| 摘要 |
The invention relates to a double-walled metal pipeline with incorporated insulating coating, intended for ducting very hot gases. The annular spacing and the secure fastening of the two walls 1 and 2 are obtained via rigid insulating rings 3 and 4 trapping a granular or pulverulent insulating material 5. Sealing in the region of the interlocking is obtained via a ring made of flexible flame-retardant material 6 retained by a removable elastic snap ring 7. Secure fastening of the pipelines is carried out via a hollow collar 8 which bears against a conical flared part 1b made at the female end of the pipeline and a conical bead 1c made in the external wall 1 of the pipeline. Application: ducting of very hot gases and especially of smoke emitted by multifuel boilers. <IMAGE>
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