Is there any procedure for SIL & HAZOP (hazardous Operability) Study in gas industry?

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Edwin van Leeuwen

perhaps

“A Guide to Hazard and Operability Studies”, first edition, 1977, published by Chemical Industry Safety and Health Council of the Chemical Industries Association"

will help?

Iain McGuffog

As a first step, refer to the relevant international standards:

IEC 61882 Hazard and operability studies (HAZOP studies) - Application guide

IEC 61511 Functional safety - Safety instrumented systems for the process industry sector