Title: Effects of proof tests on the safety performance of safety-instrumented systems

Authors: Noureddine Asklou; Rachid Noureddine

Addresses: University of Oran 2 Mohamed Ben Ahmed, Institute of Maintenance and Industrial Safety, Oran, Algeria ' University of Oran 2 Mohamed Ben Ahmed, Institute of Maintenance and Industrial Safety, Oran, Algeria

Abstract: The imperfection in the values of the average probability of failure on demand (PFD_avg) creates uncertainty about the effectiveness of safety-instrumented system (SIS). To overcome this problem, many parameters such as dangerous failures, common cause failures, diagnostic coverage rate and proof tests are taken into consideration. In order to emphasise the importance of the proof tests and show their effects on the safety performance of the SIS, a new analytical formula is developed in this study. The impact of these tests on the SIS's allocation of the safe integrity level (SIL) is shown through the results obtained in the present research.

Keywords: safety-instrumented system; proof test; average probability of failure on demand; PFD_avg; safety integrity level; SIL.

DOI: 10.1504/IJISE.2020.105740

International Journal of Industrial and Systems Engineering, 2020 Vol.34 No.3, pp.396 - 408

Received: 29 Jan 2018
Accepted: 10 Jul 2018
Published online: 11 Mar 2020 *

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