BP to cut Macondo drill pipe; swap BOP

Choppy seas delayed BP PLC's plans to retrieve the Transocean Ltd.'s Deepwater Horizon semisubmersible blowout preventer (BOP) with two pieces of pipe inside it and to install another BOP.Plans called for the drill pipe going down into the blown-out Macondo well to be left in place, at least for now, National Incident Commander and retired Adm. Thad Allen said.Scientists and engineers were concerned about the force that 6-8 ft waves might put on the lines that will lift the BOP off the Macondo well.Crews calculated a safe force level for removing the BOP while avoiding damage to the well's casing hanger and seal assembly. The waves on Aug. 30 exceeded that dynamic loading factor, Allen sa...

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