WorldyardsShiptype Definitions1. Bulkers1(1) VLOC aVery Large Ore Carriers, or bulkers with 200,000 dwt and above, typically purpose-designed for carriage of iron ore, onlywith much smaller cargo cubic capacity than conventional bulkcarriers.dwt 1(2) Capesize Bulkers between 120,000 - 199,999 dwt dwt1(3) Handy-cape Bulkers with dwt <= 119,999 and breadth > 39.5m. They are alternatively known as “mini-cape”. dwt1(4) Post Panamax bulkers Bulkers between 50,000 to 110,500 dwt, and breadth >32.31m and <= 39m.dwt 1(5) Panamax bulkers Bulkers between 55,000 - 84,999 dwt, and breadth <= 32.31mand loa >= 200 m. The ships with 229m loa are called Kamsarmax, being compatible with the Port Kamsar bauxiteloading terminal, Guinea.dwt 1(6) Baby-Panamax bulkers Bulkers between 50,000 - 54,999 dwt and breadth <= 32.31m and loa >= 200 mdwt 1(7) Supramax Bulkers between 50,000 - 64,999 dwt, and breadth <= 32.31m and loa < 200mdwt 1(8)Handymax b Bulkers with dwt 40,000 - 49,999 dwt 1(9)Handysize Bulkers with dwt 10,000 - 39,999 dwt 1(10) Bulker < 10000dwtBulker with dwt < 10,000 dwt 1(11) Self-dischargingbulkers Ships that are able to discharge their cargo independently of shore side equipment by way of a gravity or top discharge system permanently installed in the holds, containing varioustypes of loose dry cargo of a homogeneous nature.dwt 1(12) Woodchip carriers Woodchips carriers generally have six holds to carrywoodchips in bulk. These bulk carriers are box-hold squarebottom vessels with wide hatches. Vessel sizes are typically40,000 dwt to 50,000 dwt, while capacity is measured inmillion cubic feet. A standard size is usually 3.6m cbmequating to 47,000 dwt. Because of their low specific gravity,woodchips require a relatively large hold capacity. Cargohandling equipment includes an unloading system measuredin tonnes per hour. cbftNotes :a. VLOCs - they are not bulk carriers from a construction point of view (hence they do not need to comply with CSR rules) but from a trading point of view we are classifying them as bulk carriers.b. Open-hatch bulkers are included here.They are a kind of bulk carriers which are always double sided with extra wide hatches and they have box shaped holds.2. Containers2(1) Containerships >10,000teuPure (fully cellular) containerships >= 10,000 teu teu2(2) Containerships 7,000 –9,999 teuPure (fully cellular) containerships between 7,000 -9,999 teuteu2(3)Post-panamaxContainerships < 7,000 teuPure (fully cellular) containerships with breadth >32.31m and < 7,000 teuteu2(4) Panamax Containerships >4,000 teuPure (fully cellular) containerships with breadth < =32.31m, and > 4,000 teu and < = 6,999 teuteu2(5) Containerships 3,000 –4,000 teuPure (fully cellular) containerships between 3,000 –4,000 teuteu2(6) Containerships 2,000 –2,999 teuPure (fully cellular) containerships between 2,000 –2,999 teuteu2(7) Containerships teu 1,500 -1,999 teuPure (fully cellular) containerships with breadth < =32.31m, and between 1,500 - 1,999 teuteu2(8) Containerships teu 1,000 -1,499 teuPure (fully cellular) containerships with breadth < =32.31m, and between 1,000 - 1,499 teuteu2(9) Containerships teu 500 -999 teuPure (fully cellular) containerships between 500 – 999teuteu2(10) Containerships < 500 teu Pure (fully cellular) containerships with teu < 500 teu teu3. Semi-liner tonnage3(1) MPP General cargo ships that carry a wide variety of cargoes, including industrial items, bagged cargoes, project cargoes, steel products, forest products, palletized cargoes, various break-bulk cargoes andcontainers. They are unicellular and have holds with hoistable tween decks. Some have refrigerated cargo spaces for the carriage ofperishable cargoes. They have additional cargo handling to and fromthe cargo spaces by way of a side loading / unloading system (for the carriage of cargo in pallet form and other unitized cargo).dwt3(2)MPPHeavy liftMPP vessels with cargo cranes capable of lifting 100mt and abovesingly. They are unicellular and typically with more than one deck.dwt3(3) ConbulkersVessel designed to carry bulk cargoes, minor bulk cargoes (forest products, aluminium etc.) and containers. They typically have container holds and bulk holds. Container holds are fitted with cellguides whilst bulkholds are fitted either with container sockets orequipped with fittings (twistlocks and lashing rod) to secure containersin block stowage. Container holds typically have lift on/lift off pontoon hatchcovers whilst block holds have hydraulic hinged covers. Feedersockets are also provided for containersdwt3(4)RoRocontainersThe Roro Containerships (or ConRo vessels) are a hybrid between aRoRo and a container ship. This type of a vessel has a below-deckarea used for vehicle storage while stacking containers on theweather deck.dwt4. LNG (Gas I)4(1) Conventional Liquified Natural Gas carriers. Vessels equipped withinsulated cargo tanks to carry natural gas in its liquid state at a temperature of -162 degrees Celsius. There arecurrently two main types of containment systems: Mossand Membrane.(Other types of containment systemsexisting are SPB, pressurized and cylindrical. However,these systems are not currently being built).cbm4(2) LNGRV LNG Vessel Re-gasification Unit - A LNG ship with anonboard Re-gasification plant allowing it to discharge cargodirectly into a gas pipeline system. This type of vessel canalso be used as a conventional LNG ship. Regasificationsystems can also be retrofitted to existing ships.cbm4 (3) LNGRL Re-liquefaction LNG vessel - A LNG ship that is installedwith a re-liquefaction plant allowing it to re-liquefy boil-off gas and re-inject into the cargo tanks. Liquefactionsystems can either be retrofitted to existing ships orinstalled on new buildings.cbm5. CNG (Gas II)5(1) CNG Compressed Natural Gas (CNG) Carrier - An alternativegas transportation method that fits between pipelines and LNG. As the name suggests, natural gas is kept in agaseous state during the transportation process. Ratherthan liquefaction of gas into LNG, the CNG system useshigh pressure in a standard steel containment structure.The containment system is especially suited to shortdistance routes.cbm6. LPG (Gas III)6(1) VLGC Very Large Gas Carriers are LPG tankers with a carryingcapacity of 60,000 cbm or more. LPG tankers designed to carrypropane, butane or a mixture of the two, ammonia as well asother clean petroleum products (naphtha and jet fuel). Thesevessels are fully refrigerated.cbm 6(2) LGC Large Gas Carriers - LPG Tankers between 45,000 - 59,999 cbm(typically 50,000 – 59,999 cbm). These vessels are fullyrefrigerated.cbm 6(3) MGC Medium Gas Carriers - LPG Tankers between 30,000 – 44,999cbm (typically 30,000 – 40,000 cbm). These vessels are fullyrefrigerated.cbm 6(4)LPG 20,000 – 29,999 cbm LPG Tankers between 20,000 - 29,999 cbm. They can be either semi-refrigerated, or ethylene carriers, or fully refrigerated cbm 6(5)LPG 10,000 – 19,999 cbm LPG Tankers between 10,000 - 19,999 cbm. They can be either semi-refrigerated, or ethylene carriers, or pressurized.. cbm 6(6) LPG < 9,999cbmLPG Tankers between < 9,999 cbm. They can be either semi-refrigerated, or ethylene carriers, or pressurized. cbm 6(7) AmmoniaCarriers Gas tankers specially designed for carrying NH3 (Ammonia) cbm7. Combination Carriers7(1) OBO Ore Bulk Oilers are combination carriers designed to carry oil on one voyage leg and, then alternate to ore on the other leg. Fitted with large holds and gas and oil-tight hatchcovers.dwt 7(2) PROBO PROBO (product/ore/bulk/oil) is a kind of combinationcarrier that can carry crude oil and petroleum products aswell as bulk and ore cargoes.dwt 7(3) VLOO Very Large Ore Oilers are combination carriers with a deadweight > 200,000 dwt dwt8. Crude Tankers8(1) ULCC Ultra Large Crude Carriers, or tankers with dwt > 320,000.dwt 8(2) VLCCVery Large Crude Carriers, or tankers with dwt between200,000 – 319,999. dwt8(3) SuezmaxTankers with dwt between 120,000 - 199,999. dwt 8(4)Aframax tankers uncoated Tankers with breadth >32.31m and with dwt between 85,000 – 119,999 and not coated. dwt 8(5)Post panamax tankers uncoated Tankers with dwt 64,999 – 84,999 dwt and Breadth > 32.31m and not coated. dwt 8(6)Panamax tankers uncoated Tankers with dwt 60,000 – 84,999 dwt (typically less than 79,999) and Breadth <= 32.31m and not coated. dwt 8(7) Other crudetankers Tankers without imo class and with dwt < 59,999 and notcoated.dwt9. Product Tankers9(1) LR II“Long Range II” tankers can take 3 lots of 25,000mt naphthacargoes, with dwt 80,000 - 119,999 dwt and coated. dwt 9(2) LR I “Long Range I” tankers can take 2 lots of 25,000mt naphthacargoes, with between 60,000 – 79,999 dwt and breadth <=32.31m and coated.dwt 9(3) MRMedium Range, or tankers between 35,000 – 59,999 dwt without IMO notation and coated. dwt 9(4)Product 20,000 - 34,999 dwt Tankers between 20,000 - 34,999 dwt, without IMO notation and coated. dwt 9(5)Product 10,000 – 19,999 dwt Tankers between 10,000 - 19,999 dwt without IMO notation and coated. dwt 9(6)Product 5,000 - 9,999 dwt Tankers between 5,000 – 9,999 dwt without IMO notation and coated. dwt 9(7) Product0 – 4,999 dwt Tankers between 0 – 4,999 dwt without IMO notation and coated. dwt10. Product/Chemical Tankers10(1) MR/Chemical Tankers 35,000 – 59,000 dwt with IMO 3 notation and/or IMO 2, < 7 grades, and coated dwt10(2) Product/Chemical20,000 - 34,999 dwtTankers with IMO 3 notation and/or IMO 2, < 7 grades, between 20,000 – 34,999 dwt, either coated or stainless steel dwt 10(3) Product/Chemical10,000 – 19,999 dwtTankers with IMO 3 notation and/or IMO 2, < 7 grades, between 10,000 – 19,999 dwt, either coated or stainless steel dwt 10(4) Product/Chemical5,000 - 9,999 dwt Tankers with IMO 3 notation and/or IMO 2, < 7 grades, between 5,000 – 9,999 dwt, either coated or stainlesssteel dwt10(5) Product/Chemical0 - 4,999 dwtTankers with IMO 3 notation and/or IMO 2, < 7 grades,between 0,000 – 4,999 dwt, either coated or stainlesssteeldwt11. Chemical Tankers11(1)Chemical40,000 – 60,000dwtTankers with IMO 2 notation and/or IMO 1, >= 7 grades,between 40,000 – 60,000 dwt, either coated or stainlesssteeldwt11(2)Chemical20,000-39,999dwtTankers with IMO 2 notation and/or IMO 1, >= 7 grades,between 20,000 – 39,999 dwt, either coated or stainlesssteeldwt11(3)Chemical10,000 - 19,999dwtTankers with IMO 2 notation and/or IMO 1, >= 7 grades,between 10,000 – 19,999 dwt, either coated or stainlesssteeldwt11(4) Chemical 5,000- 9,999 dwtTankers with IMO 2 notation and/or IMO 1, >= 7 grades,between 5,000 – 9,999 dwt, either coated or stainlesssteeldwt11(5)Chemical0 - 4,999 dwtTankers with IMO 2 notation and/or IMO 1, >= 7 grades,between 0 – 4,999 dwt, either coated or stainless steeldwt11(6) Other chemicaltankersTankers with IMO 2 notation and/or IMO 1, and stainlesssteel, and < 7 gradesdwt12. Specialised Tankers12(1) Asphalt/BitumenTankersTankers carrying Asphalt/Bitumen with high heatingrequirements (135c)dwt12(2)OtherSpecialisedTankersTankers that do not fall into the other tanker categories;such as wine/juice/water carriersdwt13. Specialised cargo (Specialised cargo I)13(1) Cementcarriers Vessels that are specifically designed to carry cement indry bulk form. Also, they are equipped with specialisedcargo loading/discharging systems which are eithermechanical or pneumatic.dwt13(2) Wagon carriers Also known as ‘Train Wagon Carriers’ or ‘RailFerries’, are a type of RoRo ship fitted with rail tracks.Ships of this category often include hydraulic elevatorplatforms serving multiple decks. Rail wagons are oftenloaded by shore locomotives but shifted on board bydevices called “shunters.” Vessels of this type aregenerally configured to accommodate up to fifty 12 m longrail wagons each weighing up to 100 tonnes. Upper rangeof deadweight is typically 5,000 dwt.No of wagons 13(3) Reefers Refrigerated ships that are designed to carry goodsrequiring refrigeration, such as meat, fish, fruits and dairyproducts. A reefer ship has insulated holds into which coldair is passed at the temperature appropriate to the goods being carried. Reinforced decks allow for forklifts to handlepalletised cargoes. Depending on whether containers arecarried, these ships generally have light cargo gear ofabout 5 tonnes for lifting pallets.cbft 13(4) RoRo Cargo A specialised vessel type fitted with stern, side or bow door with all decks served by ramps.lane metres 13(5) RoLo A hybrid, specialised vessel type with ramps servingvehicle decks but with other cargo decks accessible onlyby cranes. lane metres 13(6) Other specialised cargo All specialised cargo ships (such as livestock carriers, limestone carriers) that does not fit into the above types gt14. Vehicle Carriers (specialized cargo II)14(1) PCC Pure Car Carriers (PCC) are RoRo vessels specially designed for carrying automobiles, and other small wheeled units. Equipped with ramps and multiple decks ofwhich some are moveable.no of cars 14(2) PCTC Pure Car & Truck Carriers (PCTC) are RoRo vesselsspecially designed for carrying automobiles, trucks, and other rolling stock. Equipped with ramps and multipledecks of which some are moveable. no of cars15. Heavy-Lift Cargo (specialized cargo III)15(1) Semi-submersibles Also called Flo-Flo (for float-on/float-off) Vessels used to transportheavyweight unitized cargo - they are shallow drafted ships thatare designed to take in ballast water and submerge their decksbeneath the project, offshore equipment or other cargoes ,andthen raise the cargo above the water level and transport the cargo.Those with fully encircled hulls are called dockships, whilst thereare also open-deck vessels. dwt15(2) Non-submersibles Vessels that can handle heavy-lifts of generally above 1,000 mtwith cranes or via a roro access. These vessels have significantballasting requirements. dwt15(3) Lash ships LASH, an acronym for Lighter Aboard SHip vessels, carry about82/84 LASH barges on board. Barges are being loaded/unloaded by a 500mt lash gantry crane. The bridge is typically locatedforward. They can carry containers as well. dwt16. Passenger ships16(1) Passenger Vessels designed for transporting passengers only. Short-sea passenger ships have limited cabin accommodation, while in the cruise market, each passenger is allocated acabin or berth.no of pax 16(2) Pax ferry Roro vessels designed for transporting both people andvehicles on short sea routes. no of pax16(3) Ro-Pax Roro vessels primarily designed for transporting trucks ortrailers on short sea routes but with additional facilities for the carriage of passengers / drivers of vehicles, sometimeswith cabin accommodation. no of pax/ lane metres17. Fishing Vessels17(1) Trawlers Fishing vessels with trawl gallows for side trawl net fishing or a stern ramp and trawl gallows for stern trawl net fishing. dwt17(2) Purse Seine Fishing Vessel designed for fish catching operations other than that of trawling. dwt17(3) Fish Factory Ships Vessel specially designed for the processing of fish caught by other ships. dwt17(4) Other Fishing Fishing support, fish carrier, whale-catcher.dwt18. Offshore18(1) FPSO Floating Production Storage Oil processing (FPSO) are installed in offshore oilfields and partially process crude oil in their topside equipment. Floating storage offloading (FSO) units are similar, but have storage and pumping equipment only. barrelsstorage18(2) FSO Floating storage offloading (FSO) units are similar to FPSO, but have storage and pumping equipment only.barrelsstorage18(3) LPGFSO Floating storage offloading (FSO) units that have storage andpumping equipment for handling LPG.cbm18(4) FDPSOFPDSOs have identical functions to FPSOs, but are alsoequipped with drilling capabilities which is represented by theletter ‘D’, incorporating the drilling capabilities through a moonpool in their ship-shaped hulls.barrelsStorage18(5) FSU Floating storage unloading (FSU) units are equivalent to FSOs. barrels Storage18(6) LNG-FSRULiquified Natural Gas – Floating Storage Regasification Unitsare offshore structures permanently anchored and performingstorage and regassification processes on board. The FSRU willalso receive LNG from ships. After regassification, the naturalgas will be transported to shore via a constructed pipelinesystemcbm18(7) LNG-FRULiquified Natural Gas – Floating Regasification Units are offshore structures permanently anchored and performing regassification, but not storage, on board. The FSU will alsoreceive LNG from LNG carriers. After regassification, the naturalgas will be transported directly, without storage, to shore via aconstructed pipeline system.cbm18(8) Tugs Vessels that are used in either deep sea towing, salvage orharbour work to tow and manoeuvre large vessels.bollard pull18(9) AHT Anchor Handling Tugs - anchors and tows drilling vessels,lighters and similar craft particularly in offshore.bollard pull18(10) AHTSAnchor Handling Tug Supply - combined offshore supplyvessels and anchor-handling ships. Some vessels also havesalvage capabilities such and fire fighting equipment.bollard pull18(11) PSVPlatform Support Vessels - vessels that serve permanently positioned oil rigs by delivering staff, food, equipment and wasteremoval.gt18(12) ShuttleTankersA ship type in the offshore sector that has emerged since oilexploration went offshore and into deeper and more remotewaters, where pipelines to shore are neither feasible noreconomical. They station themselves on an offshore loadingbuoy and load their cargo of crude oil directly from the oilfield,where it has been kept in a reservoir with perhaps the sulphurremoved. Shuttle tankers need to be very much moremaneuverable than comparable conventional crude carriers,which depend heavily on tugs to help them on and off theirberths. Many shuttle tankers have been converted fromconventional crude ships, with the addition of bow hose handlingequipment and powerful lateral thrusters. They can beimmediately distinguished from other tankers by the high bowcompartment for hose handling. More sophisticated and purposebuilt shuttle tankers may incorporate dynamic positioningequipment, in which up to four thrusters and twin controllablepitch propellers along with flap rudders may be co-coordinatedtogether to maintain the ship precisely over a single point on thesea bottom. Typically, a shuttle tanker is about 120,000 tonnescargo handling capacity and sometimes faster in service speedthan her conventional sister.dwt18(13) Drillships Self-propelled exploration vessels able to combine the features of a survey vessel and an oil rig. These ships are able toaccommodate a high number of personnel and maintain theirpositions up to weeks at a time.water depth18(14)Semi-submersiblerigsFloating offshore drilling units that have pontoons and columnsthat when flooded cause the unit to submerge in the water to apredetermined depth. These units have living quarters, storagespace, on the main deck and dynamically positioned over thesite, or anchored. In shallow water, some semi-submersiblescan be ballasted to rest on the seabed. Semi-submersibles aremore stable than drill ships and ship-shaped barges and areused extensively to drill wildcat wells in rough waters such asthe North Sea.tonne18(15) Jack up rigsMobile bottom-supported offshore drilling structures withcolumnar or open-truss legs that support the deck andhull. When positioned over the drilling site, the bottoms of thelegs rest on the seafloor. Once the legs are firmly positioned onthe bottom, the deck and hull height are adjusted and leveled.water depth18(16) Pipe-layingVesselsPipe-laying vessels are similar to cable-laying vessels, in factsome are dual purpose and can lay either. Pipes are eitherloaded onboard in sections and joined onboard the vessel priorto laying or else by prefabricating the entire whole pipe.water depth18(17) Other offshore Offshore vessels that do not fall into the above categories, suchas survey ship, seismic vessels and crane barges (also known as floating sheerlegs) which serve the oil industry.gt19. Barges19(1) Dumb Flat bottomed vessel without propulsion that works incanals, rivers and coastal areas.dwt19(2) Selfpropelled Flat bottom vessel with own propulsion that works incanals, rivers and coastal areas.dwtNote : According to OECD the CGT rules do not apply to offshore structures except when structures are built in a way that meet the IMO’s rules for ships, in which case they can be considered NCCVs(non cargo carrying vessels).20. Dredgers20 (1) Backhoe/DipperDredgersA backhoe/dipper dredge has a backhoe like excavators. Acrude but usable backhoe dredger can be made by mounting aland-type backhoe excavator on a pontoon.cubic20(2)BucketDredgersA bucket dredger is a dredger equipped with a bucket dredge,which is a device that picks up sediment by mechanical means,often with many buckets attached to a wheel or chain. Somebucket dredgers and grab dredgers are powerful enough to ripout coral reef to make a shipping channel.cubic20(3) Cutter SuctiondredgersMost cutter suction dredgers are stationary, which means theyhave to be towed to their work site by tugboats. Once inposition, so-called spud poles keep the cutter dredger in place.The cutter head, which is mounted on the far end of the cutterladder, is lowered to the seabed with the help of winches. Theturning cutter head cuts into the soil as it is pulled across thebottom horizontally. The loose material is dredged up andpumped to its destination through a floating pipeline. Cuttersuction dredgers are pre-eminently suitable to dredge out hardsoil or to pump up large amounts of sand in shallow water.kw20(4) DustpanDredgersDustpan dredgers are only suitable for use on flat bottoms withthin layers of silt. In order to minimize turbidity the use of jettingwater is not recommended, but jetting water is required to drawin the silt over the full breadth of the suction mouth. Positioningin the vertical plane is good, while positioning in the horizontalplane is moderate, depending on the anchoring system. Thistype of dredger is not suitable for cohesive materials like clay.cubic20(5) Grab / ClamdredgersA grab dredger picks up seabed material with a clamshell grab,which hangs from an onboard crane, or is carried by ahydraulic arm, or is mounted like on a dragline. This techniqueis often used in excavation of bay mud.cubic20(6) Water injectiondredgersThe most prominent feature of a water injection dredger is itslong injection beam underneath the vessel. Through thisinjection beam, large quantities of water are injected into thebottom under low pressure. The thus created sand-and-watermixture flows away to the sides under the influence of gravity.And the result is the intended trench in the bottom. Waterinjection dredging is a cost efficient way to carry outmaintenance dredging in silted up navigation channels andports. The technology is the successful result of research andproduct innovation, in a joint effort of Van Oord and DelftHydraulics.cubic20(7)SuctiondredgersA stationary dredger used to mine for sand. The suction pipe ispushed vertically into a sand deposit. If necessary water jetshelp to bring the sand up. It is loaded into barges or pumpedvia pipeline directly to the reclamation area.cubic20(8) Trailing SuctionHopperDredgersA trailing suction hopper dredger is a large ocean-going vessel.In order to start dredging, the ship reduces its speed to some 1to 2 knots and then lowers the suction pipes on both sides ofthe ship all the way to the seabed. Sand pumps transfer thesand dredged up by the suction head into the hold or hopper.The excess water is drained off via the overflow pipes. Whenthe hopper is full, the ship sails to its destination, thereclamation area. There it unloads its cargo in one of thefollowing manners:cubica) pump the sand through a pipeline when the dump site is atsome distance;b) unload the sand through the bottom doors when in deeperwater;c) rainbowing, through a spout on the bow, when the ship isable to come close to the site.Trailing suction hopper dredgers are able to transport largeamounts of sand over long distances.20(9) Misc dredgers Includes miscellaneous types of dredgers not covered above including Underwater plough, etc cubic21. Service / Miscellaneous Vessels21(1) Ice Breakers A special purpose vessel designed to move and navigate through ice-covered waters. They break the ice and make a path for theother ships to navigate through the ice.gt 21(2) Cable-laying Vessels A specialised group of vessels characterised by sheaves andgantries at the bow and stern. There are also cranes for lowering an ROV (remotely operated vehicles). The cables are used fortelecommunications or high voltage power transmission. gt 21(3) Research Vessel These are vessels dedicated to various types of research at sea, including by not limited to oceanographic, meteorological, seismic, etc.gt 21(4) Training Vessel These are vessels that are dedicated for training seafarers in either in an anchored or sailing status.gt 21(5) Crane Vessel Crane vessels have hulls that are solely designed to carry anonboard crane/cranes specialised in lifting heavy loads. The larger vessels are often semi-submersibles, but conventionalmonohulls also exist.crane capacity 21(6) Lakes-onlyVessels Not ocean-going vessels, specially designed for the Great Lakes area. dwt21(7) Landing Craft Vessels designed with a single deck hull and to run on to abeach or a shore ramp prior to the loading/unloading of roadvehicles, and other cargo by way of wheeled transportdwt 21(8) Other service /Misc Vessel All vessels that do not fall into any of the above sub-segments such as Nuclear Fuel carrier, Alumina Carrier, Search & Rescueand Fire-fighting Vessels. -22. Naval22(1) Naval Vessels used by military forces. The details of such vessels are not tracked by other than forshipbuilding capacity analysis.displacement。