| 摘要 |
Apparatus for connecting tubulars comprises tongs (1, 11) for gripping the tubulars, having openings (3, 13) which can be aligned to allow tubulars to enter the tongs, and a detection apparatus (15) for detecting the location of a joint between the tubulars. The detection apparatus comprises a set of keys (19) disposed along an axis substantially parallel to the axis of the tubulars, the keys being individually displaceable on contact with the tubulars as the tubulars enter the tongs through the openings. The detection apparatus further comprises a set of sensor means (22), each arranged to detect displacement of a corresponding key. The position of the joint can then be determined from the displacement of the keys.
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