管架是通过一个装在支架框和下摇动臂之间的液压缸往返于其贮存位置的。
The pipe racks are moved to and from their stored position by a hydraulic cylinder attached between the mast frame and the lower swing arm.
两个悬臂则固定在支架的内部结构上，并允许管架从贮存位置降到钻柱中线上。
The swing arms are fastened to the inside structure of the mast, and permit the pipe rack to be low-ered from the stored position to the centerline of the drill string.
结合工程设计实践经验，阐述聚丙烯装置烷基铝贮存单元所具有的独特性，从而达到优化布置和完善配管设计的目的。
According to engineering design and practical experience, the author presents the unique characteristics, optimized layout and excellent piping design of TEAL metering unit in polypropylene plant.
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