On an offshore plaftform the major hazards are fires and explosions resulting from an accidental hydrocarbon release. This paper describes a scehme by which the eplosion frequencies and resulting overpessures can be predicted for modules on an offshore platform. The scheme involves the use of event tree analysis and fault tree analysis to determine the potential scenarios with their frequencies and models the flow of gas into the module. The mass flow release rate of gas determines the concentration profile with respect to time which is linked to the ignition source probabilities. From this calculations can be made to assess the likelihood of an explosion at a specific concentration level. This paper proposes two methods of calculating the release rates and provides a comparison of the results obtained.
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