Lloyds Register reports that its BOP risk model, developed in response to the Deepwater Horizon disaster, represents a first step towards risk-informed decision-making for safer drilling and a tool for consistent communication with stakeholders in the event of a subsea BOP failure. The BOP Risk Model combines expertise from Lloyds Register’s consulting and drilling units. The tool provides a fault tree risk model developed with Lloyds’ RiskSpectrum PSA1 and delivered via the online RiskWatcher front end.
The BOP risk model models the risks and potential consequences of BOP component failure and provides advice on ‘when to pull the BOP for surface inspection and repair.’ A block diagram represents key BOP functions and the logic that connects the different assemblies and sub-components. Failure mode analysis is performed across all components. RiskSpectrum is then used to map out fault trees. BOP risk levels can then be assessed in RiskWatcher by comparing the remaining available redundancy of the BOP capabilities with the minimum requirements in the company policy, industry standards and regulatory regulations and rolled-up into ‘pull’ or ‘no pull’ signals.
Lloyds is now working on a web version of RiskWatcher to allow for collaborative work across a corporate intranet. A future release will add event history and details of out-of service equipment. More reliability metrics will allow for fine grain compliance with safety integrity levels and conditional probabilities for a defence-in-depth approach. More from Lloyds.
1 Probabilistic Safety Analysis.
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