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Safety and environmental standards for fuel storage sites
Final report
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51 Additional general guidance on operating high reliability organisations and the management
of general operations human factors is in Part 5 and Appendix 5 of this guidance. Dutyholders
should also consult broader human factors guidance when reviewing or implementing the human
elements of their safety management systems.
Management of SIS
52 A SIS management system should include the following elements specific to safety
instrumented systems. The management system may be part of an overall site-wide safety
management system but the following elements should be in place for each phase in the SIS
lifecycle:
safety planning, organisation and procedures;
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identification of roles and responsibilities of persons;
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competence of persons and accountability;
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implementation and monitoring of activities;
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procedures to evaluate system performance and validation including keeping of records;
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procedures for operation, maintenance, testing and inspection;
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functional safety assessment and auditing;
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management of change;
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documentation relating to risk assessment, design, manufacture, installation and
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commissioning;
management of software and system configuration.
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Safety planning and organisation
53 Safety planning should identify all the required tasks that need to be performed at various
stages and allocate roles and responsibilities of people (departments, individuals, staff or
contractors) to perform those tasks.
54 The organisation and planning should be documented and reviewed as necessary when
changes occur throughout the operational life of the system.
Responsibilities and competence
55 The roles and responsibilities associated with the SIS (such as design, operation,
maintenance, testing etc) should be documented and communicated. This should include a
description of the tasks and who is responsible for performing the tasks.
56 People with responsibilities should be competent to perform their tasks consistently to the
required standard. The required knowledge, understanding and skills for the competences can
be wide ranging and depend on the role and the type of task, and these may be for design,
engineering, system technology, hazard and safety engineering, regulations, management,
leadership, maintenance and testing.
Performance evaluation
57 Arrangements should be in place to evaluate the performance and validation of a safety
instrumented system. This should include validation that the system design meets the
requirements of BS EN 61511 and the system operation fulfils the design intent.
58 Failures of the system or of any component should be investigated and recorded along with
any modifications and maintenance performed.
59 The details of any demands on the system, and system performance on demand, should
be recorded including data on any spurious trips, any revealed failures of the system or its
components and, in particular, any failures identified during proof testing.
60 Records of all these events should be kept for future analysis. Records may be paper or
electronic.