Crane vessel

Wind Lift I at the harbor in Emden, Germany

A crane vessel, crane ship or floating crane is a ship with a crane specialized in lifting heavy loads. The largest crane vessels are used for offshore construction. Conventional monohulls are used, but the largest crane vessels are often catamaran or semi-submersible types as they have increased stability. On a sheerleg crane, the crane is fixed and cannot rotate, and the vessel therefore is manoeuvered to place loads.

History

In medieval Europe, crane vessels which could be flexibly deployed in the whole port basin were introduced as early as the 14th century.

During the age of sail, the sheer hulk was used extensively as a floating crane for tasks that required heavy lift. At the time, the heaviest single components of ships were the main masts, and sheer hulks were essential for removing and replacing them, but they were also used for other purposes.

USS Kearsarge as Crane Ship No. 1

In 1920, the 1898-built battleship USS Kearsarge (BB-5) was converted to a crane ship when a crane with a capacity of 250 tons was installed. Later it was renamed Crane Ship No. 1. It was used, amongst other things, to place guns and other heavy items on battle ships under construction. Another remarkable feat was the raising of the USS Squalus (SS-192) in 1939.

In 1942, the Crane Ships aka "Heavy Lift Ships" SS Empire Elgar (PQ16), SS Empire Bard (PQ15), and SS Empire Purcell (PQ16) were sent to the Russian Arctic ports of Archangel, Murmansk and Molotovsk (Since renamed Sererodvinsk). Their role was to enable the unloading of the Arctic convoys where port installations were either destroyed by German bombers or were non existent (as at Bakaritsa quay Archangel).

In 1949, J. Ray McDermott had the Derrick Barge Four built, a barge that was outfitted with a 150 tons revolving crane. The arrival of this type of vessel changed the direction of the offshore construction industry. Instead of constructing oil platforms in parts, jackets and decks could be built onshore as modules. For use in the shallow part of the Gulf of Mexico, the cradle of the offshore industry, these barges sufficed.

In 1963, Heerema converted a Norwegian tanker, the Sunnaas, into a crane vessel with a capacity of 300 tons, the first one in the offshore industry that was ship-shaped. It was renamed Global Adventurer. This type of crane vessel was better adapted to the harsh environment of the North Sea.

SSCV Thialf in Norwegian Fjord

In 1978, Heerema had two semi-submersible crane vessels built, the Hermod and the Balder, each with one 2000 ton and one 3000 ton crane. Later both were upgraded to a higher capacity. This type of crane vessel was much less sensitive to sea swell, so that it was possible to operate on the North Sea during the winter months. The high stability also allowed for heavier lifts than was possible with a monohull. The larger capacity of the cranes reduced the installation time of a platform from a whole season to a few weeks. Inspired by this success similar vessels were built. In 1985 the DB-102 was launched for McDermott, with two cranes with a capacity of 6000 tons each. Micoperi had the M7000 built in 1986 with two cranes of 7000 tons each.

However, in the mid 1980s, the boom in the offshore industry was over, resulting in collaborations. In 1988, a joint venture between Heerema and McDermott was formed, HeereMac. In 1990 Micoperi had to apply for bankruptcy. This enabled Saipem – in the beginning of the 1970s a large heavy lift contractor, but only a small player in this field at the end of the 80s – to take over the M7000 in 1995, later renaming it Saipem 7000. In 1997 Heerema took over the DB-102 from McDermott after discontinuation of their joint venture. The ship was renamed Thialf and, after an upgrade in 2000 to twice 7100 tons, it is now the largest crane vessel in the world even if all the world's lifting records belong to the Saipem 7000 (12150t of Sabratha Deck).

Heavy lift vessels

Vessel	Company	Capacity (t)	Type
Thialf	Heerema Marine Contractors	14,200 (tandem)	Semi-submersible
Saipem 7000	Saipem	14,000 (tandem)	Semi-submersible
Svanen	Van Oord	8,700	Catamaran
Hermod	Heerema Marine Contractors	8,100 (tandem)	Semi-submersible
VB-10,000	Versabar Inc.	7,500	Catamaran
Lan Jing	CNOOC	7,500	Monohull
Balder	Heerema Marine Contractors	6,945 (tandem)	Semi-submersible
Seven Borealis	Subsea 7	5,000	Monohull
Oleg Strashnov	Seaway Heavy Lifting	5,000	Monohull
Swiber Kaizen 4000	Swiber Offshore	4,200	Monohull
Aegir	Heerema Marine Contractors	4,000	Monohull
DB 50	J. Ray McDermott	4,400	Monohull
Rambiz	Scaldis	3,300	Catamaran
Asian Hercules II	Smit International	3,200	Monohull
DB 101	J. Ray McDermott	3,500	Semi-submersible
DB 30	J. Ray McDermott	3,080	Monohull
LTS 3000	L&T-SapuraCrest JV	2,722	Monohull
Sapura 3000	SapuraAcergy	2,722	Monohull
Stanislav Yudin	Seaway Heavy Lifting	2,500	Monohull
Saipem 3000	Saipem	2,177	Monohull
Huasteco	Grupo Protexa	2,000	Monohull
Tolteca	CAMSA	2,000	Monohull
Quippo Prakash	MDL/Quippo/Sapura JV	2,000	Monohull
Left Coast Lifter	Fluor/American Bridge/Granite/Traylor Brothers JV	1,699	Barge

|DLB1600 |Valentine Maritime Gulf |1600 |Monohull |}

See also

• Jackup rig
• List of historical harbour cranes

External links

• A Gigantic Muscle of Steel: it picks up a sunken tugboat from the harbor bottom as easily as you'd lift ten pounds off the floor, Popular Science monthly, February 1919, page 67, Scanned by Google Books