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Functional Safety applied to ageing assets - Hazardex 2016

Author : Colin Easton, Prosalus

29 October 2015

**This paper will be presented at Hazardex 2016. Contact us for details of delegate packages & offers**

The COMAH Competent Authority, in its operational delivery guide, recognises BS EN 61511 as the key benchmark standard for functional safety on existing installations and requires that it is applied so far as is reasonably practicable.

However, the standards are voluminous, providing meticulous requirements whose implications can be daunting to the user. Practical ways to implement and comply with the standards are not immediately evident and the user is left to resolve numerous issues on how to implement the standards. The "proven in use" process reviews and scrutinises an existing Safety Instrumented System (SIS) and focuses on design substantiation to meet modern standards and current design intent.

This process recognises that the safety instrumented systems may have been designed and built to meet the standards of the day, but sets a benchmark for their fitness for purpose against current COMAH regulatory requirements. For Safety Instrumented Systems the guidance given in the functional safety standards IEC 61511 and IEC 61508 on proven in use and field experience is used to assess the safety integrity and provides the framework for the substantiation argument.

This paper will discuss a practical lifecycle approach to the application of proven in use and field experience to a legacy SIS using examples from projects undertaken by the authors.

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