An Existing Plant vs. New (Retrofit) Safety System: A U.S. Case History

Keywords: Incident investigation, ANSI/ISA S.84, IEC 61508, PHA, HAZOP, LOPA, SIS design, SIL verification, Audit, Review

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Abstract:

Numerous articles and papers about risk, reliability and safety have followed in the years since the ANSI/ISA S.84.01 was first published in 1996. Industry has been inundated with information about standard’s addressing hazard and risk analysis requiring user’s to implement safety, but little has been written on how to perform this work in practice. After an incident, resulting in a $250 Million loss, a team of experts analyzed the existing process design via HAZOP and other PHA methodologies. The team concluded that the safety loop protecting the process required an upgrade and revision as it was under engineered to protect the process adequately.

This paper demonstrates through a practical case study how compliance with safety standards can be met understanding the importance of good incident investigation, the need for competent people, adequate review of safety requirements and good safety engineering. © 2009 Inside Publishing. All Rights Reserved.

Volume: 2009   Issue: 1
EUR 4.98
(Pages: 10, Words: 3321)

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