| 摘要 |
PURPOSE:To provide a positive discharging of noxious gas under saved energy by a method wherein a vacuum pump is applied from a discharging port for the noxious gas or combustible gas in a piping or in a room so as to suck the noxious gas and then the pressurized inert gas is supplied from the inert gas feeding inlet port while the vacuum pump is being operated. CONSTITUTION:Either noxious or combustible (explosive) gas in the pipe is sucked and discharged in such a way as the interior of the pipe may show a pressure of as negative as possible under an operation of vacuum pumps 18A, 20A and 22. Under a near limited condition of the vacuum pumps 18A, 20A and 22, change-over valves 14A, 15A and 16 or the like are opened for supplying either nitrogen or steam and further either a nitrogen supplying valve also acting as an adjusting manual valve 11 or a steam supplying valve also acting as an adjusting manual valve 13 is gradually opened. In this way, at first, the condition in the system shows a uniform negative pressure, the remained gas in the system is applied with both suction and pushing actions and then completely discharged out of the system with either the pressurized nitrogen or steam. Therefore, the inert gas is of a relatively small volume and it completely replaced with the gas contained in the system.
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