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Figure 2.9 – BOP stack with lower marine riser package.
                                                    (Courtesy Vetco)
                                   To  provide  100%  redundancy  in  the  BOP  control,  an
                            identical  control  system  is  installed  on  the  stack  180°  from  the
                            other control pod and receptacle. In the event of hydraulic control
                            failure through one hose bundle and control pod, the other system
                            may be actuated.






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