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Unformatted text preview: y BOP stack components, i.e., blue and yellow pod battery voltages and various ram positions. DNV’s report is included at Appendix D. 1.
Sequence of Events Related to the Blind Shear Rams There are two possible scenarios for how the blind shear rams were activated and closed: (1) the autoshear circuit was activated on April22, by cutting the poppet valve between the LMRP and lower BOP stack; or (2) the automatic mode function had been activated by loss of the multiplex and hydraulic lines on April 20. In its reports prepared for BOEMRE, DNV presented findings with respect to both of these scenarios. However, DNV concluded that the most likely scenario for the activation of the blind shear ram was from the autoshear circuit. 341 By the time the BSR was activated and closed, the drill pipe was positioned outside of the BSR blade surfaces. As the BSR closed, this portion of the drill pipe became trapped between the ram block faces and prevented them from fully closing and sealing. This resulted in...
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