Pull the 1 inch Manila rope inside the derrick and feed and reeve through the first crown sheave.

把一寸的棕绳穿过天车上的第一个滑轮，在井架内拉该棕绳。

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This topic can use the Finite element to analysis the strength of the derrick and the mobile shelf.

本课题通过有限元方法对井架和车架进行强度分析。

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Results show that in view of safety and economy design of the derrick and it's lifting installation are reliable.

分析计算结果表明，钻塔结构安全可靠而且经济。因此，钴塔及其起升装置设计是合理的。

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As you remember, we had a situation a few weeks ago where lighting struck the derrick and caused a fire.

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What they do is they sign a lease, and then a company comes along eventually and sets up a well and a derrick, and then they drill the well themselves.

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