This article Outlines the features, application and applicable standards at home and abroad of casing pipe union, etc.

综合概述了套接式管接头的特点、应用、国内外标准等。

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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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It is indispensable to install a suitable pipe union in the pipeline, in proximity to the burner, to allow for easy disassembly of the burner and opening of the boiler door.

为了便于燃烧器拆卸和打开锅炉门，在接近燃烧器的管子的地方装上合适的活接是必不可少的。

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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.

FORBES: Magazine Article

The union claims the move would lead to skilled workers, including electricians, pipe-fitters and plumbers, being forced to work on semi-skilled grades and losing up to a third of their pay.

BBC: North Lincolnshire oil refineries workers protest