| 摘要 |
The present invention relates to a riser-tensioner for exerting a tensile force from a drilling vessel or drilling platform upon a riser, comprising a riser ring which is for fastening attachably to the top end of the riser, and one or more cables extending by way of cable pulleys from said vessel or platform to said riser ring, in which said cable pulleys are under such influence or tensioning means that a tensioning force can be applied to the cable, the riser ring being provided with riser ring sheaves and the cables being guided in an outgoing reeving from the vessel or the platform to said riser ring sheaves, and being guided back by way of said riser ring sheaves in a return reeving to said vessel or platform.
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