栏垂直的公差极限应基于被探测高度的基板点和准确的中线柱的测量。
The limit of tolerance in column plumbness shall be based on the height from the baseplate to the point being plumbed and shall be measured from the true center line of the column.
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.
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