| CPC F16L 3/02 (2013.01) [F01D 25/30 (2013.01)] | 15 Claims |

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1. A pipe unit comprising:
a first pipe;
a second pipe located inside the first pipe;
a plate member in contact with an outside surface of the second pipe;
a tube member having a tubular shape and fixed to the plate member such that a first end portion in an axial direction of a center axis of the tube member is in contact with the plate member; and
a base configured to support a second end portion of the tube member in the axial direction,
wherein the plate member includes a supported portion supported by the tube member, and an inner side portion surrounded by the supported portion, and
wherein the inner side portion has a smaller heat capacity per unit volume than the supported portion.
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