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Procuring systems to IEC 61508/IEC61511: Some key decisions - to be presented at HazardEx 2012

Author : Ron Bell OBE – Engineering Safety Consultants

20 December 2011

The presentation will focus on a number of key decisions that the user of a system, designed to IEC 61508/IEC 61511, needs to be aware of when specifying the system and which could impact on operation and maintenance matters having resource implications.

Decisions affecting trade-off between capital cost and maintenance costs will be addressed. The presentation will cover:
· SIL determination assumptions;
· Low demand/High demand considerations;
· Risk reduction contribution from the Basic Process Control System;
· Protection Layers in the Basic Process Control System;
· Proof Test frequencies and the effectiveness of Proof Tests.

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