Safety lifecycle adoption

This International Standard sets out an approach for safety lifecycle activities to achieve these minimum standards. This approach has been adopted in order that a rational and consistent technical policy is used. The objective of this standard is to provide guidance on how to comply with lEC 61511-1 ANSI/ISA-84.00.01-2004 Parti (lEC 61511-1 Modi. 

The functional safety achieved in any process facility is dependent on a number of activities being carried out in a satisfactory manner. The purpose of adopting a systematic safety lifecycle approach towards a safety instrumented system is to ensure that all the activities necessary to achieve functional safety are carried out and that it can be demonstrated to others that they have been carried out in an appropriate order. lEC 61511-1 ANSI/ISA-84.00.01-2004 Parti (lEC 61511-1 Mod ) sets out a typical lifecycle in Figure 8 and Table 2. Requirements for each lifecycle phase are given in Clauses 8 through 16 of lEC 61511-1 ANSI/ISA-84.00.01-2004 Part 1 (lEC 61511-1 Mod). 

For the Safety Lifecycle to be properly adopted and implemented, it must be integrated into the overall PSM for the plant so that its importance is well recognized and prioritized. This integration is sometimes the biggest challenge for a plant due to organization barriers. 

In order to deal in a systematic manner with all the activities necessary to achieve the required safety integrity for die E/E/PE safety-related systems, lEC 61508 adopts the Overall Safety Lifecycle indicated in Figure 3 (lEC 61508/Edition 2 shown) as the technical framework. The Overall Safety Lifecycle specified in lEC 61508 should be used as a basis for claiming conformance to the standard, but a different Overall Safety Lifecycle can be used to that given in Figure 3, providing the objectives and requirements of each clause of the standard are met. 

Evidence of die need to adopt an approach dtat covers all phases of the Overall Safety Lifecycle is illustrated in a study undertaken by the UK Health and Safety Executive (HSE 2003). The study analyzed a number of accidents and incidents... 

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