10-04-2014, 11:32 AM
Safety Integrity Level (SIL) Studies
Safety Integrity Level.pdf (Size: 733.54 KB / Downloads: 421)
Service Description
and Values Generated:
A Safety Integrity Level (SIL) assessment determines the effectiveness
of safety systems based on the probability of tolerable incidents that
can occur within a number of processing demands. With many years
of experience in the management of safety, hazard and risk,
Germanischer Lloyd (GL) are extremely well placed to deliver SIL
assessments. Our understanding of major hazards and their
consequences and the evolvement of tools and methodologies, as our
knowledge has enhanced over the past 30 years to where it is today,
is fundamental to our business and the services we provide.
The determination of Safety Integrity Levels (SIL) for safety
components and systems is part of GL’s overall Quantitative Risk
Assessment (QRA) service.
SIL assessments are a formal classification method which provide a
record of a quantified assessment of the probability of failure on
demand of a safety system taking account of the consequences of
the failure of the Safety Instrumented Functions (SIFs)
SIL Classification
Following the definition process, a Safety Integrity Level (SIL) target
will be assigned to each SIF. This SIL target will be assigned using a
methodology that will be agreed with the client. The methodology
will take account of both Layers of Protection Analysis (LOPA) and risk
matrix approaches as appropriate.
Methodology & Results:
Information supplied by the client that describes the safety systems
on the facilities was reviewed in order to assess their adequacy in
terms of their reliability and performance. This study utilised a similar
approach to the Safety Integrity Level (SIL) methodology as defined in
IEC 61508 and 61511 and provided recommendations, based on
international standards, on areas for improvements to the
instrumented systems. The approach was to identify the hazardous
events that could occur as a result of failure of the safety instrumented
systems and evaluate the consequences in terms of the safety,
environmental and security of supply from the facility.