Videos - I believe they may be working on some, as one of our posters (4Mars, if I recall correctly) mentioned. Here's an excerpt of what subsea accumulators are used for. DDI's SAMs actually combine some additional functionality in terms of serving as an anode skid as well. You can see the anodes within the SAMs.
http://www.westengineer.com/publication/spe.htm#accumulator "Blowout Preventer (BOP) hydraulic control systems have long used accumulator bottles to deliver energy to function equipment more quickly than the pumps can alone. With the advent of subsea stacks, people recognized the need to modify these accumulators and the operating procedure to reflect the effects of hydrostatic head. The continued expansion into deeper waters, coupled with an increase in the system operating pressure for the latest generation rigs, has necessitated new methods of calculating energy available in subsea accumulators"
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