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..
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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