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Unformatted text preview: a shut‐off device (sometimes referred to as a “rig saver”) that 115 sought to ensure that the engine would not over‐speed after ingesting combustible gases. 300 The design of engine shutdown mechanisms on dynamically‐positioned rigs, such as the Deepwater Horizon, is different from the shutdown systems in moored or jack‐up rigs. 301 Instead of the single top‐level shutdown of all engines, a dynamically‐positioned rig is typically designed to allow the rig to activate an emergency disconnect system to separate from the wellhead and allow the rig to escape the hazardous area in the event of an uncontrolled blowout or other emergency. This design also allows for continued use of the engines in an emergency such as a fire. 302 Manual activation of the emergency disconnect system, required on a dynamically‐positioned rig, can add complexity to a rig crew’s response to a well control event and can also create a possible ignition source during the presence of free gas on the rig. 2.
Testing of the Over‐...
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