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Unformatted text preview: nded BSR shearing surfaces and would not have sheared as intended. As the BSR closed, a portion of the drill pipe cross section became trapped between the ram block faces, preventing the blocks from fully closing and sealing. DNV Report, Vol. 1, at 23‐24. Id. at 23. 340 Id. at 24. 338 339 138 DNV’s forensic examination found that the main failure of the Deepwater Horizon BOP stack was caused by a portion of the drill pipe being trapped outside of the blind shear ram cutting surfaces, which prevented the blind shear rams from fully closing and sealing. DNV was able to reconstruct the segments of recovered pipe through analysis of the segments of pipe and tool joints that were located throughout the BOP and riser, including analysis of wear patterns, drill pipe dimensions, damage and deformation markings, sheared ends of recovered drill pipe, and physical differences between the two recovered joints of drill pipe. DNV also determined that a tool joint had been located in the upper annular while flow was present. DNV also noted the as‐received condition of man...
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