| 摘要 |
A subsea construction with ballast tanks, typically a storage tank (1) for oil, is installed on the seabed by connecting the construction (1) to a buoy (5) and two or more tugboats (3) by means of wires (8) which are attached to the buoy and run from there to pulleys on the construction and on to the tugs. The construction is ballasted until it has a suitable weight, typically 50 tons, and is lowered to a depth at a suitable height above the seabed by paying out wires (8) from winches on the tugs. The construction is lowered the final distance to the seabed by ballasting the construction. <IMAGE> |
