| 摘要 |
The invention relates to a method for manipulating a gas heavier than air in a tank. Said tank comprises a successive closure and opening arranged on the top thereof, an input for said heavy gas into the tank when it is closed and an off for said input when the tank is opened, and a depression unit arranged on the periphery of the top of the tank provided with a unit for sucking out the heavy gas effluent from the top of the tank to a closed chamber.
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