放空管(blow-down pipe),就是为把容器、管道等设备中危害正常运行和维护保养的介质排放出去而设置的部件。
... 排气辊，(伏辊上方)小压辊：air bells removing roll 排气管;放空管：escape pipe 排气阀;排放支管：bleeder ...
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打开速闭阀上游放空管线上的阀门。
Open the valve on the vent line just upstream the trip valve.
改变了移液管的热载体加热、放空管线和回液管线。
The heat carrier heating, blow down and liquid recovery pipeline of the transfer pipe was changed.
不准在室内排放氢气。吹洗置换，放空降压，必须通过放空管排放。
Hydrogen is not allowed to be discharged indoors. Vent pipe must be used to do the purging and depressurizing work.
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