This paper demonstrates the systems and processes to be implemented to achieve an operationally efficient platform, with the lowest manpower requirement, whilst using inherently safer design principles. Manning of the platform has a significant impact on the cumulative risk to the individual and also impacts on operational costs. Therefore, the challenge is to embed inherently safer principles across all elements of the project, to ensure the risks to individuals and the environment is considered and is ALARP.

Achieving operational efficiency requires challenges to many, "business as usual", Project practices. It requires the optimisation of offshore man-hours and maximization of availability, through the elimination or simplification of equipment and processes in order to minimise complexity. Project discipline is required to ensure the inclusion of only justified equipment to meet the required functionality and negate the continual addition of unnecessary equipment. Other aspects to be considered are the elimination of defects, maintainability, and initiatives to reduce leak potential, in order to deliver optimal residual risk.

It is clear from numerous incidents around the world, that equipment failures and the inability of people to react to a Major Accident Event, demonstrates that "inherently safer" passive systems are a better approach than reactive systems. This approach improves reliability and availability whilst reducing requirement for personnel intervention.

Efficient operations with the lowest possible risk to individuals can be achieved by the implementation of an inherently safer approach and the establishment of appropriate Operational Philosophies. This approach potentially leads to minimum manning or a "Not Permanently Attended Installation". It can also be demonstrated that costs of reducing the risks are not grossly disproportionate to the benefits that may be achieved.

This paper is based on the experiences gained by Woodside Energy Ltd through major field developments in the Australian North West Shelf Region e.g. Angel development.

(Key words:- Inherently Safer, Operational Efficiency, Not Normally Manned Installation, Not Permanently Attended Installation, Angel Platform, OPEX).

Note:- Any views or opinions expressed in this paper are solely those of the authors and do not necessarily represent those of Woodside.

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