| 摘要 |
PURPOSE:To foresee damage before a fluid leaks outside of a pipeline when an expansion pipe is damaged by multiplexing bellows of the expansion pipe disposed in a pipeline for letting a high-temperature fluid flow and providing a sensor for detecting an inner fluid in a cell surrounded by the bellows. CONSTITUTION:A thin-wall bellows for absorbing thermal expansion of a pipeline is provided on an expansion pipe 4 disposed in the midway of a pipeline, and the bellows is of a multiple structure. The inner bellows 4a is formed by material having corrosion resistance for an inner fluid in a pipeline, considering a lowering of the life of the bellows due to corrosion and fragility. On the other hand, in case of an outer bellows 4b, material is selected, attaching importance to the strength. Further, the bellows is multiplexed and a sensor 6 for detecting a fluid is disposed in a cell 5 surrounded by the inner and outer bellows 4a, 4b, whereby if a fluid leaks into the cell 5, the fluid detecting sensor 6 is operated to surely foresee damage of the expansion pipe 4 which is most weak in strength. |
