Method and device for riser tensioning
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United States of America Patent
Stats
-
Mar 23, 2004
Grant Date -
N/A
app pub date -
Jul 3, 2001
filing date -
Sep 25, 1998
priority date (Note) -
In Force
status (Latency Note)
Importance
Abstract
To maintain a riser under tension, the riser can be connected to a gripper (5, 12) which is connected to vertical toothed racks (4) that are in constant engagement with gear wheels (22) which are driven with constant torque, preferably by hydraulic motors (9) at constant pressure. An apparatus is also described for putting the riser under tension. The apparatus includes vertical guides (7) in a derrick, toothed racks (4) in the vertical guides (7), a gripper (5, 12) designed for interaction with a riser connected to the racks (4), and drive units (9) arranged in the derrick for drive-actuation of the racks (4) in the vertical guides (7).
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