By John Spouge DNV Technica
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Extra resources for A Guide to Quantitative Risk Assessment for Offshore Installations
The weaknesses are: • The implicit assumption that the lower the frequency of accidents that impair the safety functions, the more acceptable the concept design is. This assumption is valid for the type of production, drilling and quarters platforms to which it was first applied. However, it begins to break down for other platforms, such as unmanned developments, platforms with bridge-linked flotels, subsea developments etc, and the CSE is less appropriate for these. • The use of impairment frequencies to quantify a risk level.
It produces risks in the meaningful form of fatality risks. 5 Cullen Forthwith Studies The Cullen Report following the Piper Alpha accident recommended that operators should carry out four key studies ‘forthwith’, without waiting for legislation. 6). An assessment of the risk of ingress of smoke or gas into the accommodation. 11). 7). These studies were carried out by operators in varying levels of detail and quantification, and have become known as varieties of safety studies in their own right.
It ensures that known hazard areas are fully explored. Its weaknesses are: • • • It does not encourage analysts to consider new or unusual hazards. It may not be comprehensive, even for standard installations. It does not produce a list of failure cases for a QRA. 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.
A Guide to Quantitative Risk Assessment for Offshore Installations by John Spouge DNV Technica