Blister were observed in the surface of square pipe after being hot zinc-plated.

方管表面热镀锌后出现不同程度的鼓泡现象。

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Such as: stainless steel pipe, square pipe, rectangular pipe, embossed pipe, threaded pipe, platinum-plated tube.

如：不锈钢圆管、方管、矩管、压花管、螺纹管、镀铂金管等。

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Even slight spiraling motion in a square pipe increases the tendency of particles to be maintained in suspension.

水流在方管中稍有一些螺旋运动，将增加泥沙悬浮在水中的作用。

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Within about a one square mile area around that wellhead and the riser pipe and everything else, at any particular time you could have between 14 and 20 ROVs operating down there.

WHITEHOUSE: Daily Press Briefing

The younger Mr. Tsarnaev allegedly told interrogators that he and his brother wanted to detonate up to six more devices in Times Square, Mr. Kelly said, including five pipe bombs and one pressure-cooker bomb similar to the two used in the attack on the marathon.

WSJ: Times Square Was a Target, Officials Say

New York police said on Thursday the Tsarnaev brothers had concocted a spur-of-the-moment plan to drive the hijacked car to Times Square and detonate their remaining explosives: a pressure cooker device and five pipe bombs.

BBC: Boston Marathon bombing suspect moved to prison