THERMALLY INSULATED CONDUCTION OF FLUID

摘要

THERMALLY INSULATED CONDUCTION OF FLUID A corrugated metal inner tube is provided with a helical spacer and an outer jacket of an extruded synthetic, there being a metal foil with overlapping edges provided as lining along the inside wall of the outer tube and being seated on a helical spacer on the inner tube; the otherwise unoccupied space between the tubes is filled with foam, preferably bonded to the metal foil,- overlapping edges of the foil are bonded to each other; the metal foil prevents ingress of moisture from the outside by diffusion, as well as escape of pore-sustaining gas filling from the foam.