| 摘要 |
PURPOSE:To make it possible to perform the detection of a leak heat transfer pipe within a short time, by mounting a material having the reactivity with high temp. gas in the vicinity of the heat transfer pipe and detecting the chemical reaction of the material. CONSTITUTION:The water side of a heat transfer pipe 6 is drained and subsequently evacuated under reduced pressure from the nozzle 23 of the header seal lid 15 mounted to a header by a pump 8 through a vacuum exhaust system 16. Because of this, the presence of the leak hole of the heat transfer pipe group bundled by a tube plate 18 is confirmed by the change in the indication of the pressure gauge 17 mounted to the vacuum exhaust system 16. A reactive membrane 21 reacting with high temp. pressure gas is mounted to the header seal lid 15 at the position corresponding to the open end part of each of the heat transfer pipes provided to the header in a state bundled by support rods 20 and a support grid 22. By observing the reaction of the reaction membrane 21, the presence of the leak heat transfer pipe 16 as well as the leak heat transfer pipe 16 can be detected. |
