Barge Carrier Variants
The SEABARGE (SEABEE) is arranged much differently from the LASH in that it has three decks on which the cargo barges or container flats are stowed. Barges are brought to each deck level by a stern elevator and are moved internally within the ship by the Transporter (conveyor) System. Two barges can be loaded or discharged in a cycle of about 40 minutes. SEABEE barge ships can carry up to 38 sea barges (97'6" long x 35' wide x 16'11" high). The elevator capacity is 2,000 LT. The SEABEE ship is the preferred ship to transport landing craft, utility, and lighter, amphibious resupply, cargo 60 ton. The military advantages of barge carriers include their suitability to carry either unit equipment, sustaining supplies, or ammunition; the ability to carry amphibious lighterage; and the capability to preload the barges before ship arrival and to discharge cargo from the barges at relatively austere port facilities, after the ship has sailed. Their military disadvantages include a complete dependence on a single, very complicated mechanical system for barge discharge; the barge's dependence, once afloat, upon the availability of towage; and the overall unsuitability of the barges for towing outside harbors or other protected waters.
BACO (Barge / Container)
BACO liners (barge/container liners) operate in accordance with the dock principle. In this German-developed system, the barges are floated through bow doors into the carrier, which has been lowered by taking on ballast. The special feature of these maneuvers is that fact that these barges float in the ship's storage area and the ship must open its bow in order for them to float in and out. Empty barges have an empty height of approx. 7 m. The skipper can look straight out over the barges when pushing, which requires sure instinct and driving expertise on the part of the crew for this maneuver. Once the bow doors have been closed, the water is pumped out of the dock and the barges are secured with special fittings. The special BACO barges measure 24 m x 9.50 m and, at a deadweight of 800 metric tons, have a draft of 4.10 m. However, the particular dimensions of the carrier ships are such that other types of barge and even inland waterway vessels and lighters can also be carried. Several tiers of containers can be carried on deck and be loaded and unloaded with on-board lifting gear. The Seereederei Baco-Liner GmbH, based in Duisburg, we run a regular conventional and Container liner service between North-West-European and West-African ports and vice versa. BACO Liner with their unique Barge / Container carrying vessels are considered the No 1 service to West Africa. This system allows the vessels to arrive and discharge midstream in African Ports, thus avoiding port delays.
CONDOCK - the synonym for CON tainer-, DOCK-, and Ro/Ro-vessel features the combined versatility for the marine-transportation of Container, large and heavy loads in the Ro/Ro mode and the wide range of General cargoes. The special design of these vessels is their capability of the safe loading and transportation of floating units by semi-submersible dock-operation or utilization as a mobile Dry Dock. The vessels may trade worldwide with open or removed hatchcovers, resulting in nearly unlimited cargoheights.
Cargo transport ships utilising a so-called float-on cargo-loading principle have been built. In 1978 the CONDOCK-Type vessel was designed in close co-operation with a German Shipyard. The Condock I of 3,603 dwat featured 2 cranes on the starboard side, each 63 tons at 14,00 m combinable 126 tons, decreasing gradually to 2 x 30 tons at 24,00 m outreach. Container capacity was 371 TEU 20?x 8?x 8?6??, hold 128 units 1st tier deck 81 units/2nd/3rd tier ea 75 units + ttl. 12 units deck when cranes topped. The barge capacity was 3 baco / lash. Until 1984, a successive series of almost identical sistervessels were delivered and operated together with further company-owned conventional tonnage in the world-wide freight market. The Condock III is a 4,400 DWT Ro-Ro, Flo-Flo vessel with dual 63 metric ton cranes combinable for 126-ton lifts and an unobstructed hold that is 87.5 meters long. The ship is ideal for yachts, tugboats, and modules and can successfully load at facilities primarily designed for barge operations.
The international track record includes the preparation and transport of sensitive prefabricated high-dimensioned modules and pressure vessels for refineries and offshore plants in the Ro-Ro mode. Further contracts include the transport of former USSR Foxtrot class submarine from Australia to Long Beach and the Dutch sailing- replica BATAVIA from Amsterdam to Sydney and back in the float in/out mode. In 1999 Condock was awarded a long term contract for the transportation of rocket-stages from Ukraine to Long Beach for the Sea-Launch satellite project.
These ships have a self-lowering capability whereby a cargo space can be flooded through the stern to allow direct access of floating cargo (see the article on the container freighter "Condock" in Mak Toplaterne Diesel Engine Journal, November 1980, page 37). By enabling cargo to be floated into the ship, the need for expensive lifting gear is eliminated. After loading the barges onto the transport ship it is debalasted to cause it to rise in the water and the cargo space is drained. The barges then lie in the transport ship as in a dry dock.
The number of barges of a given size which can be docked in a transport ship in this way is dependent on the length and width of the cargo space. In designing the transport ship the extent to which these dimensions can be increased is limited by numerous factors including of course the maximum permissible length and beam of the ship.
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