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Politics : Politics for Pros- moderated
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To: semi_infinite who wrote (368679)6/14/2010 12:45:09 PM
From: TimF  Read Replies (1) of 793841
 
The riser was never disengaged because of the way the rig sunk so even if everything was in perfect working order, it won't have fired.

I haven't actually worked with such rigs, but I would think that the signal would come from the rig, so if the rig is destroyed the signal should stop. If it comes from below that, perhaps the source should be moved, or you could duplicate the signal.

But whether or not the signal would go off from this type of incident seems irrelevant. The deadman switch on Deepwater Horizon was essentially the same as on any other rig, so your whole "Prior to this, fail safe meant that if a hurricane knocks a rig off a well, the well's equipment would automatically shut off the flow at the sea floor" seems to be pointless. The precaution here was the same as on other rigs. Some have a 2nd backup (with the primary being "push a button, send a signal, activate the blowout preventer, and the first backup being the deadman switch) with an acoustical signal to a switch to activate the blowout preventer, but that apparently wasn't what you where talking about since it didn't really fit your comments. Also the failure here seems to be something with the blowout preventer (since locally triggering it didn't work) so signal issues probably have nothing to do with the problem.
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