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| Example Hydrocarbon containment is safety critical as a release of hydrocarbon has the potential to be a Major Accident Hazard. The hydrocarbon containment system (the SCE) is composed of valves, pipes, flanges, vessels etc that are rated to a certain pressure. The way in which this pressure is determined such that the risk of over-pressurisation is appropriately managed should be given in the safety case, but without necessarily the need for an exhaustive list of pressure ratings of the hydrocarbon containment system. If the inlet part of the process system is fully rated for the maximum pressure, this should be stated along with the justification for what the maximum pressure is. Other parts of the process plant may have a lower rating as they are protected by pressure safety valves and pressure instrumentation that causes the source of pressure to be isolated. The way in which this is appropriately designed and managed should be stated. Example The process used to define the rating and required location of passive fire protection should be described, but the location of each part of the passive fire protection does not necessarily need to be described. 27 4.4.6.2 Hazards and Inherent Safety The ALARP assessment must demonstrate that the risk from each hazard is reduced to a level that is ALARP. This will involve the consideration of, amongst other things, inherent safety and risk reduction measures that are not in themselves SCEs including Elimination and substitution of hazards Overall concept (subsea wells, manned platforms etc Inherent safety Layout Reduction of potential leak points Location of the petroleum infrastructure Distribution and number of persons and Means of transportation. Example During the design process for an offshore platform, the need for an additional hydraulic power unit in a naturally ventilated module is identified. As part of the ALARP assessment it needs to be considered how the skid affects the natural ventilation and ensure that the risk from explosion and fire hazards are still ALARP with the change in ventilation. As the layout can be more readily changed during design, it is likely that ventilation considerations can be accommodated such that the additional risk is minimal and ALARP. Download 0.73 Mb. Share with your friends:
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