Glossary

Maritime glossary, terms beginning with T (page 9)

All maritime glossary terms that begin with the letter T, drawn from every subject section. 2313 entries.

Showing 250 of 2313 terms (page 9 of 10).

Tu Sun Hao X124. Dredging Industry and Reclamation Contractors: CCCC TSHD.
Tuas Boulevard Yard X113. Drydock and Ship Repair Yards: Seatrium's flagship Singapore yard at Tuas with large drydocks for offshore and commercial repair.
Tuas Megaport X124. Dredging Industry and Reclamation Contractors: Singapore container port reclamation Phase 1 1,337 ha.
Tuas Repair Cluster X113. Drydock and Ship Repair Yards: Concentration of Singaporean repair operations along Tuas under Seatrium and former ST Engineering Marine.
Tubarao Loading X44. Shipping Indices, FFAs and Freight Markets: Brazilian iron ore loading port central to Baltic C3 route definition.
Tubbataha Reefs PSSA X18. Ballast Water, Biofouling and Antifouling: PSSA designated by IMO in 2017 in the Sulu Sea, Philippines.
Tube X75. IMDG Code, Classes, Packing and Segregation: Transportable pressure receptacle with water capacity over 150 and up to 3000 liters.
Tube bundle X19. Engine Room Watchkeeping and UMS Operations: Removable nest of tubes in shell and tube heat exchanger.
Tube Conveyor X94. Port Machinery and Quay Equipment Makers: Pipe conveyor used at coal and cement terminals to enclose the belt within a tubular profile.
Tube nest cleaning X19. Engine Room Watchkeeping and UMS Operations: Mechanical or chemical cleaning of cooler tubes during PMS.
Tubeworm (Hydroides elegans, Ficopomatus enigmaticus) X18. Ballast Water, Biofouling and Antifouling: Calcareous tubeworms among the most invasive hull fouling organisms.
Tubular Boiler X63. Marine Auxiliary Machinery and Pumps: Common term for fire-tube boiler with shell-and-tube arrangement.
Tubular feed water heater X19. Engine Room Watchkeeping and UMS Operations: Heat exchanger raising feed temperature using bleed steam.
Tufton Pool X17. Chartering, Shipbroking and Freight Trading: Tonnage pool participation arrangements managed by Tufton Investment Management.
Tug X15. Ports, Terminals and Stevedoring: vessel providing towing and assistance, see harbour, escort, line-boat.
Tug (harbor, ASD, ATD, RotorTug) B5. Ship Types and Individual Vessels: Tug types.
Tug and Tow Liability X4. Marine Insurance, P&I and Claims: liability of tug owners under tow contracts.
Tug and Towage Simulator X144. Bridge Simulators, Engine Room Simulators, and Maritime Training Equipment: Specialist tug handling simulator at Smit Lamnalco's training centre.
Tug Autonomy Kit X109. Maritime Autonomous Surface Ships and MASS Code: A retrofit package such as the Sea Machines SM300 that adds autonomy to existing harbor and offshore tugs.
Tug Bollard Pull X60. Marine Salvage and Wreck Removal: Maximum static pull a tug can exert at zero speed, the standard rating for salvage tugs.
Tug Bollard Pull (TBP) X173. Mooring, Anchoring, OCIMF MEG4, and Equipment Numeral: Static thrust force available at a tug's towing point, certified by class.
Tug Booking X86. Port Agency, Husbandry and Disbursement: Reservation of harbor tugs for berthing or unberthing.
Tug Boss X159. Marine Pilotage, Pilot Districts, and Pilots' Associations: Lead tug master coordinating with the pilot during multi-tug berthing operations.
Tug Categories (Tariff) X99. Marine Salvage Awards and SCOPIC: SCOPIC classification of tugs by bollard pull for tariff purposes.
Tug Connection X60. Marine Salvage and Wreck Removal: Hookup of the casualty to the salvor's tug, often the most hazardous step in salvage.
Tug Master F3. Seafaring Life, Education, Professions and Institutions: Skilled professional master of a tug.
Tug Master Endorsement X137. Harbour Tugs, Towage Operators and Tug Builders: STCW supplemental certification for masters of higher-power tugs.
Tug Master Simulator X55. Marine Simulators, Training and Maritime Academies: Specialized simulator for harbor and escort tug masters covering tractor, ASD, and Voith Schneider tugs.
Tug Notation T X137. Harbour Tugs, Towage Operators and Tug Builders: ABS class notation T for tugs, indicating compliance with the tug Guide.
Tug operations X125. Superyacht Industry, Builders and Brokers: Required at many ports for yachts above certain GT for berthing.
Tug Standby Order X86. Port Agency, Husbandry and Disbursement: Booking of tugs on standby for restricted maneuvering.
Tug Survey X43. Marine Surveying and Warranty Surveying: A condition and capability inspection of tugs covering bollard pull, fendering, and fire-fighting equipment.
Tug Tow to Recycling X28. Ship Recycling and End-of-Life: Towage operation, with insurance, weather routing, and tow plan approval.
Tug-Barge (ATB/ITB) E4. Cruise, offshore energy and auxiliary/specialised fleets: Articulated/integrated tug-barge unit.
Tugboat Provisioning X120. Marine Catering, Provisions and Ship Chandlers: Smaller-scale chandler service to port tugs, often combined with bunker delivery scheduling.
Tugdock X123. Offshore Wind Installation Vessels and Operators: UK floating wind launch system using inflatable bag technology for shallow port assembly of large substructures.
Tugger Winch X14. Offshore Oil and Gas Marine Operations: Small auxiliary winch for handling lines on deck.
Tugmar Salvage X167. Major Salvage Companies, Wreck Removals, and Equipment: Italian salvage operator active in Mediterranean response.
Tugmaster X15. Ports, Terminals and Stevedoring: occasional term for terminal tractor.
Tugnology X119. Maritime Conferences, Trade Shows and Awards: Biennial tug design conference organized by The ABR Company, alternating with ITS.
TUI AG X64. Cruise Industry Operators, Brands and Ships: German tourism conglomerate parent of TUI Cruises and Marella Cruises.
TUI Cruises X24. Cruise, Passenger Ship and Ferry Operations: Joint venture between TUI AG and Royal Caribbean Group serving the German market with Mein Schiff brand.
Tuktoyaktuk X52. Polar Code, Arctic and Antarctic Shipping: Hamlet on the Beaufort Sea coast in the Northwest Territories of Canada, formerly served by Mackenzie River barge traffic.
Tullett Prebon X161. Shipbroking, Freight Derivatives, and Baltic Indices: London-based interdealer broker that historically intermediated freight derivatives prior to merging into TP ICAP in 2016.
Tumblehome X3. Ship Handling, Seamanship and Deck Vocabulary: Inward slope of the topsides above the waterline.
TUMSAT (Tokyo University of Marine Science and Technology) X160. Maritime Academies, Universities, and STCW Certification: Japanese national university in Tokyo formed in 2003 by the merger of Tokyo University of Mercantile Marine and Tokyo University of Fisheries.
Tuna X10. Marine Biology, Fisheries and Oceanography: Pelagic scombrid fishes of the tribe Thunnini.
Tuna (Canned) X120. Marine Catering, Provisions and Ship Chandlers: IMPA 550107 in oil, 185 g tin, ambient store.
Tuna carriage X26. Reefer Containers and Cold Chain Logistics: Sashimi-grade -60 C super-freezer; other tuna grades -18 to -25 C.
Tuna Fishery D4. Fisheries, aquaculture, blue economy and marine resources: Large pelagic fishery, mostly managed under tuna RFMOs.
Tuna Longliner X87. Fishing Vessels and Fisheries Management: Pelagic longliner targeting bluefin, bigeye, yellowfin, and albacore tuna in all three oceans.
Tuna Purse Seiner X87. Fishing Vessels and Fisheries Management: Vessel rigged with a large purse seine and skiff to encircle tuna schools, including super-seiners of about 1,800 to 2,500 metric tons hold capacity.
Tuna Purse Seiner (Super Seiner) X131. Commercial Fisheries, Trawler Fleets and Seafood Processors: 1,200 to 2,300 GT vessel with 600 to 2,400 m purse seine.
Tunable Risers X153. Offshore Drilling Rigs, FPSOs, and Offshore Vessels: Production risers designed with adjustable buoyancy modules for varying water depths and vessel motions.
Tundra X27. Polar Code, Ice Navigation and Polar Operations: Cold treeless biome surrounding the Arctic Ocean.
TundRA Tug X79. Tugs and Towage Industry: Robert Allan Ltd tug design for ice-class operations in Arctic and subarctic environments.
Tundra-Class X137. Harbour Tugs, Towage Operators and Tug Builders: Sanmar-built RAstar escort tugs in the Tundra naming series.
Tunisia PSC X66. Port State Control and Regional MOUs: Mediterranean MOU member State.
Tunisia-Sicily Cable X37. Marine Spatial Planning, Subsea Cables and Submarine Pipelines: Power and telecom cables across the Sicilian Channel, including the Elmed HVDC project.
Tunisian Maritime Training Centre Sousse X121. Maritime Education, Academies and Universities: STCW provider on the Tunisian coast.
Tunnel Boring Machine Move X104. Project Cargo Forwarders and Heavy Transport: Project move of a tunnel boring machine cutter head and back-up gantries.
Tunnel thruster B2. Marine Engineering: Transverse thruster mounted in a tunnel.
Tunneling X25. Maritime Cybersecurity, OT and IT: Encapsulating one protocol within another, used legitimately for VPNs and maliciously for C2.
TUP X82. Saturation Diving and Offshore Diving Operations: Transfer Under Pressure, movement of divers between chambers and bell at depth.
TUP Comex X82. Saturation Diving and Offshore Diving Operations: Comex transfer-under-pressure system used in the Hydra trials.
Tupi FPSO X153. Offshore Drilling Rigs, FPSOs, and Offshore Vessels: P-class FPSOs operated by Petrobras on the Lula and Tupi pre-salt fields.
Turbidite D2. Hydrography, tides, waves, bathymetry and marine geology: Sediment deposit formed by a turbidity current.
Turbidity X10. Marine Biology, Fisheries and Oceanography: Cloudiness of water due to suspended particles.
Turbidity Current D2. Hydrography, tides, waves, bathymetry and marine geology: Density flow of sediment-laden water down a submarine slope.
Turbidity monitoring X124. Dredging Industry and Reclamation Contractors: Real-time monitoring of plume during dredging, required by most modern permits.
Turbidity Probe X69. EGCS Scrubbers, SCR and Marine Air Emissions: Optical sensor measuring turbidity of discharged scrubber washwater.
Turbine availability X59. Offshore Wind O&M, CTVs and SOVs: Reliability metric for a single turbine, expressed on a time or energy basis.
Turbine blade erosion X19. Engine Room Watchkeeping and UMS Operations: Wet steam damage on turbine blading, mitigated by water separator.
Turbine Blade Trailer X104. Project Cargo Forwarders and Heavy Transport: Specialized trailer with rotating mast for steep-angle blade transport.
Turbine commissioning X59. Offshore Wind O&M, CTVs and SOVs: Sequence of tests and adjustments bringing a newly installed turbine into full grid service.
Turbine Generator X105. Offshore Wind Farm Installation and Vessels: Generator within the wind turbine nacelle, commonly a permanent magnet synchronous machine on modern offshore platforms.
Turbine generator unit (TGU) X57. Ocean Energy Beyond Wind: Specific component name used in tidal stream device documentation.
Turbine Nacelle X104. Project Cargo Forwarders and Heavy Transport: Top housing of a wind turbine containing generator and gearbox, a key project unit.
Turbine oil X61. Marine Lubricants and Cylinder Oils: Highly refined inhibited oil for steam and gas turbines, typically ISO VG 32 or 46.
Turbine-Driven Pump X63. Marine Auxiliary Machinery and Pumps: Pump driven by a steam turbine, used for high-power services such as cargo and feed water.
Turbine, Project Cargo X1. Cargo Science, Commodities and Cargo Care: Wind or gas turbine sections, OOG project freight.
Turbo compounding B2. Marine Engineering: Power-turbine recovery of exhaust energy.
Turbo-electric drive X11. Naval Vessels, Warship Systems and Naval Architecture: Steam turbines driving generators that power electric propulsion motors.
Turbocharger X19. Engine Room Watchkeeping and UMS Operations: Exhaust driven compressor boosting charge air pressure, examples MAN TCA, ABB A100, Mitsubishi MET.
Turbocharger (MET, TPL, A100-L) B2. Marine Engineering: Mitsubishi, ABB, MAN-ES turbo series.
Turbocharger Bearing Renewal X174. Marine Engine Maintenance, Overhaul, and Condition Monitoring: Replacement of inboard and outboard journal and thrust bearings at 16,000 to 24,000-hour intervals depending on lubrication system.
Turbocharger Cartridge Replacement X174. Marine Engine Maintenance, Overhaul, and Condition Monitoring: Modular rotor and bearing assembly swap-out service offered by ABB, MAN, and MET reducing overhaul time.
Turbocharger Cleaning Water X174. Marine Engine Maintenance, Overhaul, and Condition Monitoring: Demineralised or fresh water injected during in-water cleaning to dissolve deposits without thermal shock.
Turbocharger Compatibility X69. EGCS Scrubbers, SCR and Marine Air Emissions: Engineering requirement when placing SCR upstream or downstream of the turbine.
Turbocharger Cut-Out X67. Marine Electrical Systems and Shore Power: Variable-geometry or sequential turbocharging feature affecting genset performance at low electrical load.
Turbocharger overspeed X19. Engine Room Watchkeeping and UMS Operations: Shaft speed above design, alarmed and trended by ECMS.
Turbocharger surge X19. Engine Room Watchkeeping and UMS Operations: Reverse flow event on compressor, audible as low frequency thump.
TurboJET X132. High-Speed Craft, Hydrofoils and Ferry Operators: Hong Kong-Macau ferry brand of Shun Tak-China Travel Ship Management, historically operated 11 Boeing 929 Jetfoils and Foilcats.
Turbot X10. Marine Biology, Fisheries and Oceanography: *Scophthalmus maximus*, a high-value North Atlantic flatfish.
Turbulence X31. Helicopter Operations on Ships: Disturbed airflow around installations affecting helicopter handling on approach.
Turbulence intensity (tidal) X57. Ocean Energy Beyond Wind: Statistical measure of velocity fluctuations at a tidal site, important for fatigue loading on turbines.
Turbulent Kinetic Energy (TKE) D1. Physical and chemical oceanography and marine meteorology: Kinetic energy associated with turbulent eddies.
Turkey PSC X66. Port State Control and Regional MOUs: Black Sea MOU and Paris MOU partner under cooperation; member of MedMOU; hosts BSMOU Secretariat in Istanbul.
Turkish Bunker Range X72. Bunkering Hubs and Bunker Suppliers: Bunker supply region covering Istanbul, Izmit, Aliaga, Mersin, and Ambarli.
Turkish International Ship Registry X98. Ship Registries and Flag States: TUGS, second register of the Republic of Turkiye established by Law No. 4490 of 1999.
Turkish Lloyd Yard Audit X50. Ship Recycling, Demolition and Hong Kong Convention: Yard certifications conducted by Turkish Lloyd for facilities at Aliaga.
Turkish Loyd X98. Ship Registries and Flag States: Klas NK predecessor name occasionally cited; the active Turkish classification society is Turk Loydu.
Turkish Maritime Administration X28. Ship Recycling and End-of-Life: Competent authority overseeing Aliaga recycling facilities.
Turkish Maritime Cluster F3. Seafaring Life, Education, Professions and Institutions: Istanbul-based maritime services concentration.
Turkish Ministry of Environment X118. Ship Recycling Yards, Beaches and Regulation: Competent Authority for HKC under Turkish ratification and for EU List inclusion of Aliaga yards.
Turkish Ministry of Environment, Climate Change X50. Ship Recycling, Demolition and Hong Kong Convention: The Turkish competent authority for HKC and EU SRR implementation at Aliaga.
Turkish Ratification of HKC X118. Ship Recycling Yards, Beaches and Regulation: Turkey deposited its instrument of accession to HKC in 2019.
Turkish Riviera X35. Yacht and Superyacht Industry: Aegean and Mediterranean coast of Turkey including Bodrum, Gocek, Marmaris, and Fethiye.
Turkish Ship Recyclers Association (GEMISANDER) X147. Ship Recycling, Hong Kong Convention, and Recycling Yards: Industry body for Aliaga based recycling facilities.
Turkish Straits X124. Dredging Industry and Reclamation Contractors: Maritime corridor whose ports rely on dredging maintenance.
Turku X85. Ferries, Ro-Pax Operators and Routes: Finnish southwest port hosting Viking Line and Tallink Silja services to Stockholm via Mariehamn and Langnas.
Turku Aboa Mare X121. Maritime Education, Academies and Universities: See Aboa Mare.
Turku University of Applied Sciences X55. Marine Simulators, Training and Maritime Academies: Finnish polytechnic that operates Aboa Mare jointly with Novia University of Applied Sciences.
Turn Bearing X80. Maritime Search and Rescue Coordination: Reciprocal bearing used to complete a pattern leg.
Turn Buckle X104. Project Cargo Forwarders and Heavy Transport: Threaded device used to tension chain or wire lashings on project cargo.
Turn Cycle X91. Submarines and Submarine Cable Systems: Period between successive operational deployments of a submarine, including refit and certification.
Turn of the bilge X3. Ship Handling, Seamanship and Deck Vocabulary: Curved transition between bottom and side.
Turn radius X16. Nautical Science, Navigation and COLREGs: ECDIS parameter used to model planned course alterations.
Turn time X15. Ports, Terminals and Stevedoring: total time a truck spends inside a terminal.
Turn to X3. Ship Handling, Seamanship and Deck Vocabulary: Begin work.
Turn-Around Pilot X159. Marine Pilotage, Pilot Districts, and Pilots' Associations: Pilot designated to conduct both arrival berthing and immediate departure shift for short port calls.
Turnaround day X24. Cruise, Passenger Ship and Ferry Operations: Day on which one cruise disembarks and the next embarks at a homeport.
Turnaround Time Report X86. Port Agency, Husbandry and Disbursement: Report on vessel turnaround time at the port.
Turnbuckle X3. Ship Handling, Seamanship and Deck Vocabulary: Threaded device for tensioning rigging or lashings.
Turnbuckle, D-Ring X76. Stevedoring, Lashing and Cargo Securing: Turnbuckle with a D-ring end fitting for attachment to deck eyes.
Turnbuckle, lever-type X76. Stevedoring, Lashing and Cargo Securing: Turnbuckle with an integral lever handle to apply tension by hand.
Turner, J. M. W. F2. Maritime Culture, Heritage, Archaeology, Art and Museums: English Romantic painter celebrated for seascapes including The Fighting Temeraire.
Turning basin C4. Ports, terminals and coastal/marine civil engineering: Basin where vessels can turn.
Turning circle B1. Naval Architecture: Path traced by the vessel under steady rudder.
Turning circle in ice X27. Polar Code, Ice Navigation and Polar Operations: Significantly larger than in open water; key operational parameter.
Turning gear X19. Engine Room Watchkeeping and UMS Operations: Electric motor and worm reducer rotating engine for inspection and maintenance.
Turnover Rate X41. Cruise Ship Public Health and VSP/USPH: Time required for a recirculation system to process the full volume of a pool or spa.
Turnover, block X58. Shipbuilding Yards and Construction: Use of crane and turning fixture to invert a block for downhand welding access.
Turnover, Demolition Plot X50. Ship Recycling, Demolition and Hong Kong Convention: The annual turnover of vessel deliveries to a specific recycling plot, used in yard capacity planning.
Turpentine X75. IMDG Code, Classes, Packing and Segregation: UN 1299, Class 3 flammable liquid Packing Group III.
Turquoise Ammonia X140. Ammonia as Marine Fuel and Hydrogen Shipping: NH3 from methane pyrolysis with solid carbon byproduct.
Turquoise Yachts X35. Yacht and Superyacht Industry: Turkish builder in Istanbul producing custom steel and aluminum superyachts.
Turret Mooring X14. Offshore Oil and Gas Marine Operations: Turret allowing FPSO to weathervane around fixed seabed legs.
Turtle Excluder Cable Trench X37. Marine Spatial Planning, Subsea Cables and Submarine Pipelines: Cable trench profile shaped to avoid exposure where sea turtle nesting beaches lie above the landfall.
Turtle Excluder Device (TED) D3. Marine environmental science, pollution and conservation: Gear modification reducing sea turtle bycatch in trawls.
Tustumena X85. Ferries, Ro-Pax Operators and Routes: Alaska Marine Highway System ro-pax built 1964 deployed on Southwest Alaska routes.
Tutaja X137. Harbour Tugs, Towage Operators and Tug Builders: Latin American towage operator working at Brazilian ports.
Tutuila Cable Landing X37. Marine Spatial Planning, Subsea Cables and Submarine Pipelines: American Samoa landing site for Hawaiki and SAS cable systems.
TUV X42. Offshore Wind Installation and Cable Lay: Reference certification body grouping.
Tuvalu Ship Registry X98. Ship Registries and Flag States: National registry of Tuvalu, administered by the Tuvalu Ship Registry from Singapore.
Tuzla Cluster X113. Drydock and Ship Repair Yards: Turkish ship repair concentration east of Istanbul on the Sea of Marmara with more than fifty newbuild and repair yards.
TVA X33. Inland Navigation and Barge Operations: Tennessee Valley Authority, US federal corporation overseeing Tennessee River navigation and power.
TVA equation C4. Ports, terminals and coastal/marine civil engineering: Wave runup empirical relationships used in coastal design.
Tweendeck X6. Container, Intermodal and Trade Codes: Intermediate deck in multipurpose vessels.
Tweendecker B5. Ship Types and Individual Vessels: General-cargo ship with intermediate decks.
Twelve Metre (12 Metre) X84. Yacht Racing, Regattas and Sailing Governance: A development class used for the America's Cup from 1958 to 1987.
Twente Canal X166. Inland Waterways, Ferries, RoRo, and Short Sea Shipping: The 65 km Dutch canal from the IJssel at Zutphen to Enschede via Hengelo, of CEMT Class Va.
Twenty-Foot Dry Standard X83. ISO Container Manufacturing and Leasing: ISO dry container 6.058 m long, 2.438 m wide, and 2.591 m high with internal volume around 33.2 cubic meters.
Twenty-Foot Equivalent Unit (TEU) F5. The Reference Layer: Glossary, Units, Signals and Information Sources: Standard container capacity unit.
TWIC X6. Container, Intermodal and Trade Codes: Transportation Worker Identification Credential, US port worker ID.
Twilight X16. Nautical Science, Navigation and COLREGs: Civil (Sun 0 to 6 degrees below), Nautical (6 to 12), Astronomical (12 to 18).
Twin Cloud Architecture E3. Technology, digitalization and smart shipping: Redundant cloud deployment for fleet platforms.
Twin Crane Lift X167. Major Salvage Companies, Wreck Removals, and Equipment: Coordinated lift between two crane vessels for heavy wreck sections, used by Heerema and Saipem.
Twin Crawler Crane X104. Project Cargo Forwarders and Heavy Transport: Two crawler crane bases linked into one unit, such as the Demag CC 8800-1 Twin.
Twin Disc gearbox X90. Marine Engine Specific Model Enumeration: American manufacturer of marine transmissions and reduction gearboxes used with high-speed engines.
Twin engine TSHD X124. Dredging Industry and Reclamation Contractors: Standard configuration since 1990s, redundant for safety.
Twin entry lubricator X61. Marine Lubricants and Cylinder Oils: Cylinder lubrication arrangement that supplies multiple quills around the liner from one pump element.
Twin Hybrid Power Plant D6. Decarbonization, emissions and alternative fuels: Two engine sets sharing load for efficiency.
Twin in-and-out (twin-screw rotation) X38. Propellers, Stern Gear and Shaft Lines: Convention in which port and starboard propellers rotate such that blade tops move outward (or inward) at top dead center.
Twin Inlet Turbocharger X174. Marine Engine Maintenance, Overhaul, and Condition Monitoring: Turbocharger with divided turbine inlet for pulse-charging on six and eight cylinder engines, requiring matched pipework.
Twin lift X6. Container, Intermodal and Trade Codes: STS crane fitted with a spreader handling two 20 ft containers simultaneously.
Twin Marine Lift X167. Major Salvage Companies, Wreck Removals, and Equipment: Versabar style twin hull lift concept exemplified by VB10000.
Twin Otter Trawler X87. Fishing Vessels and Fisheries Management: Vessel towing two otter trawls with three or four warps and three or four doors.
Twin pick X6. Container, Intermodal and Trade Codes: Yard handler equivalent of twin lift.
Twin Rig Beam Trawler X87. Fishing Vessels and Fisheries Management: Vessel towing two beam trawls from outrigger booms, standard in the Dutch fleet.
Twin screw X3. Ship Handling, Seamanship and Deck Vocabulary: Vessel with two propellers.
Twin Skeg Catamaran X132. High-Speed Craft, Hydrofoils and Ferry Operators: Catamaran with two demi-hulls connected by a structural wet deck, the standard Incat and Austal configuration.
Twin Skeg Design D6. Decarbonization, emissions and alternative fuels: Hull design improving propulsive efficiency.
Twin twenty X6. Container, Intermodal and Trade Codes: Two 20 ft containers on a 40 ft chassis or wagon.
Twin Twenty Stowage X9. Cargo Securing, Lashing and Stability Vocabulary: Two TEU stowed in one FEU bay; requires special fittings.
Twin-20 Lift X94. Port Machinery and Quay Equipment Makers: STS or yard crane move handling two 20-foot containers simultaneously with a twin spreader.
Twin-40 Lift X94. Port Machinery and Quay Equipment Makers: Tandem move handling two 40-foot containers end-to-end with a tandem spreader.
Twin-Crane Tandem Lift X81. Project Cargo, Heavy-Lift and Module Carriers: Heavy-lift technique using two cranes on the same vessel to lift one load.
Twin-engine Scrubber X69. EGCS Scrubbers, SCR and Marine Air Emissions: Common arrangement where two engine uptakes share one scrubber tower.
Twin-fuel storage X34. Decarbonization, Alternative Fuels and Carbon Pricing: Side-by-side or stacked tank arrangement allowing dual-fuel operation.
Twin-Screw Pump X63. Marine Auxiliary Machinery and Pumps: Screw pump with two intermeshing rotors, used for cargo and viscous fluid duty.
Twin-Screw Stern Drive Conventional X30. Tug Operations and Harbour Towage: Older arrangement of two propellers and rudders aft with no azimuth capability.
Twin-Screw Towboat X103. US Inland Waterway Towing and Barge: A pushboat with two propellers, the most common inland configuration.
Twin-Screw Tug E4. Cruise, offshore energy and auxiliary/specialised fleets: Conventional twin-propeller tug.
Twin-skeg stern B1. Naval Architecture: Stern with two slender skegs supporting twin shafts.
Twin-Twenty Spreader X46. Container Terminal Operations: A spreader fitted with retractable twenty-foot heads enabling single or twin lifts of 20-foot boxes.
Twist (Chain) X173. Mooring, Anchoring, OCIMF MEG4, and Equipment Numeral: Rotational misalignment in deployed chain leading to fatigue and damage, managed by anchor swivels and proper retrieval.
Twist-Lock Stress X96. Hull Integrity Monitoring and Strain Gauges: Force in container twist-lock fittings induced by stack motion and lashing loads.
Twisted leading edge (rudder) X38. Propellers, Stern Gear and Shaft Lines: Geometry of the Becker Twisted Rudder leading edge matching slipstream swirl.
Twistlock X1. Cargo Science, Commodities and Cargo Care: Locking device joining containers at corner castings.
Twistlock pin X6. Container, Intermodal and Trade Codes: Operating pin in a manual twistlock.
Twistlock, automatic X76. Stevedoring, Lashing and Cargo Securing: See FATL.
Twistlock, manual X76. Stevedoring, Lashing and Cargo Securing: Twistlock requiring manual operation of a handle to lock and unlock.
Twistlock, semi-automatic X76. Stevedoring, Lashing and Cargo Securing: See SATL.
Two Factor Authentication X48. Maritime Cybersecurity: Authentication requiring two independent factors, often a password and a token or app generated code.
Two Hundred Tonne Bollard Pull Class X60. Marine Salvage and Wreck Removal: Class of large ocean salvage tugs with bollard pull above 200 tonnes.
Two Percent Threshold X41. Cruise Ship Public Health and VSP/USPH: AGE prevalence level among passengers or crew at which an initial special report to CDC is required.
Two Stroke Diesel Generator X67. Marine Electrical Systems and Shore Power: Rare configuration where a low-speed two-stroke crosshead engine drives a generator, found on certain LNG carriers.
Two stroke engine X19. Engine Room Watchkeeping and UMS Operations: Engine completing power cycle in one crank revolution, dominant in propulsion.
Two Vessel Coordinated Search X80. Maritime Search and Rescue Coordination: PS or CSC variant employing two surface SRUs.
Two Way Authentication X109. Maritime Autonomous Surface Ships and MASS Code: A cyber security control on the ship to shore link requiring mutual identity verification between vessel and remote operations center.
Two way radio X59. Offshore Wind O&M, CTVs and SOVs: Marine VHF used for communication between vessels, the wind farm control room, and shore.
Two Years Before the Mast F2. Maritime Culture, Heritage, Archaeology, Art and Museums: 1840 maritime memoir by Richard Henry Dana.
Two-bearing fix X16. Nautical Science, Navigation and COLREGs: Fix from two simultaneous bearings.
Two-Component Coating X88. Marine Surface Preparation and Coatings Application: Coating supplied as resin and curing agent in separate containers mixed in a specified ratio immediately before application.
Two-component epoxy paint B4. Shipbuilding, Materials, Sea Trials, Retrofits and Recycling: PSPC-compliant ballast tank coating.
Two-Element Control X63. Marine Auxiliary Machinery and Pumps: Boiler feed water control using drum level and steam flow signals.
Two-Factor Authentication (2FA) X148. Maritime Cybersecurity, IACS Cyber Rules, and Incidents: A control required by most class cyber notations for privileged shoreside access to fleet systems.
Two-pack coating X45. Marine Paints, Coatings and Antifouling: Coating supplied in two components mixed before use, such as epoxy and polyurethane.
Two-parameter Pierson-Moskowitz spectrum X162. Naval Architecture, Stability, Resistance, and Structural Design: Wave energy spectrum for fully developed seas used in seakeeping calculations.
Two-pass BWMS X18. Ballast Water, Biofouling and Antifouling: System that treats water both at uptake and at discharge.
Two-Person Rule E1. Maritime security, geopolitics and risk: Critical-system access control reducing insider risk.
Two-pilot operation X32. Marine Pilotage and Pilot Operations: Pilotage with two pilots aboard, for long transits or large vessels.
Two-Speed Pump X63. Marine Auxiliary Machinery and Pumps: Pump with two-speed motor providing different flow capacities for varying demand.
Two-Stage Compressor X63. Marine Auxiliary Machinery and Pumps: Reciprocating compressor with low- and high-pressure cylinders separated by an intercooler.
Two-Stage Cooling X41. Cruise Ship Public Health and VSP/USPH: Cooling food from 57 C (135 F) to 21 C (70 F) in 2 hours and to 5 C (41 F) within 4 additional hours.
Two-stroke crosshead engine B2. Marine Engineering: Slow-speed engine with crosshead bearing.
Two-stroke direct drive X38. Propellers, Stern Gear and Shaft Lines: Propulsion arrangement with a low-speed two-stroke directly coupled to the propeller, the dominant ocean-going merchant configuration.
Two-stroke dual-fuel X56. LNG/LPG Carriers and IGC Code: Slow-speed two-stroke engine capable of running on gas or liquid fuel, including MAN B and W ME-GI and Wartsila X-DF series.
Two-Tone Emergency Signal X23. AIS, GMDSS, IALA Buoyage and Aids to Navigation: 2200/1300 Hz alarm formerly used to actuate radio watch receivers; superseded by DSC.
Two-Way Forklift Pocket X83. ISO Container Manufacturing and Leasing: Pair of slots in the base of a 20-foot container permitting forklift handling from either side.
Two-Way Lashing X9. Cargo Securing, Lashing and Stability Vocabulary: Lashing pattern providing fore and aft restraint.
Two-way VHF radiotelephone X170. SOLAS 1974 Convention: Chapter-by-Chapter Glossary: Portable VHF for survival-craft use, minimum three per ship of 500 GT and above per SOLAS III/6.2.1.
Two-Wheel Per Axle SPMT X104. Project Cargo Forwarders and Heavy Transport: SPMT axle line configuration with two wheels per axle on each side.
Two-Wide Tow X103. US Inland Waterway Towing and Barge: A tow configured two barges across, common in restricted waterways and on smaller rivers.
TXRX X168. Bridge Electronics: Radar, ECDIS, GMDSS, and IBS: Common abbreviation for radar transmitter-receiver, located in the mast assembly.
Tyco Resolute X122. Submarine Cable Laying, Repair Vessels and Operators: Original name of CS Reliance and CS Resolute pair, retained as fleet branding in legacy contracts.
Tyco Responder X122. Submarine Cable Laying, Repair Vessels and Operators: Former name of SubCom Responder before the 2014 rebrand.
Tyco Telecommunications X37. Marine Spatial Planning, Subsea Cables and Submarine Pipelines: Predecessor name for what later became TE SubCom, then SubCom LLC, a major submarine cable supplier.
Tycom Atlantic X37. Marine Spatial Planning, Subsea Cables and Submarine Pipelines: Older transatlantic submarine cable network from Tyco Submarine Systems.
Tympanic thermometer X36. Shipboard Medical, Telemedicine and Seafarer Health: Infrared ear thermometer in IMGS Annex V.
Type 001 Liaoning X106. Naval Surface Combatants: People's Liberation Army Navy aircraft carrier converted from the unfinished Varyag, commissioned 2012.
Type 002 Shandong X106. Naval Surface Combatants: People's Liberation Army Navy first domestically built aircraft carrier, commissioned 2019.
Type 003 Fujian X106. Naval Surface Combatants: People's Liberation Army Navy first carrier with electromagnetic catapults, launched 2022.
Type 045 X106. Naval Surface Combatants: Royal Navy Daring-class air-defense destroyer of six ships displacing about 8,500 tons.
Type 052B X106. Naval Surface Combatants: People's Liberation Army Navy Luyang I-class destroyer class of two ships.
Type 052C X106. Naval Surface Combatants: People's Liberation Army Navy Luyang II-class destroyer class of six ships.
Type 052D X62. Naval Warships and Combat Systems: Chinese Luyang III-class guided-missile destroyer.
Type 054A X106. Naval Surface Combatants: People's Liberation Army Navy Jiangkai II-class general-purpose frigate class of about 30 ships.
Type 055 X62. Naval Warships and Combat Systems: Chinese Renhai-class large guided-missile destroyer.
Type 056 X62. Naval Warships and Combat Systems: Chinese Jiangdao-class corvette.
Type 071 X106. Naval Surface Combatants: People's Liberation Army Navy Yuzhao-class amphibious transport dock class of eight ships.
Type 075 X11. Naval Vessels, Warship Systems and Naval Architecture: PLAN landing helicopter dock, lead ship Hainan.
Type 091 X62. Naval Warships and Combat Systems: Chinese Han-class nuclear-powered attack submarine class.
Type 092 X62. Naval Warships and Combat Systems: Chinese Xia-class nuclear-powered ballistic missile submarine.
Type 092 (Xia-class) X91. Submarines and Submarine Cable Systems: Chinese PLAN ballistic missile submarine class.
Type 093 X62. Naval Warships and Combat Systems: Chinese Shang-class nuclear-powered attack submarine.
Type 093 (Shang-class) X91. Submarines and Submarine Cable Systems: Chinese PLAN nuclear attack submarine class with multiple subvariants.
Type 094 X62. Naval Warships and Combat Systems: Chinese Jin-class nuclear-powered ballistic missile submarine.
Type 094 (Jin-class) X91. Submarines and Submarine Cable Systems: Chinese PLAN ballistic missile submarine class armed with JL-2 and JL-3 SLBMs.