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Safety Instrumented System Compliance Review – Case Study

About this project

When EnQuest took over the duty holdership of its North Sea assets from Petrofac, it needed assurance that the installed safety instrumented systems (SIS) met the requirements of functional safety standards, IEC 61508 and IEC 61511. EnQuest commissioned Genesis Oil & Gas Consultants to review the current status of the installed systems and provide the necessary analysis to verify compliance. Where there were shortfalls, Genesis was tasked with producing a plan of action to ensure future compliance. Genesis responded to this challenge by developing a strategy and suite of documentation to systematically review the installed systems and create safety integrity level (SIL) dossiers for each platform to document compliance and record remediation measures for shortfalls in a recommendations report.


“The Challenge – In 2013 the duty holdership of the EnQuest owned Heather, Northern Producer and Thistle North Sea platforms transferred from Petrofac to EnQuest Britain Limited. During the transfer process, EnQuest carried out a preliminary assessment of the safety instrumented systems (SIS). The outcome pointed to the need for a more detailed assessment and for assurance that the installed systems complied with the requirements of IEC 61508 and IEC 61511.”