By John Spouge DNV Technica
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Extra resources for A Guide to Quantitative Risk Assessment for Offshore Installations
The methodology is similar to that for a fatality risk assessment, but the impacts of each event on property, the environment and on production are also modelled. The risks of these various outcomes are combined using cost-benefit analysis. The strengths of the approach are: • Comprehensive consideration of all relevant risks. • It provides a framework for integrating all safety studies. • It is applicable to all types of platform concept. The weaknesses are: • The methodology is complex. • Criteria for valuing environmental damage in monetary terms are not yet agreed.
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.
Overall, hazard checklists are very useful in a hazard identification process, but are insufficient on their own except for standard installations. 1 Outline A hazard and operability (HAZOP) study is a systematic critical review of a process plant design. It is normally used to generate recommendations to improve the safety and operability of a design, but it can in principle be used to identify hazards for a QRA as well. Guidance on HAZOP is given by CIA (1977), CCPS (1992a) and Kletz (1992). Although these refer to onshore process industries, HAZOP of offshore process equipment is essentially the same.
A Guide to Quantitative Risk Assessment for Offshore Installations by John Spouge DNV Technica