A floating sheerleg (also: shearleg) is a floating water vessel with a crane built on shear legs. Unlike other types of crane vessel, it is not capable of rotating its crane independently of its hull.
There is a huge variety in sheerleg capacity. The smaller cranes start at around 50 tons[ which? ] in lifting capacity, with the largest being able to lift 20,000 tons. The bigger sheerlegs usually have their own propulsion system and have a large accommodation facility on board, while smaller units are floating pontoons that need to be towed to their workplace by tugboats.
Sheerlegs are commonly used for salvaging ships, assistance in shipbuilding, loading and unloading large cargo into ships, and bridge building. They have grown considerably larger over the last decades due to a marked increase in vessel, cargo, and component size (of ships, offshore oil rigs, and other large fabrications), resulting in heavier lifts both during construction and in salvage operations.
Name | Image | Company | Lifting capacity | Country |
---|---|---|---|---|
Pioneering Spirit | Allseas | 20,000 t 22,000 short tons [1] | Switzerland | |
Hyundai-10000 | Hyundai Heavy Industries | 10,000 t 11,000 short tons [2] | Korea | |
Asian Hercules III | Asian Lift (Smit & Keppel FELS) | 5,300 t 5,800 short tons [3] [4] [5] | Singapore | |
HL 5000 | Deep Offshore Technology | 5,000 t 5,500 short tons [6] | Iran | |
海翔 Kaisho | Yorigami Maritime Construction Co., Ltd. | 4,100 t 4,500 short tons [7] | Japan | |
Gulliver | Scaldis | 4,000 t 4,400 short tons [8] | Luxemburg | |
洋翔 Yousho | Yorigami Maritime Construction Co., Ltd. | 4,000 t 4,400 short tons [7] | Japan | |
第50吉田号 Yoshida No.50 | Yoshida-Gumi Co., Ltd. | 3,700 t 4,100 short tons [9] | Japan | |
武蔵 Musashi | Fukada Salvage | 3,700 t 4,100 short tons [10] | Japan | |
L-3601 | Sembcorp Marine | 3,600 t 4,000 short tons [11] | Singapore | |
Rambiz | Scaldis | 3,300 t 3,600 short tons [12] | Belgium | |
Asian Hercules II | Asian Lift (Smit & Keppel FELS) | 3,200 t 3,500 short tons [3] [4] [13] | Singapore | |
富士 Fuji | Fukada Salvage | 3,000 t 3,300 short tons [10] | Japan | |
SADAF 3000 | Darya Fan Qeshm Industries (SADAF) | 3,000 t 3,300 short tons [14] | Iran | |
第28吉田号 Yoshida No.28 | Yoshida-Gumi Co., Ltd. | 3,000 t 3,300 short tons [15] | Japan | |
Name | Image | Company | Lifting capacity | Country |
HEBO-Lift 10 | HEBO Martitiemservice B.V. | 2,200 t 2,400 short tons [lower-alpha 1] [4] | Netherlands | |
駿河 Suruga | Fukada Salvage | 2,200 t 2,400 short tons [10] | Japan | |
金剛 Kongo | Fukada Salvage | 2,050 t 2,260 short tons [10] | Japan | |
Matador 3 | Bonn & Mees | 1,800 t 2,000 short tons [17] | Netherlands | |
Left Coast Lifter | Tappan Zee Constructors | 1,699 t 1,873 short tons [18] | United States | |
Asian Hercules | Asian Lift (Smit & Keppel FELS) | 1,600 t 1,800 short tons [3] [4] [19] | Singapore | |
PW L-1501 | Pacific Workboats Pte Ltd | 1,500 t 1,700 short tons [20] | Singapore | |
Lifter 1 | Saipem | 1400 ton | Malta | |
新建隆 Shin-kenryu | Yorigami Maritime Construction Co., Ltd. | 1,400 t 1,500 short tons [7] | Japan | |
新柏鵬 Shin-hakuho | Yorigami Maritime Construction Co | 1,300 t 1,400 short tons [21] | Japan | |
Taklift 6 [lower-alpha 2] | Asian Lift (Smit & Keppel FELS) | 1,200 t 1,300 short tons [4] | Singapore | |
Taklift 7 | Smit Internationale | 1,200 t 1,300 short tons [4] | Netherlands | |
Italia | Fratelli Neri | 1,000 t 1,100 short tons [22] | Italy | |
Smit Cyclone | Asian Lift (Smit & Keppel FELS) | 1,000 t 1,100 short tons [23] | Bahamas | |
Name | Image | Company | Lifting capacity | Country |
Chesapeake 1000 | Donjon Marine | 910 t 1,000 short tons [24] | United States | |
HEBO Lift 9 [lower-alpha 3] | 900 t 990 short tons [25] | Denmark | ||
Brabo | Antwerp Port Authority | 800 t 880 short tons [26] | Belgium | |
Zahariy LR-800 | Kuznia na rubalskomu ship building | 800-850t 900 short tons | Ukraine | |
Taklift 1 | Smit Internationale | 800 t 880 short tons [23] | Netherlands | |
PW L-801 | Pacific Workboats Pte Ltd | 800 t 880 short tons [20] | Singapore | |
Uglen | J. J. Ugland | 800 t 880 short tons [27] | Norway | |
伊豆 Izu | Fukada Salvage | 700 t 770 short tons [10] | Japan | |
大和 Yamato | Fukada Salvage | 700 t 770 short tons [10] | Japan | |
宏栄号 Koei-go | Fukada Salvage | 600 t 660 short tons [10] | Japan | |
Enak | Port of Hamburg [lower-alpha 4] | 600 t 660 short tons [28] [29] | Germany | |
Cormorant | Multraship Towage and Salvage B.V. | 600 t [30] | Netherlands | |
Name | Image | Company | Lifting capacity | Country |
RMG 500 | Resolve Salvage & Fire | 500 t 550 short tons [31] | Singapore | |
SBG Himmat | Arihant Ship Breakers | 450 t 500 short tons [32] | India | |
Norma | Scaldis | 440 t 490 short tons [33] | Belgium | |
Asian Helping Hand III | Asian Lift (Smit & Keppel FELS) | 400 t 440 short tons [3] [34] | Singapore | |
Consul | Tenwolde Transport en Repair | 400 t 440 short tons [35] | Netherlands | |
Tronds Lift 7 | Tronds Marine | 400 t 440 short tons [36] | Norway | |
Tronds Lift 8 | Tronds Marine | 400 t 440 short tons [36] | Norway | |
Matador | Bonn & Mees | 400 t 440 short tons [17] | Netherlands | |
Matador 2 | Bonn & Mees | 400 t 440 short tons [17] | Netherlands | |
Smit Typhoon | Asian Lift (Smit & Keppel FELS) | 400 t 440 short tons [37] | Bahamas | |
HEBO-Lift 7 | HEBO Maritiemservice B.V. | 300 t 330 short tons [38] | Netherlands | |
Floating Crane No. 303 | Fukada Salvage | 300 t 330 short tons [39] | Japan | |
Triton | Wagenborg Towage | 300 t 330 short tons [40] | Netherlands / Germany |
Smit Internationale N.V. is a Dutch company operating in the maritime sector. The company was founded in 1842 by Fop Smit as a towage company with only the 140 horsepower paddle steamer tug Kinderdijk. Fop's sons, Jan and Leendert, continued the company under the name L. Smit & Co and expanded the fleet. In 1870, they began using tugs with propellers. After a merger in 1923 with Internationale Sleepdienst, the name was changed to "L. Smit & Co.'s Internationale Sleepdienst". Formerly listed at the NYSE Euronext stock exchange in Amsterdam, the company was fully acquired by Royal Boskalis Westminster in 2010.
DCV Balder is a deepwater construction vessel (DCV) operated by Heerema Marine Contractors.
USNS Salvor (T-ARS-52) is a Safeguard-class rescue and salvage ship, the second United States Navy ship of that name.
A crane vessel, crane ship, crane barge, or floating crane is a ship with a crane specialized in lifting heavy loads, typically exceeding 1,500 t for modern ships. The largest crane vessels are used for offshore construction.
Mighty Servant 3 is a 27,000-ton semi-submersible heavy lift ship. Its deck is 40 by 140 m. The vessel was built in 1984 by Oshima Shipbuilding Co. Ltd. in Ōshima, Japan, for Dutch shipping firm Wijsmuller Transport, which merged in 1993 with Dock Express Shipping to become Breda-based offshore heavy lifting group Dockwise Shipping B.V.
Pioneering Spirit is a catamaran crane vessel owned by the Switzerland-based Allseas Group designed for the single-lift installation and removal of large oil and gas platforms and the installation of record-weight pipelines. The 382-metre-long (1,253 ft), 124-metre-wide (407 ft) vessel is the world's largest vessel by gross tonnage, the heaviest vehicle ever made and since September 2021 also the largest floating sheerleg in the world. It was built in South Korea by Daewoo Shipbuilding & Marine Engineering in 2013 at a cost of €2.6 billion. It commenced offshore operations in August 2016.
Shear legs, also known as sheers, shears, or sheer legs, are a form of two-legged lifting device. Shear legs may be permanent, formed of a solid A-frame and supports, as commonly seen on land and the floating sheerleg, or temporary, as aboard a vessel lacking a fixed crane or derrick.
GSF Explorer, formerly USNS Hughes Glomar Explorer (T-AG-193), was a deep-sea drillship platform built for Project Azorian, the secret 1974 effort by the United States Central Intelligence Agency's Special Activities Division to recover the Soviet submarine K-129.
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Left Coast Lifter is a floating derrick barge or sheerleg which was built to assist in the eastern span replacement of the San Francisco–Oakland Bay Bridge. The barge carries a shear legs crane which is the largest barge crane ever used on the U.S. West Coast. The barge's name is taken from "Left Coast", a slang phrase that plays on the fact that the U.S. West Coast is on the left of the United States when viewing a map with north oriented at the top.
BOKA Vanguard is a semisubmersible heavy-lift ship owned and operated by Dockwise B.V. Dockwise Vanguard is the largest vessel of her type ever built, and is able to carry cargoes up to 110,000 tonnes. Dockwise Vanguard was designed to move offshore oil and gas facilities, but can also carry other ships and act as an offshore dry-dock facility.
STV Astrid was a 41.90-metre long tall ship that was built in 1918 in the Netherlands as a lugger and originally named W.U.T.A., short for Wacht Uw Tijd Af meaning "Bide Your Time". She was later transferred to Swedish ownership, renamed Astrid and sailed on the Baltic Sea until 1975. She then sailed under a Lebanese flag and was allegedly used for drug smuggling. After being found burnt out on the coast of England in the early 1980s, she was overhauled and used as a sailing training vessel. She was based in Weymouth, Dorset, United Kingdom and was informally known as "Weymouth's vessel".
Weeks 533 is a 500-short-ton (454 t) capacity Clyde Iron Works model 52 barge-mounted crane which is the largest revolving floating crane on the East Coast of the United States. It was originally ordered for bridge construction and has since been used in several notable heavy lifts.
Asian Hercules II is a floating sheerleg crane vessel owned and operated by Asian Lift.
Titan, better known by its former nickname Herman the German, is a large floating crane currently serving in the Panama Canal performing heavy lifts for lock maintenance. Prior to its move to Panama in 1996, the crane was based at the Long Beach Naval Shipyard from the end of World War II until the yard's closure in 1995. It was seized from the German Kriegsmarine following the end of World War II as part of war reparations. The crane was built by Demag Cranes AG as Schwimmkran nr. 1 in 1941 for the Kriegsmarine, where it had served in the Baltic Sea tending German U-boats. MMSI number: 374940000
Ajax is a floating crane built to move and install the canal locks and other large parts of the Panama canal. Ajax also helped in ship repairs and clearing the canal as needed. Ajax and her identical sister crane, the Hercules, were the largest floating cranes at time of completion, able to install the massive Panama Canal locks. Ajax could lift a maximum of 250 tons to a height of 21 feet (6.40 m), with a close reach. At Ajax's far reach she could lift a maximum of 100 tons. Ajax and Hercules were built by Deutsche Maschinenbau AG (1910-1977) . After the Ajax and Hercules, Deutsche Maschinenbau AG later made the Langer Heinrich, or Long Henry in 1915, in use for 100 years.
The Govan-Partick Bridge is a new bridge under construction in Glasgow, Scotland, across the River Clyde, close to the Riverside Museum. To allow ships past, its swing bridge main span can rotate to align with the south shore.
Clark Ádám is a crane vessel, specifically a floating sheerleg, built in 1980 in Budapest, Hungary, by the Hungarian Shipyards and Crane Factory Angyalföld Division. It originally had a lifting capacity of 120 metric tons, gradually raised to 200 tons by 2006, making it one of the largest in lifting capacity on Central European rivers. It is mainly used for building bridges, but is also commissioned to assist salvage operations, as well as to launch hydrofoils. It has rescued several ships; in 2019 it raised the sunken Hableány from the Danube at Budapest. The vessel is named after Scottish engineer Adam Clark (1811–1866).
SSCV Sleipnir is a semi-submersible crane vessel (SSCV) owned and operated by Heerema Marine Contractors. It is named for Sleipnir, the eight-legged horse ridden by Odin in Norse mythology. The vessel is equipped with two revolving cranes built by Huisman Equipment B.V., each with a capacity of 10,000 t ; the main cranes can be operated in tandem to jointly lift 20,000 t. It was ordered in 2015 and built in Singapore by Sembcorp Marine. After its completion in 2019, SSCV Sleipnir succeeded Heerema's earlier SSCV Thialf as the largest crane vessel in the world.
Chesapeake 1000 is a heavy lift sheerleg crane ship, owned by Donjon Marine Co., capable of lifting 1,000 short tons. Despite claims it is the largest boomable stiff-leg-derrick barge on the eastern seaboard of the United States, Left Coast Lifter, which was used for the assembly of the replacement Tappan Zee Bridge, can lift nearly double the capacity.
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