水电站压力钢管直径是一个重要的设计参数。
The diameter of the penstock of hydropower station is an important design parameter.
钢管直径变化使得钢管造价和发电效益同时发生变化。
The change of steel pipe diameter makes steel pipe value and power benefit change at the same time.
立管：直径四英尺的钢管(称为“立管”)将船和钻孔连接起来。
Riser pipe: a four-foot-diameter steel pipe called a riser connects the ship to the borehole.
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