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To: semi_infinite who wrote (368660)	6/14/2010 11:22:15 AM
From: TimF	Read Replies (2) \| Respond to of 793834

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. Deepwater Horizon had such a "deadman switch" setup. A signal is sent to the blowout preventer and if stops (gets cut off by a fire or a hurricane knocking the rig off the well or whatever), the blowout preventer is triggered. If BP cut corners it wasn't with this. It seems that in addition to the human error in removing the drilling mud too soon, the blowout preventer failed. Even locally triggering it with remote controlled underwater robots didn't cause it to kick in.