Abstract

A 21 m long prototype of a semiflexible multi-layer insulated cryogenic envelope was built and tested to prove the suitability and economy of such a thermal insulation system for superconducting power transmission cables and liquid gas pipelines. The enclosure consists basically of an outer rigid tube at ambient temperature, a corrugated inner tube containing the cryogenic fluid, and superinsulation within the evacuated annulus. The flexible inner pipe is pulled into loosely connected rigid “spacer tubes” which are held coaxially to the outer tube by synthetic ropes. These spacer tubes serve also as winding cores for the insulation.

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