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Unformatted text preview: 378 As noted previously in this Report, the Panel found no evidence that Transocean had submitted the variable bore rams to a major inspection (as defined in API RP 53) any time since installation in 2000. The Panel did not find any evidence of an actual deficiency in Transocean’s maintenance of the BOP stack that played a role in the failure of the BSR to shear the drill pipe and seal the well. L.
BOP System Leaks BOP systems may develop hydraulic fluid leaks in their various components. Part of regular BOP stack maintenance is to identify and assess the seriousness of leaks to hoses and valves. While Transocean asserts that there were no leaks on the Deepwater Horizon BOP stack when it was deployed at the BP‐HZN‐MBI00254566. BP‐HZN‐MBI00254591. 378 Cameron Special Procedures identified in EB 902 D, CAMCG 00003345. 376
377 151 Macondo well, rig personnel identified three leaks on the stack prior to the blowout. 379 The first leak was a “very small” leak on the control hose for the upper
annular surge bottle that resulted from a loose fitting. 380 The leak was discovered about two...
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