Abstract
In this paper have been considered the basic terms of functional safety for industrial processes according to GOST R IEC61511–1–2011 «Functional Safety. Safety Instrument Systems for Industrial Processes»: safe and dangerous failures, safety instrumented system, safety instrument function, safety integrity level. The qualitative analysis method — the study of hazard and operability HAZOP using the control words — has been considered. The algorithm for HAZOP carrying out has been presented. Safety integrity levels for low and high intensity of requests have been considered. An example for safety integrity level determination has been depicted.
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