure frequencies of an event per unit as ranking categories from 1 (very low) to 5 (very high). (Refer to the Consequence of Failure (CoF))
Reference Definition by Inspectioneering.com: Probability of Failure (POF) is likelihood that a piece of equipment will fail at a given time and an important part of effective risk analyses. The POF is half of the equation when determining risk as part of Risk Based Inspection (RBI) methodology. The POF, calculated together with the Consequence of Failure (COF), helps operators establish the risk level for a particular piece of equipment and set inspection intervals based on the calculated risk. POF is calculated for individual pieces of equipment by looking at the potential damage mechanisms it could be susceptible to, a general frequency of failures, and management system factors. More details on POF are provided in the American Petroleum Institute’s Recommended Practice 580: Risk Based Inspection (RBI), which contains directions on developing, implementing and maintaining an effective RBI program.
Related Definitions in the Project: The Project Management; Risk Management; Quality Managemen; Operation and Maintenance
