... 旋转的，转动的 rotational 大直径管 ；大口径管 large diameter pipe 水总管，气总管 water or gas mains ...
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在管道铺设或大型梁架焊接过程中，往往会遇到两个或多个不同轴线的大直径管件相交的情况。
During pipe line laying or large beam support welding, it often meets crossover of two or multi different axis large diameter pipe piece.
简要介绍了俄罗斯目前对大直径焊管的需求及生产现状。
This article briefly introduced the demand and production situation of large diameter welded pipe in Russia.
这对于加工大直径、高精度的管类件具有重要的意义。
The new technology is especially fit for working big diameter and high precision tube parts.
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