Expandable Cryogenic Pipe
This paper describes a proposed technique for rapidly and economically erecting a cryogenic pipeline of any size and length in almost any environment, terrestrial or extraterrestrial The concept consists of a rigid, foam-insulated pipe which, before its initial use, can be packaged in a very small volume. Specifically, the pipe will consist of five separate layers. The innermost layer will be a thin membrane, probably mylar, of 1 to 5 mils thickness. To provide additional burst strength the mylar tube will be surrounded by a fabric such as fiberglass or dacron rigidized with polyester or polyurethane resin. Several inches of low-density polyurethane foam will provide the insulation, The exterior surface of the foam will be protected by a fiberglass shell, which will also provide the majority of the structural strength of the composite pipe. A thin, aluminized mylar membrane will surround the outside of the pipe to help prevent the degradation of the foam caused by the absorption of water vapor and atmospheric gases. Figure 1 is a photograph of a handmade specimen and Fig. 2 is a cutaway drawing of the expandable cryogenic pipe.
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