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characteristics.
The hydraulic/pneumatic system is made up of an
accumlator assembly; an accumulator backup system, consisting of
a series of air-pressure bottles; a fluid supply unit; and hydraulic
fluid. The accumulator assembly cylinder contains a floating
piston that acts as an interface between the hydraulic fluid
operating the compensator unit and the pressurized air from the air
supply system. When vessel heave causes the compensator unit to
stroke, fluid is forced in and out of the compensator cylinders and
the accumulator, moving the floating piston. If the accumulator
runs out of fluid, the floating piston will seat on the bottom,
preventing air flow onto the hydraulic hoses — a safety feature.

Figure 2.16 – Hydraulic cylinder assemblies—dual and single
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