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Introduction
A major aspect to comply with ANSI/ISA-S84.01 standard
"Application of Safety Instrumented Systems for the
Process Industries" and the related international
standard IEC 61508, is the establishment of Safety
Integrity Level (SIL) performance requirements for
individual safety instruments systems (SISs). An SIL
(level 1, 2, or 3) is a metric of the reliability of an
SIS, reflecting the probability that it will meet its
design intent on demand.
The ISA, International Electro technical Commission (IEC)
and the American Institute of Chemical Engineers’ (AIChE)
Center for Chemical Process Safety (CCPS) have all
developed guidelines for the selection, design,
installation and maintenance of such Safety Instrumented
Systems. The efforts of these organizations have been
extensive and the results of their work are now
well-documented and serve as excellent resources for the
refining, pulp and paper and petrochemical industries.
The tools typically used to support SIL determination
are classical reliability/risk tools, such as fault tree
analysis, reliability block diagram analysis, Markov
analysis, and simplified, newer methods such as Layer of
Protection Analysis (LOPA).
Our Services
We can help you to modify the existing PSM
programs to address SIS and establish SIS Safety
Requirements Specifications We can also facilitate the
performance of LOPA studies by a team of facility
personnel to help determine what safety integrity levels
(SIL) are needed for SIS.
The following services are offered.
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Design and
detailed engineering for SIS
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Teaching
SIS design and implementation courses to industry
personnel
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Documentation of existing SIS for PSM requirements
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Evaluations
and/or selection assistance for new or existing SIS
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Maintenance
procedures and software for SIS to meet Safety
Integrity Levels and for PSM mechanical integrity
requirements
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