Abstract: A dome reinforcement shell suitable for a pressure vessel may include a winding of layers of fiber-reinforced composite material tapes, having a dome-shaped portion with a base and a central axis. The layers may include: at least one proximal layer of fiber-reinforced composite material, the at least one proximal layer having a start angle ?1 with respect to the central axis measured at a first end of the proximal layer, with ?1 being in a range of from 0° to 90°, and at least one distal layer of fiber-reinforced composite material, the at least one distal layer having a start angle ?2 with respect to the central axis measured at a first end of the distal layer, with ?2 strictly being in a range of from 0° to ?1.

Abstract: A pressure vessel including an internal fluid storage chamber, and an outer composite structure enclosing or encasing the internal fluid storage chamber. The outer composite structure has a thickness containing both helical layers and hoop layers of reinforcing fibers, wherein at least 20% of a combined thickness of all of the helical layers are located within a 25% innermost thickness of the outer composite structure. The internal fluid storage chamber is defined by a liner including a generally cylindrical central portion having a first outer diameter at a first longitudinal end, and a first dome-shaped longitudinal end portion having a base portion and a first intermediate portion located between the generally cylindrical central portion and the base portion for connecting the first longitudinal end of the generally cylindrical central portion to the base portion of the first dome-shaped longitudinal end portion.

Abstract: A boss assembly may be configured for a pressure vessel having a liner defining a fluid storage chamber and a composite shell enclosing or encasing the liner. Such a boss assembly may include a dome reinforcement part made of fiber-reinforced composite material coupled to a boss part. The dome reinforcement part may be configured to be covered by the composite shell and configured to cover a dome portion of the liner. The boss part may be mechanically coupled to the dome reinforcement part during the dome reinforcement part fabrication.

Abstract: A pressure vessel including a liner defining an internal fluid storage chamber, a first dome reinforcement shell, a boss, and an outer composite structure enclosing or encasing the liner and the first dome reinforcement shell. The liner having a generally cylindrical central portion having a first outer diameter D1 at a first longitudinal end, a first dome-shaped longitudinal end having a base of a second outer diameter D2, the second outer diameter D2 being smaller than the first outer diameter D1, and a first intermediate portion located between the generally cylindrical central portion and the first dome-shaped longitudinal end and connecting the first longitudinal end of the generally cylindrical central portion to the base of the first dome-shaped longitudinal end.

Abstract: A pressure vessel including an internal fluid storage chamber, and an outer composite structure enclosing or encasing the internal fluid storage chamber. The outer composite structure has a thickness containing both helical layers and hoop layers of reinforcing fibers, wherein at least 20% of a combined thickness of all of the helical layers are located within a 25% innermost thickness of the outer composite structure. The internal fluid storage chamber is defined by a liner including a generally cylindrical central portion having a first outer diameter at a first longitudinal end, and a first dome-shaped longitudinal end portion having a base portion and a first intermediate portion located between the generally cylindrical central portion and the base portion for connecting the first longitudinal end of the generally cylindrical central portion to the base portion of the first dome-shaped longitudinal end portion.