| 摘要 |
A conduit comprising a pipe(6,7), an electrical heater (8)extending along the length of the pipe, and a thermally insulating jacket (12,13)extending around the pipe and heater. The pipe comprises a plastic inner tube(6). The plastic inner tube is received within a deformable metal tube (7)such that the plastics inner tube and deformable metal tube form a composite double-walled structure.
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