1·Sometimes the tongs are snubbed to the derrick leg. This method should not be used.
有时候会把钳尾绳装在井架大腿上，这种方法不可取。
2·And all those give as well a reference to offshore derrick design.
此方法也可供海洋井架电算参考。
3·On basis of the reliability theory, the basic concept of derrick reliability is expounded.
根据可靠性理论基础，阐述了井架可靠度的基本概念。
4·Along with the lowering of the load capacity of the derrick, the strain parameters of the structure change accordingly.
与承载能力降低的同时，井架结构的应变参数也发生相应的变化。
5·The formulas used for checking the integral stability of derrick and the method and criterion of analysing the problems arc also presented here.
文章对井架总体稳定校核所用的计算公式及分析问题的方法和准则也作了介绍。
1·Derrick: the main hoist winch and a system of elevators lifts 1,250 tons of pipes and machinery through the 72.
钻塔：主起吊绞车和升降机系统可通过船底72英尺宽的开口，提升1,250吨重的管道和机械。
2·Equipped with suitable derrick and well controlled device in drilling a shallow gas well water drills proved to be able to reduce shallow gas well drilling cost.
通过某浅层气井的施工实例，阐述了水井钻机安装合适的钻塔底座和并控装置，可降低浅层气井建井成本。
3·Equipped with suitable Derrick and well controlled device in drilling a shallow gas well, water drills proved to be able to reduce shallow gas well drilling cost.
通过某浅层气井的施工实例，阐述了水井钻机安装合适的钻塔底座和并控装置，可降低浅层气井建井成本。
4·The model results of the derrick are also analyzed.
然后对钻塔的模态结果进行了分析。
5·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。
1·Nice to see you on your feet. Who sent the derrick?
很高兴看到你的脚。这是谁送来的起重机？
2·As luck would have it, the thing weighed more than it looked, and lifting it was a job more suited to a derrick than a hundred-and-ten-pound college student.
祸不单行，这玩意儿比它看上去要重，得用起重机才能把它抬起来，而不是个体重110磅的大学生。