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Published March 23, 2011, 12:00 AM

Blowout preventer


FILE - In this Sept. 4, 2010 file photo, workers watch as the Deepwater Horizon blowout preventer stack is lifted onto the deck of the Helix Q4000 on the Gulf of Mexico near the coast of Louisiana. A federal probe has found that a trapped piece of drill pipe prevented a blowout preventer from properly sealing to stop last year's massive Gulf oil spill. A report released Wednesday, March 23, 2011 identified the primary cause of the blowout preventer's failure as the blind shear rams failing to close completely and seal the well due to a portion of drill pipe becoming trapped. (AP Photo/Patrick Semansky, File)
Read the article: Gulf Oil Spill Investigation: Blowout Preventer Was Flawed