Page 137 - test2

Component Date Installed
Lower Pipe Ram August 2000
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Middle Pipe Rams August 2000
Upper Pipe Rams August 2000
Shearing / Blind Rams April 2007
Casing Shear Rams September 2009
Lower Annular Overhauled – October 2007
Upper Annular Overhauled – October 2007
Upper Kill Failsafe Valve October 2007
Lower Kill Failsafe Valve December 2006
Upper Choke Failsafe June 2005
Valve
Lower Choke Failsafe January 2006
Valve

Bleed Kill Failsafe August 2009
Mud Boost Valve June 2004
LMRP Connector January 2005
Wellhead Connector Overhauled – October 2009
Cameron
Figure 11 – BOP Component Installment Dates

B. Control and Power Systems

The Deepwater Horizon had a multiplex control system that used both
subsea and surface equipment to operate the BOP stack. The control system was
designed to operate and monitor the closing mechanisms in the BOP stack. The
system used both hydraulic and electrical power to control different elements.

The hydraulic power unit located on the Deepwater Horizon provided the
hydraulic power fluid that could operate the different functions on the BOP stack
and the LMRP. Accumulator bottles both on the surface and subsea provided
hydraulic power to the system. The hydraulic power unit and the accumulators
had sufficient fluid capacities to be able to operate the various BOP stack
329
functions.

328 As previously noted, this was subsequently converted to a test ram.
329 CAMCG‐ 00000236. These volumes were consistent with API specifications.

132