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Synopsis
The second of the twelve planned workshops took place in
Leidschendam, The Hague with 31 delegates representing a
good mix of end-users, suppliers and engineering service
providers. There was a significant presence from the offshore,
oil and gas industry but other sectors, including chemical,
pharmaceutical, power generation and water and waste treatment,
were also represented. Many key issues for those industries
and organisations represented were identified and proposals
and solutions to resolve the issues investigated, providing
a significant contribution to the overall project.
Tom
Kuperij from WIB and Bert Knegtering of Honeywell SMS warmly
welcomed attendees. Stuart Nunns provided an overview of
the SIPI project and the proposed web schema. The first
keynote presentation considered the current status of IEC
61508 within the Netherlands from a National and European
(Seveso) regulatory perspective and how this related to
national standards and regulations. The presentation highlighted
how the regulatory bodies cooperate within the Netherlands,
key issues around criteria for ‘site risks’ and how to address
the ‘domino effect’.
The
attendees then identified the most important issues for
themselves and their organisations in respect to implementing
IEC-61508. Breakout groups reviewed and analysed the individual
top issues and agreed the ‘top five’ for their group for
further consideration. Group feedback sessions enabled pro-active
debate on these issues and reclassification.
On
day two, the second keynote presentation covered implementation
issues around IEC 61508 and the implications of IEC 61511
on the process industries. The importance of having a clear
definition of the safety-instrumented function was stressed;
too wide a definition will result in over-engineering and
too narrow to under-engineering. In addition, the necessity
for input to the design process from all disciplines and,
in relation to SIL Assessment, the need to define methods
and criteria for calibrating Risk Graphs. By way of a simple
exercise involving all attendees, it was demonstrated that
many different and conflicting ways of structuring safety
system loops was possible .
The
delegates then concentrated on identifying solutions to
the implementation issues from the previous day, sharing
practical experiences and useful reference material. A majority
of those organisations present agreed to provide material
on their implementation experiences so as to encourage further
technology transfer activities to occur outside the meeting
and within the wider SIPI community and to enable a Functional
Safety resource to be built up and made available within
the wider community.
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