All pipe lines, valves, and nozzles shall be isolated from the atmosphere by a blank, pipe cap, or plug when not being used.
当不在操作使用时，所有管线、阀门、和喷嘴应用盲板、管帽、或塞子使其和大气隔开。
Nomatter transporting gas or oil, there are pipelines, there are pipe fittings such as bend pipe, reducing joint, T-pipe, pipe cap and so on.
无论是用管道输气、输油，凡有管道的地方，都少不了弯头、异径接头、三通、管帽等管件。
Pipe series: Elbow, tee, cross, movable joint, Bu core, reducer, pipe cap, choke plug, inside the wire, outside the wire, turned-over edge, increaser etc.
管件类：弯头、三通、四通、活接头、卜芯、大小头、管帽、堵头、内丝、外丝、翻边、异径管。
Pipe series: Elbow, tee, cross, movable joint, Bu core, reducer, pipe cap, choke plug, inside the wire, outside the wire, turned-over edge, increaser etc.
管件类：弯头、三通、四通、活接头、卜芯、大小头、管帽、堵头、内丝、外丝、翻边、异径管。
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