| 摘要 |
A conduit comprising a fluid conducting pipe supported within a casing, the casing being formed by a pair of coaxial, radially spaced plastic tubes and including corrugated structure and an insulating material in the space between the tubes. In one embodiment the pipe is supported within the casing in spaced relation to its inner surface by pipe supports disposed along the pipe to provide an insulating air space around the pipe, and in another embodiment the casing is filled with a foamed resin around the pipe. Sections of the conduit may be connected together by a tubular sheath surrounding and extending between the ends of adjacent casing sections and structure including O-rings mounted between the ends of the sheath and the casing sections.
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