October 2002

Columns

HP Automation Safety: Getting failure rate data

During a course this month, I heard from several that the lack of failure rate data for instrumentation used in safety applications has been the major impediment keeping control enginee..

Goble, W., exida LLC

During a course this month, I heard from several that the lack of failure rate data for instrumentation used in safety applications has been the major impediment keeping control engineers from using the safety life cycle approach from ISA 84.01 and the new IEC 61511. These new standards advocate a risk-based approach to safety system design where simple nonredundant designs are for low-risk hazards and more complex redundant designs are used when the process risk justifies the extra expense. When process hazards are identified, order of magnitude risk-reduction targets called safety integrity levels are assigned for each

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