| 摘要 |
PURPOSE:To relieve pearlite pressure at the time of opening an inner tank by lowering the temperature of said tank after expanding said tank through feeding it with pressurized high temperature gas so as to excessively compress pearlite intentionally. CONSTITUTION:When an inner tank 11 is fed with pressurized high temperature gas for warming up, said tank 11 is thermally expanded and pearlite 13 is compressed, while as an effect of its reaction force, powder pressure is raised and a pressure P4 works. However, the inner tank 11 is supported by a pressure PA' due to gas and its inner stress is comparatively lessened. Subsequently, feeding of the high temperature gas is stopped to gradually decrease the temperature of the inner tank 11 close to its normal temperature, then the tank 11 thermally contracts by deltaE, while powder pressure P4 of the compressed pearlite 13 is relieved to turn P5, and comes to be lower than at least the powder pressure P3 during normal warming up. |
