| 摘要 |
<p>A screw jack for levelling a subsea template comprises (a) a guided entry adapted to receive a flat-sided drive shaft, (b) an inner screw adapted to be rotated by the drive shaft, (c) a non-rotatable inner housing, through one end of which the screw is threaded, (d) a non-rotatable outer housing, against one end of which the screw bears, the outer housing being axially moveable relative to the inner, (e) a base against which the inner housing rests and (f) one or more projections on the outer housing adapted to bear against corresponding projections on the template. The arrangement is such that rotation of the drive shaft causes relative axial motion between the inner and outer housings. The jack is suitable for use in diverless systems.</p> |
