To exactly maintain the equipment dimension of the pipe inside without rise of the production cost by providing the outer metal pipe on the outside of the inner pipe for flowing an elevated-temperature molten substance and providing a supporting pipe that is seamless in the radial direction and is made of a heat-resistant material on the outside of the resultant multilayered metal pipe.
At least one of outside metal pipe 14 having a thickness thinner than that of the inner pipe 12 is provided on the outside of the inner metal pipe 12 for flowing an elevated-temperature molten substance to form a double- layered metal pipe 11. In addition, a supporting pipe 16 that is seamless in the radial direction and made of a heat-resistant material, for example, a heat- resistant ceramic material is provided to support, via fixation part 18, the multilayered metal pipe 11. When necessary, a rotor, for example, a screw pump 20, a stirrer or the like is arranged in the inner pipe 10 to homogenize the flowing elevated-temperature molten substance. In a preferred embodiment, at least the site to which this rotor is arranged is made this conduit structure whereby the inner and outer metal pipes 12, 14 can be formed with a thin form of platinum or platinum alloy.
OKADA MISAO
ARIGA YASUTO
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