| 摘要 |
PCT No. PCT/NO90/00078 Sec. 371 Date Nov. 4, 1991 Sec. 102(e) Date Nov. 4, 1991 PCT Filed May 9, 1990 PCT Pub. No. WO90/13730 PCT Pub. Date Nov. 15, 1990.The invention relates to an arrangement in a pipe handling system, especially for handling pipes (4P) in connection with a derrick 1A, wherein the arrangement comprises a tower (1) and two preferably individually controlled operating arms (2a, 2b). The pipe handling system operates favorably in connection with a finger board (4) in which all fingers (4a, 4n) are pointing towards the center of the pipe handling system and especially towards a disc-shaped locking unit (4R) mounted on the top of the tower (1), and in connection with a side-step retraction system designed for use with a top drive drilling system.
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