|Length o.a. 216.79 meters|
|Length b.p. 207.93 meters|
|Breadth moulded / max. 45.00 meters|
|Deck Space (L X B)* 130.00 x 44.50 meters|
|Depth 14.00 meters|
|Draft submerged at FPP / APP 23.00 / 23.00 meters|
|Maximum draft 10.44 meters|
|Water-depth above main deck FPP / APP 9.00 / 9.00 meters|
|Deadweight 53,000 metric tons|
|Speed 14.5 knots|
After nearly two years of engineering, procurement, and project preparations, Dockwise recently completed the first of two float-overs for the Vyborg Project in Korea. The Vyborg Project is big in scope and size: It involves moving two 15,000 metric ton semi-submersible hulls and two topsides that weigh approximately 19,000 metric tons each. These pieces were constructed in locations more than 27,000 km apart and the Dockwise vessel the Black Marlin was used to successfully load the first of two topsides for transport to the float-over location in Korea, to be joined with a hull that was transported from Vyborg, Russia by the Talisman. Dockwise’s scope also included designing and installing the pre-laid anchor spread, hooking the hull to the spread and ballasting the hull to its mating draft. This part involved the use of five tugs, two anchor handlers, one workboat, two anchor barges, one test barge, a crane barge, three launch boats and guard boats.
An especially innovative feature is the “floating float-over” aspect of this project: This float-over was completed without a fixed structure. Instead, a floating structure was anchored and ballasted down to keep it in place while Dockwise performed the float-over operation.
After the Black Marlin docked into the hull, which was ballasted down to 27 meters draft, ballast operations were initiated, in order to lock the Leg Mating Units and align the hull columns and the topside. Next steps included welding the columns to the topside under a partial load transfer, after which they released the load from the Leg Mating Units and began ballast operations to transfer the full load of the topside onto the hull columns. Finally, on July 10, the Black Marlin was retracted from the completed rig and the de-ballasting operations were completed.
The second identical structure was loaded using the same process in October 2010 and successfully installed in November.
Type: Gazflot Moss CS-50 Hull
Weight: 15,000 tons
Length: 118.56 m
Width: 75.2 m (excluding anchors)
Hull anchoring by total 150mT anchors.
Hull ballasting to 27 m draught using 45.000 mT water.
Transportation period #1: April – June 2010
Transportation period #2: October – November 2010
Vessel: m.v. Black Marlin
Type: Gazflot Moss CS-50 Topside