A new method form aking arbitrary section tube was introduced.

介绍了一种新型的变断面管无模拉伸成形方法。

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The chemical cleaning method of convection section tube for hydrogen manufacturing furnace was recommended.

介绍了制氢炉对流段炉管的化学清洗方法。

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Using a 1/16" drill bit, drill a hole in the middle of the cross section tube above. This will allow gas to escape during welding."

使用1 / 16“钻头，钻一个孔在上面管中间的横截面。这将使天然气逃脱焊接过程。

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Until a few years ago, to treat aortic aneurysms surgeons cut a patient from breastbone to pubic bone and replaced the damaged section with a synthetic tube.

FORBES: By the Numbers