Longitudinal crack of drill pipe box joint is brittle fracture at low stress.

钻杆接头的各种纵向开裂属于低应力脆性断裂。

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Its upper end is drill pipe box or union, the nether end is casing pin. It is a crossover with hollow inside.

它是个上端为钻杆母扣或者由壬，下端为套管公扣，内空心的转换接头。

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An external overflow pipe connects the absorber reaction tank to the box.

外部溢流管把吸收塔反应箱和密封箱连接起来。

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The facility, which is called a "gas governor" and consists of a large slab of concrete, a flue pipe and a control box, is intended to regulate gas supply in the area.

BBC: The gas governor in Oxted

In many cases, that means replacing a round pipe with a wide concrete box-like structure.

WSJ: Towns, ecologists seek climate-friendly culverts

On it he placed a peasant's pipe and tobacco and behind the chair a box of sprouting onions, a symbol of nature and the new life that might grow from art.

ECONOMIST: Van Gogh and Gauguin: Sunny side down | The