Its upper end is drill pipe box or union, the nether end is casing pin. It is a crossover with hollow inside.

它是个上端为钻杆母扣或者由壬，下端为套管公扣，内空心的转换接头。

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Compared with available multi-layered pipe union, the present invention has simple manufacturing process, low cost, high noise absorbing performance and high sealing effect.

它解决了已有的多层连接管件存在的制造工艺复杂、加工模具难度大、成本高、吸收噪音不理想以及连接管件与管子之间密封效果不理想的问题。

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On the basis of the structure of homemade standard pipe union joint, a new handy union joint, which can be easily reassembled and no special tool applied, is designed.

在国产标准管件活接头结构的基础上，设计了一种拆装方便，不需专用工具，只要用手即可完成拆装任务的新型快速活接头。

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She flattered them, asked about their harmless projects a Union of Punjabi Landowners, a pipe-dream society for tort reform and so wielded them into a circle, with herself at the center.

NEWYORKER: In Other Rooms, Other Wonders

William Hite, general president of the United Association of Plumbers and Pipe Fitters, says that while his union is "certainly concerned" about the potential for job losses, the mercury rule could also create thousands of jobs for workers who build and install pollution control equipment.

WSJ: EPA Tangles With New Critic: Labor

He pioneered the oil trade with Russia, bartering drill pipe, petrochemicals and engineering services to the Soviet Union in exchange for crude.

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