Vacuum-insulated pipe

Abstract

To provide a thermal insulation piping with no radially projecting part from a periphery thereof, so as to facilitate insertion of the thermal insulation piping into a pipeline or equivalent. In a thermal insulation tubehaving a vacuum layer between an inner tubeand an outer tube, an evacuation portfor vacuum evacuation is oriented parallel with a longitudinal direction of the thermal insulation piping at an end of the thermal insulation tube. This construction can produce the thermal insulation tubewith no radially projecting part from a periphery thereof, thus providing improved workability when the thermal insulation piping is contained in the pipeline or equivalent. Further, a flexible pipe(s)is/are preferably connected to the evacuation port(s). This can allow increased positional tolerances in the connection of the evacuation port(s) to a vacuum evacuation device.