Aims to confirm the continued operation of the required safety instrumented systems (SIS) and to contribute to the maintenance of its required safety integrity level. Identified issues have been used to generate guiding principles, which addresses the following: proof testing practices; content of proof testing procedures; format of proof testing procedures; planning and scheduling; proof test records competence; awareness of hazard and risk; management of change. The research indicated that proof testing of SIS is common practice but that some organisations take a more structured and focused approach than others for various reasons. It confirmed existence of conflict between the need for realistic proof testing and the need to minimise downtime, particularly within high throughput continuous processes such as refining and bulk chemical manufacture. The increasing profile of International Electrotechnical Commission (IEC) 61508 : 1998 -2000 Functional safety of electrical/electronic/programmable electronic safety-related systems 1 to 7 was cited as an area of concern by manufacturing organisations over its potential impact on existing installations, notwithstanding its non-retrospective nature.
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