A polar end ring mechanism for use with composite pressure vessels. The end ring is designed to support a pressure vessel during its formation via filament winding. The end ring helps define an opening at one of the polar ends of a tank. Spikes positioned along a portion of the end ring help prevent rotation or translation of the tank during formation and provide an improved mechanical lock with the tank body. A cap may then be secured to the polar end ring after formation in order to close the pressure vessel.

A polar end ring mechanism for use with composite pressure vessels. The end ring is designed to support a pressure vessel during its formation via filament winding. The end ring helps define an opening at one of the polar ends of a tank. Spikes positioned along a portion of the end ring help prevent rotation or translation of the tank during formation and provide an improved mechanical lock with the tank body. A cap may then be secured to the polar end ring after formation in order to close the pressure vessel.

Disclosed is a liner reel, a cassette, a let off station and a method for collecting a liner, wherein the liner reel has a core and a shell that is concentrically mountable to said core for rotation together with said core about a liner reel axis, wherein the shell has a collection wall that extends in a circumferential direction about the liner reel axis when the shell is mounted to the core, wherein the collection wall is arranged for receiving the liner, wherein the core has a support wall extending in the circumferential direction for supporting the collection wall at least with a vector component in a radial direction perpendicular to the liner reel axis, wherein the collection wall is at least partially contractible in said radial direction when the shell is removed from the core.

Disclosed is a liner reel, a cassette, a let off station and a method for collecting a liner, wherein the liner reel has a core and a shell that is concentrically mountable to said core for rotation together with said core about a liner reel axis, wherein the shell has a collection wall that extends in a circumferential direction about the liner reel axis when the shell is mounted to the core, wherein the collection wall is arranged for receiving the liner, wherein the core has a support wall extending in the circumferential direction for supporting the collection wall at least with a vector component in a radial direction perpendicular to the liner reel axis, wherein the collection wall is at least partially contractible in said radial direction when the shell is removed from the core.