Abstract: A cargo holding system is provided for a marine freight vessel. The system includes a plurality of filament composite walls defining a cargo holding cavity of the vessel. A liquid impervious liner is disposed about the cavity within the walls for holding liquid cargo. The liner is collapsible to allow solid cargo to be loaded into the holding cavity.

Abstract: A method of fabricating a removable mandrel for use in filament winding a container, includes the steps of providing and inflating an internal bladder. A dry 3-D fabric layer of a given thickness is layed-up about the inflated bladder. An external vacuum/pressure bag is installed about the dry fabric layer. The dry 3-D fabric layer is impregnated with a liquid soluble resin between the internal bladder and the external bag. The resin then is cured to rigidify the fabric layer to form a mandrel structure. The container then can be wound on the mandrel formed by the cured and rigidified fabric layer, and the resin can be subsequently washed out to remove the fabric layer.

Abstract: A method of fabricating a filament wound container includes providing a mandrel for winding a filament composite structure of a given thickness and having a closed end. The closed end is removed from the remainder of the composite structure, and the mandrel then is removed from the composite structure. A replacement closed-end member is positioned on the composite structure at the location of the removed closed end. The replaced closed-end member may be the original removed closed end. An overwrap thickness is filament wound about at least a portion of the composite structure and the replaced closed-end member.