Fuzzy approach for safety integrity level evaluation to improve the safety of an industrial fred heater
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Date
2023-08-22
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International Journal of Systems Assurance - Engineering and Management
Abstract
ct The study proposes an integrated frame imple mented based on HAZOP and fuzzy evaluation of risk
matrix (used to evaluate the safety integrity level), the aim
is the improvement of an industrial fred heater safety. The
determination of target SIL of any safety-instrumented
function by the conventional methods such as Risk graphs,
LOPA…may give imprecise values due uncertainties, in
both parameters and models. Fuzzy theory is a useful math ematical approach to deal with the problem of uncertainties,
by applying the membership principle introduced by L.A
Zadeh. In this paper, we will use the Fuzzy theory to evalu ate the target SIL for HAZOP recommended safety func tions of a fred heater. The results will be compared with
other SIL values (called calculated SIL and deduced using
practical data of Probability of failure under Demand (PFD
values). Depending on these comparison, recommendations
for improvement are raised. In our case and from the overall
study more safety functions should be added and the design
of others have to be modifed to respect the required safety
level