This Paper describes a new approach to explosion loading and response developed by MSL as part of a project to develop Guidance for the Design and Assessment of Offshore Installations against Fire and Explosion accidental events. The Guidance document developed for BP is being considered as one of the source documents of the new Guidance Notes for the UK. This project is in progress and has been financed by UKOOA and the HSE. The Guidance document is based on the risk matrix approach described in API RP 2A (21st edition) and is being considered as one of the source documents for the development of the new API Recommended Practice on Fire and Explosion Engineering. This paper outlines the new thinking which is being incorporated into the new Guidance Notes and the new API standard. The paper concentrates on the areas of explosion loading and response and in particular the use of simplified methods in structural explosion assessment and design.

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