A Guide to Quantitative Risk Assessment for Offshore by John Spouge DNV Technica

By John Spouge DNV Technica

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4 Sources of Accident Data The most useful sources of data on offshore accidents are: • WOAD (Worldwide Offshore Accident Databank), produced by DNV. It contains 3500 accidents from 1970-96, gathered from a variety of sources. The computer version includes brief accident descriptions. • Lloyd's Casualty Reports, published daily in Lloyd's List and weekly in Lloyd's Casualty Week. • Newspaper reports in papers serving the main offshore bases, such as the Aberdeen Press & Journal. 3). • Accident investigation reports.

2 Approach The analysis is based on a form that begins with a systematic list of all components in the system, and includes: • • • • • • • • • • Component name. Function of component. Possible failure modes. Causes of failure. How failures are detected. Effects of failure on primary system function. Effects of failure on other components. Necessary preventative/repair action. Rating of frequency of failure. e. consequence) of failure. Failures are rated as critical if they have high frequency or severity ratings.

It is optimised for process hazards, and needs modification to cover other types of hazards. • It does not produce a list of failure cases for a QRA, and the linkage between HAZOP and QRA is usually rather loose. • Documentation is either lengthy (for complete recording) or difficult to audit (for recording by exception). Overall, HAZOP has become a standard tool for process plant design offshore, but is only one of several necessary inputs to hazard identification for a QRA. 6 Application Offshore HAZOP is used quite widely offshore, especially for process plant on production platforms.

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