As companies gain experience implementing the ISA 84.01 and IEC 61511 standards, several have gotten toward the end of the safety life cycle with real projects. The final phase of the s..
As companies gain experience implementing the ISA
84.01 and IEC 61511 standards, several have gotten toward the
end of the safety life cycle with real projects. The final
phase of the safety life cycle is called operation and
maintenance. You may think, what operation? Often there is
little operator interaction with the safety instrumented
system (SIS). Remember that an SIS will take action (be
dynamic) only when a dangerous condition exists. We certainly
do not expect that very often. Given this situation, where
the SIS just statically sits there doing nothing for perhaps
years, how does one know if it will even work when
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