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In continuation of the 10 Truths of SIS: this newsletter we address
Truths 4-6
What follows is a summary of each Truth, click on a topic for more information or go to www.triconex.com/10truths to view all Truths of SIS.
Truth 4
IEC61511 states that SIS users must show competence in functional safety.
Just as process industries require SIS logic solvers to carry a TÜV certificate of the appropriate SIL, there is also a growing trend to require that the engineers specifying, integrating, programming, installing and maintaining these systems have a TÜV ASI - Rheinland certification of competency.
Truth 5
Your SIS should protect your plant for its lifecycle.
Production assets are built to last, and even when the investment is planned for a 20-year lifetime, many investments frequently extend their life beyond the original design specification. Few safety systems can extend their lifecycle and enhance their capabilities over the complete lifetime of the larger production asset.
Truth 6
You don't have to choose between SIS separation and BPCS integration; you can have
BOTH.
BPCS integration is, without question, a growing need in process industries. It should enable the plant operator to monitor process conditions and prevent hazards, as well as monitor the health of the control system itself. Pressure to reduce costs and to singlesource control system hardware should not be justification for combining safety system functionality with the basic process regulatory controller.
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