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Disclaimer:
The content in this paper is loosely based on experiences, and have been embellished to bring out the salient points
against the objectives of this paper.
The “supply chain” is the parties involved in delivering and not just supplying safety systems. That is; the
customer, the design house, the equipment manufacturer, the installer, the commissioner, the
operator.
IEC 61511 Part 1 Clause 4 “Conformance to this International Standard” states;
“
To conform to this International Standard, it shall be shown that each of the requirements outlined in
Clauses 5 through 19 has been satisfied to the defined criteria and therefore the clause objective(s) has
(have) been met.”
Figure 1 (copy of
IEC-61511 Figure 8
– SIS safety life-cycle phases and functional safety assessment
stages)
shows the Safety Instrument System (SIS) safety life-cycle phases and functional safety
assessment stages, which highlight the connectivity of the various parts in the process.
Figure 1: SIS safety life-cycle phases and functional safety assessment stages