修井作业的井架天车部位，一直没有天车安全操作平台。
Derrick-crown positions for repairing Wells are always not provided with safe operating platforms for derrick crowns.
把一寸的棕绳穿过天车上的第一个滑轮，在井架内拉该棕绳。
Pull the 1 inch Manila rope inside the derrick and feed and reeve through the first crown sheave.
钻机天车、井架、底座、转盘及游动系统等主要配套件符合API规范。
Main parts such as crownblock, mast, substructure, rotary table and travelling system of drilling rig meet API standard.
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