This article introduces the construction technology, facilities layout, derrick system security, quality and safety requirements.

结合工程实践对施工工艺、设施布置、井架制安、质量安全要求进行了介绍。

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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。

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As a new riser handling system, the vertical riser handling system is an extensional application of successful derrick drill stern vertical handling system in drilling machines.

隔水管垂直存放系统是一种新颖的隔水管处理系统，它是钻机行业井架内钻杆垂直存放系统成功解决方法的外延应用。

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One of two Shell ships that drilled last year in the Arctic Ocean, it has a 160-foot derrick rising from its center and no propulsion system of its own.

NPR: Grounded Shell Oil-Drilling Ship Refloated