Patent attributes
An apparatus comprises a plurality of substantially cylindrical pressure vessel structures. Each cylindrical pressure vessel structure has first and second opposite ends. A first cap is positioned at the first ends of the plurality of cylindrical pressure vessel structures. The first cap includes a first dome-shaped protrusion that corresponds to each of the first ends. A first saddle is defined between adjacent first dome-shaped protrusions. A second cap is positioned at the second ends of the plurality of cylindrical pressure vessel structures. The second cap includes a second dome-shaped protrusion that corresponds to each of the second ends. A second saddle is defined between adjacent second dome-shaped protrusions. A reinforcement structure extends around the first and second caps, and is disposed within one of the first saddles and one of the second saddles.
