| 摘要 |
A tensioning device ( 15 ) for a riser ( 5 ) connecting a subsea borehole ( 7 ) with a floating installation ( 1 ) on the surface of the sea ( 11 ), where the tensioning device ( 15 ) is provided with telescoping tubes ( 27, 27 ') and also several evenly spaced hydraulic cylinders ( 31, 31 ') arranged in a peripherally encircling manner and mainly in the longitudinal direction of the riser, and where the tension in the riser is exerted through hydraulic pressure in said cylinder ( 31, 31 '), the tensioning device ( 15 ) consisting of two successive, interconnected telescopic tensioning units ( 23, 25 ), the tensioning units ( 23, 25 ) being designed separately to maintain a prescribed tension in the riser ( 5 ).
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