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。
Pipe manufacturing process consists of the following stages: hot rolling, where blank gets cut, heated and rolled till it becomes of the needed size and form.
管道的制作流程由以下几步组成：热轧，在这一步坯料被切割、加热、轧制直到尺寸和形状达到要求为止。
The pipe blank dimensions and the necking force were calculated. The structure of necking die for the flame pipe was introduced.
确定了缩口次数并计算了管坯尺寸和缩口力。
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