Spurious Trip Rate Modelisation and Quantitative assessment of Emergency ShutDown system in the oil and gaz industry

Abstract

The main purpose of Safety-related implementation systems is to maintain safety condition of a plant or equipment from the hazardous events, but even if no indications of impairment are present, the instrumented safety system is may spuriously trip. These activations are characterized in terms of spurious trip frequency rate and their occurrence can lead to significant technical and economic losses.

The identification of these trips, their causes, their effects and their evaluations have been the subject of several studies. Therefore , this work aims to propose a risk analysis modelling of Spurious Trip (ST) to safety instrumented system (SIS) installed in an industrial installation of Edjelet gas flares recovery project The risk analysis tool, the fault-tree analysis method and the STR estimation according to different approaches are drawn from literature .