Lightweight piston accumulator

A hydraulic pressure accumulator comprising:

• a vessel body comprising:
• a cylindrical vessel wall;
• an interior space;
• a closeable gas port orifice on one end of said vessel body for communication with gas sources external to the hydraulic pressure accumulator;
• and
• a closeable fluid port orifice on the other end of said vessel body for communication with fluid sources external to the hydraulic pressure accumulator;
• a piston chamber disposed within said interior space of said vessel body and substantially concentric with said cylindrical vessel wall, wherein said piston chamber comprises:
• a cylindrical non-permeable body, wherein an inner diameter of said cylindrical vessel wall is greater than the outer diameter of said cylindrical body of said piston chamber thereby forming an annular volume between said cylindrical vessel wall of said vessel body and said cylindrical body of said piston chamber;
• a piston chamber interior space;
• and
• a piston slidably disposed within said piston chamber interior space thereby separating said piston chamber interior space into a first chamber containing a gas adapted to be compressed under pressure, and a second chamber containing pressurized fluid in fluid communication with said fluid port;
• and
• an end plug placed within said piston chamber, wherein said end plug comprises a fluid port orifice,
• wherein said first chamber comprises an orifice configured to allow communication between said first chamber and said annular volume.