| 摘要 |
A method for transporting and installing a heavy subsea structure such as a subsea processing centre (10) for produced crude oil or natural gas. The method comprises: controlledly flooding at least one ballast tank (52) attached to or incorporated into the structure, to the extent that the structure becomes negatively buoyant at a predetermined towing depth; towing the negatively-buoyant structure at the towing depth by the Controlled Depth Towing Method (CDTM); and, after towing to the installation location, further flooding the ballast tank to lower the structure onto the seabed (64). At the seabed, a fluid transportation pipe (90) of a subsea production installation may be coupled to pipework of the structure. |
