Glossary

Maritime glossary, terms beginning with H (page 8)

All maritime glossary terms that begin with the letter H, drawn from every subject section. 1949 entries.

Showing 199 of 1949 terms (page 8 of 8).

HVO (Hydrotreated Vegetable Oil) X2. Marine Bunker Fuels, Lubricants and Bunkering Operations: Renewable diesel produced by hydroprocessing fats and oils, fully compatible with conventional distillate systems.
HVPQ Update Cycle X150. Tanker Vetting: OCIMF SIRE, CDI, RightShip, and TMSA: The OCIMF requirement that operators update HVPQ data within 14 days of any change.
HVS Hydrogen Tug (Voith / Linde 2024) X30. Tug Operations and Harbour Towage: Voith and Linde hydrogen fuel cell tug initiative announced in 2024.
HVU (High-Value Unit) E1. Maritime security, geopolitics and risk: Escorted ship requiring protective formation.
HWS X33. Inland Navigation and Barge Operations: Hochwasserstand, high water level threshold on German rivers.
HX X64. Cruise Industry Operators, Brands and Ships: Brand identity adopted in 2024 by Hurtigruten Expeditions for its global expedition cruise operations.
HX (Hurtigruten Expeditions) X97. Polar Expedition Cruise and IAATO Operations: Post-2024 expedition brand of the Hurtigruten group running MS Roald Amundsen, MS Fridtjof Nansen, MS Otto Sverdrup, and MS Spitsbergen.
Hyaline Subsea Cable X37. Marine Spatial Planning, Subsea Cables and Submarine Pipelines: Trade reference to ultra-low loss optical fiber cable designs used in modern transoceanic systems.
Hybrid coating X45. Marine Paints, Coatings and Antifouling: Coating combining two binder chemistries, such as epoxy-siloxane or acrylic-polyurethane.
Hybrid Composite Line X173. Mooring, Anchoring, OCIMF MEG4, and Equipment Numeral: Mooring line combining materials such as polyester jackets over HMPE cores to balance cost, weight, and durability.
Hybrid container vessel X26. Reefer Containers and Cold Chain Logistics: Ship designed for both container and traditional refrigerated bulk operations.
Hybrid laser-arc welding B4. Shipbuilding, Materials, Sea Trials, Retrofits and Recycling: Combined laser+MAG welding.
Hybrid Network X68. Maritime Satcom and Telecommunications: Maritime connectivity design combining VSAT, L-band, and cellular bearers under unified management.
Hybrid Power Plant X109. Maritime Autonomous Surface Ships and MASS Code: A combination of diesel generation and battery storage common in autonomous coastal vessels including the Yara Birkeland.
Hybrid Propulsion D6. Decarbonization, emissions and alternative fuels: Combination of multiple propulsion sources for efficiency.
Hybrid RTG X15. Ports, Terminals and Stevedoring: RTG with battery and diesel for fuel savings, e.g., Konecranes hybrid RTG.
Hybrid Scrubber X69. EGCS Scrubbers, SCR and Marine Air Emissions: EGCS capable of switching between open-loop and closed-loop modes.
Hybrid Threat X48. Maritime Cybersecurity: Coordinated combination of cyber, physical, information, and economic instruments against maritime interests.
Hybrid Tribunal X51. Maritime Arbitration, Law and BIMCO Clauses: A panel composed of arbitrators with mixed legal and commercial backgrounds.
Hybrid Tug X30. Tug Operations and Harbour Towage: Tug with combined diesel-mechanical and battery-electric propulsion.
Hyde and Co X114. Maritime Arbitration and Shipping Law Firms: Sydney maritime law firm.
Hyde GUARDIAN X18. Ballast Water, Biofouling and Antifouling: Filtration plus medium-pressure UV BWMS by Hyde Marine, now part of De Nora.
Hydor AS X145. P&I Clubs, War Risk Insurers, and Marine Insurance Markets: Norwegian fixed-premium hull, P&I, and war risk MGA.
Hydra X123. Offshore Wind Installation Vessels and Operators: Seajacks WTIV built 2014, NG-2500X design, 800 t leg-encircling crane, 109 m length.
Hydra Insurance Company X108. Marine Insurance and P&I Clubs: The Bermuda captive of the International Group of P&I Clubs, participating in pool layers above the individual club retention.
Hydra Insurance Company Limited X53. Marine Insurance, P&I and Hull Clauses: The Bermuda-incorporated captive owned by International Group clubs, retaining specific layers of the IG reinsurance program.
Hydra Series X82. Saturation Diving and Offshore Diving Operations: Comex experimental deep-dive program in the 1980s and early 1990s.
Hydra X X82. Saturation Diving and Offshore Diving Operations: 1992 Comex onshore experimental saturation dive reaching 701 m simulated depth.
Hydram Steering Gear X174. Marine Engine Maintenance, Overhaul, and Condition Monitoring: Hydraulic ram-type steering actuator using a Rapson slide mechanism, common on tankers and bulk carriers.
Hydrant Cap Inspection X5. Marine Surveying and Inspection: Verification of hydrant caps, gaskets, and spanners.
Hydrant spacing X170. SOLAS 1974 Convention: Chapter-by-Chapter Glossary: Located so two jets can reach any part of the ship from separate hydrants per SOLAS II-2/10.2.1.5.
Hydrate X14. Offshore Oil and Gas Marine Operations: Solid ice-like compound of gas and water; flow assurance hazard.
Hydrate Inhibition Line X37. Marine Spatial Planning, Subsea Cables and Submarine Pipelines: Subsea line carrying methanol or MEG to flowlines for hydrate prevention in deepwater oil and gas systems.
Hydrate Stability Zone D5. Coastal processes, sea-level, cryosphere and ocean observation science: Pressure-temperature window for methane hydrate stability.
Hydrated Lime X69. EGCS Scrubbers, SCR and Marine Air Emissions: Calcium hydroxide granulate used as reagent in dry scrubbers such as Couple Systems DryEGCS.
Hydraulic Climbing Jack X104. Project Cargo Forwarders and Heavy Transport: Strand jack or hydraulic jack used to raise project units in steps.
Hydraulic clutch X19. Engine Room Watchkeeping and UMS Operations: Coupling between engine and shaft generator allowing PTO engagement at sea.
Hydraulic disturbance X18. Ballast Water, Biofouling and Antifouling: Mechanism for organism mortality through pumps, cavitation, and pressure changes.
Hydraulic Gantry X104. Project Cargo Forwarders and Heavy Transport: Portable lifting system using hydraulic cylinders on legs running on rails.
Hydraulic manipulator X65. ROVs, AUVs, USVs and Marine Robotics: Subsea arm powered by the ROV HPU, used for valve operation, tooling and rigging tasks.
Hydraulic Oil Disposal X50. Ship Recycling, Demolition and Hong Kong Convention: The categorized removal of hydraulic system oils from steering gear, cranes, and watertight door systems before hot work.
Hydraulic oil HM X61. Marine Lubricants and Cylinder Oils: Antiwear hydraulic fluid per ISO 6743-4 type HM, with rust, oxidation, and antiwear additives.
Hydraulic oil ISO VG 32 X61. Marine Lubricants and Cylinder Oils: Hydraulic fluid with kinematic viscosity of 32 mm squared per second at 40 degrees Celsius.
Hydraulic oil ISO VG 46 X61. Marine Lubricants and Cylinder Oils: Hydraulic fluid with kinematic viscosity of 46 mm squared per second at 40 degrees Celsius, common in shipboard service.
Hydraulic oil ISO VG 68 X61. Marine Lubricants and Cylinder Oils: Hydraulic fluid with kinematic viscosity of 68 mm squared per second at 40 degrees Celsius, used in higher temperature systems.
Hydraulic power pack X19. Engine Room Watchkeeping and UMS Operations: Self contained pumps, tank, and accumulator unit serving steering gear or cargo system.
Hydraulic power pack (HPU) B2. Marine Engineering: Power unit for steering, hatch covers, deck machinery.
Hydraulic power unit X59. Offshore Wind O&M, CTVs and SOVs: Pump and tank assembly providing pressurized fluid to gangway, crane, and pitch system actuators.
Hydraulic Pump X63. Marine Auxiliary Machinery and Pumps: Pump delivering oil to hydraulic actuators, typically axial piston or vane type.
Hydraulic Shears X13. Marine Salvage and Wreck Removal: Underwater steel-cutting tool used in wreck dismantling.
Hydraulic Suspension Trailer X104. Project Cargo Forwarders and Heavy Transport: Trailer using hydraulic cylinders rather than mechanical springs, key to SPMT designs.
Hydraulic Test X5. Marine Surveying and Inspection: Pressure test using water to verify tank or pipe integrity.
Hydraulic Tightening X174. Marine Engine Maintenance, Overhaul, and Condition Monitoring: Use of calibrated stud tensioners to apply controlled bolt preload on main bearings, cylinder heads, and tie rods.
Hydraulic Windlass X173. Mooring, Anchoring, OCIMF MEG4, and Equipment Numeral: Anchor windlass driven by a hydraulic motor, valued for fine speed control and stall tolerance.
Hydrazine X174. Marine Engine Maintenance, Overhaul, and Condition Monitoring: Boiler water oxygen scavenger dosed alongside ammonia for pH control, increasingly replaced by carbohydrazide.
Hydrazine Anhydrous X75. IMDG Code, Classes, Packing and Segregation: UN 2029, Class 8 with Class 3 and 6.1 subsidiary risks.
HYDREX X137. Harbour Tugs, Towage Operators and Tug Builders: Belgian underwater hull repair group, often supporting tug-assist operations.
HYDRO Conference X73. Marine Hydrography, Charting and ENC: The biennial UKHO international conference on hydrography.
Hydroacoustic Positioning D2. Hydrography, tides, waves, bathymetry and marine geology: Positioning of underwater assets using acoustics.
Hydroblasting X45. Marine Paints, Coatings and Antifouling: Ultra-high-pressure water jetting used for paint removal and surface preparation without abrasive.
Hydrocarbon Cargoes X1. Cargo Science, Commodities and Cargo Care: Crude, condensate, LPG, LNG, refined products.
Hydrocarbon Free Certificate X28. Ship Recycling and End-of-Life: Confirmation of removal of fuel and lubricant residues from tanks and pipes.
Hydrocarbon Sniff Test X5. Marine Surveying and Inspection: LEL meter check for residual hydrocarbon in tanks.
Hydrocarbon Vapor Monitoring X60. Marine Salvage and Wreck Removal: Continuous gas measurement during cargo and bunker removal to confirm safe atmospheres.
Hydrocat 48 X105. Offshore Wind Farm Installation and Vessels: Dual-fuel hydrogen-powered crew transfer vessel introduced by Windcat and CMB.TECH for low-emission offshore wind service.
Hydrochloric Acid X1. Cargo Science, Commodities and Cargo Care: Class 8 corrosive; chemical tanker cargo.
Hydrochloric Acid Solution X75. IMDG Code, Classes, Packing and Segregation: UN 1789, Class 8 corrosive liquid Packing Group II or III by concentration.
Hydrochloric Acid UN 1789 X172. IMDG Code: Classes, Divisions, Segregation, and Key UN Numbers: A Class 8 corrosive liquid, with packing group II at greater than 25 per cent HCl and packing group III otherwise.
Hydrocortisone sodium succinate X36. Shipboard Medical, Telemedicine and Seafarer Health: 100 mg vial for IV/IM use in severe asthma and anaphylaxis.
Hydrocracked base oil X61. Marine Lubricants and Cylinder Oils: API Group II or III base stock produced by hydrocracking and dewaxing of vacuum gas oil.
Hydrocyclone X69. EGCS Scrubbers, SCR and Marine Air Emissions: Centrifugal device removing solid particles from scrubber washwater.
HydroD X54. Naval Architecture Software and IACS Rules: DNV Sesam preprocessor for hydrostatic, stability, and hydrodynamic analyses.
Hydrodynamic derivatives B1. Naval Architecture: Coefficients Yv, Nr, etc. used in maneuvering equations.
Hydrodynamic Lift X79. Tugs and Towage Industry: Lateral force generated by a tug's hull when sailing at an angle to the tow line during indirect escort.
Hydrodynamic smoothness X45. Marine Paints, Coatings and Antifouling: Property of an antifouling surface that minimizes added frictional resistance.
Hydrodynamics X10. Marine Biology, Fisheries and Oceanography: Study of fluids in motion.
Hydrofluoric Acid Anhydrous X75. IMDG Code, Classes, Packing and Segregation: UN 1052, Class 8 corrosive with Class 6.1 subsidiary risk, Packing Group I.
Hydrofluoric Acid Solution X75. IMDG Code, Classes, Packing and Segregation: UN 1790, Class 8 corrosive with Class 6.1 subsidiary risk.
Hydrofoil B1. Naval Architecture: Lifting surface that supports a hull above the water.
Hydrofoil minesweeping X77. Naval Mine Warfare and Mine Countermeasures: An experimental concept evaluated for high-speed influence sweeping in shallow water.
Hydrogel X165. Marine Coatings, Antifouling, and Hull Husbandry: A water-attracting polymer surface domain incorporated in Hempasil X3 and SeaQuantum X200 to reduce slime adhesion.
Hydrogel surface X45. Marine Paints, Coatings and Antifouling: Water-bound surface layer formed by certain silicone fouling-release coatings to mimic biological non-stick interfaces.
Hydrogen X111. Methanol, Ammonia and Alternative Marine Fuels: Lightest chemical element used as a marine fuel either as liquid LH2 at minus 253 degrees Celsius or as compressed gas at 700 bar.
Hydrogen (H2) X149. Marine Fuels, Bunkering, and Alternative Fuels: A zero-carbon fuel under early-stage maritime adoption, mainly for fuel cells, with cryogenic and pressurized storage challenges.
Hydrogen Auto-Ignition Temperature X111. Methanol, Ammonia and Alternative Marine Fuels: About 500 degrees Celsius for H2, with wide flammability limits in air requiring careful gas detection.
Hydrogen carrier X34. Decarbonization, Alternative Fuels and Carbon Pricing: Substance such as ammonia, methanol, or LOHC used to transport hydrogen.
Hydrogen Combustion Engine D6. Decarbonization, emissions and alternative fuels: Internal combustion engine running on hydrogen.
Hydrogen Compressed X75. IMDG Code, Classes, Packing and Segregation: UN 1049, Class 2.1 flammable gas.
Hydrogen content X47. Marine Fuel Quality and ISO 8217: Mass fraction of hydrogen in fuel, correlating with calorific value and CO2 emission factor.
Hydrogen Council Annual Meeting X119. Maritime Conferences, Trade Shows and Awards: Annual gathering of hydrogen-economy stakeholders with shipping work group.
Hydrogen Cyanide Stabilized X75. IMDG Code, Classes, Packing and Segregation: UN 1051, Class 6.1 with Class 3 subsidiary risk, Packing Group I.
Hydrogen embrittlement X34. Decarbonization, Alternative Fuels and Carbon Pricing: Material degradation in pipes and tanks exposed to hydrogen.
Hydrogen Evolution X100. Marine Cathodic Protection and Anodes: The cathodic reduction of water to hydrogen gas that can occur at potentials more negative than about -1100 mV.
Hydrogen export pipeline X57. Ocean Energy Beyond Wind: Subsea pipeline carrying gaseous or liquid hydrogen from offshore production platforms to shore.
Hydrogen Fluoride X75. IMDG Code, Classes, Packing and Segregation: UN 1052, see hydrofluoric acid anhydrous.
Hydrogen fuel B2. Marine Engineering: Cryogenic or compressed H2, addressed in upcoming IGF amendments.
Hydrogen Fuel Cell D6. Decarbonization, emissions and alternative fuels: Electrochemical device producing electricity from hydrogen.
Hydrogen Inland Vessel X33. Inland Navigation and Barge Operations: Inland cargo vessel powered by hydrogen fuel cells, exemplified by Antonie.
Hydrogen Peroxide X1. Cargo Science, Commodities and Cargo Care: Class 5.1 oxidizer; carried at controlled concentration.
Hydrogen Peroxide Aqueous Solution X75. IMDG Code, Classes, Packing and Segregation: UN 2014 above 20 percent and not more than 60 percent, Class 5.1 with Class 8 subsidiary risk.
Hydrogen Peroxide Aqueous Solution Stabilized X75. IMDG Code, Classes, Packing and Segregation: UN 2015 above 60 percent, Class 5.1 with Class 8 subsidiary risk, Packing Group I.
Hydrogen peroxide treatment X18. Ballast Water, Biofouling and Antifouling: Oxidative BWMS chemistry used by some systems for disinfection.
Hydrogen Peroxide UN 2014 X172. IMDG Code: Classes, Divisions, Segregation, and Key UN Numbers: Aqueous solutions with 20 to 60 per cent H2O2 stabilised, Class 5.1 with subsidiary risk 8, packing group II.
Hydrogen sulfide (H2S) X47. Marine Fuel Quality and ISO 8217: Toxic gas dissolved in residual fuel, capped at 2 mg/kg in the liquid phase by ISO 8217 to limit occupational exposure.
Hydrogen Sulfide Liquefied X75. IMDG Code, Classes, Packing and Segregation: UN 1053, see H2S entry.
Hydrogen, liquid (LH2) X2. Marine Bunker Fuels, Lubricants and Bunkering Operations: Cryogenic fuel under development, stored at -253 C.
Hydrogenious LOHC Technologies X140. Ammonia as Marine Fuel and Hydrogen Shipping: Erlangen company licensing dibenzyltoluene LOHC and StoragePLANT modules of up to 12 tpd H2.
Hydrographer of the Navy X73. Marine Hydrography, Charting and ENC: The historical title held by the UKHO Chief Executive when UKHO was part of the Royal Navy.
Hydrographers Passage X32. Marine Pilotage and Pilot Operations: Compulsory pilotage route through the Great Barrier Reef between Mackay and the Coral Sea.
Hydrographic Chart F5. The Reference Layer: Glossary, Units, Signals and Information Sources: Nautical chart produced by a hydrographic office.
Hydrographic Dictionary X73. Marine Hydrography, Charting and ENC: IHO Publication S-32.
Hydrographic Office B3. Nautical Science: National hydrographic agency producing charts.
Hydrographic Office of the People's Liberation Army Navy X73. Marine Hydrography, Charting and ENC: The Chinese national HO based in Tianjin.
Hydrographic Reanalysis D5. Coastal processes, sea-level, cryosphere and ocean observation science: Long-term reconstruction of ocean state from hydrographic data.
Hydrographic survey C4. Ports, terminals and coastal/marine civil engineering: IHO S-44 compliant bathymetric survey.
Hydrographic Survey Vessel E4. Cruise, offshore energy and auxiliary/specialised fleets: Vessel for bathymetric/geophysical survey.
Hydrography B3. Nautical Science: Science of surveying water bodies.
Hydrography (polar) X27. Polar Code, Ice Navigation and Polar Operations: Sparse hydrographic survey coverage in many Arctic waters; SOLAS V/9 considerations.
Hydroid X65. ROVs, AUVs, USVs and Marine Robotics: Original manufacturer of the REMUS AUV family, acquired by Kongsberg in 2008.
Hydrolysis Catalyst X69. EGCS Scrubbers, SCR and Marine Air Emissions: Reactor converting urea into ammonia upstream of SCR catalyst beds.
Hydromea Vertex X65. ROVs, AUVs, USVs and Marine Robotics: Compact battery powered AUV from Hydromea for confined space inspection of subsea infrastructure.
Hydrometer Correction X115. Marine Bunker and Cargo Surveying: Adjustment of hydrometer reading for meniscus, surface tension, and glass expansion when computing density at 15 degrees C.
Hydrophone D5. Coastal processes, sea-level, cryosphere and ocean observation science: Underwater microphone for acoustic measurements.
Hydrophore X19. Engine Room Watchkeeping and UMS Operations: Pressurized tank with air cushion supplying domestic fresh and salt water.
Hydroprocessed renewable diesel X2. Marine Bunker Fuels, Lubricants and Bunkering Operations: Synonym for HVO.
HydroQuest X57. Ocean Energy Beyond Wind: French tidal stream developer of vertical-axis turbines including the OceanQuest demonstrator in the Raz Blanchard.
Hydroquinone Monomethyl Ether X93. IBC Code and Chemical Tanker Operations: Chemical inhibitor commonly abbreviated MEHQ used to stabilize acrylate and methacrylate monomers during carriage.
Hydrostatic curves B1. Naval Architecture: Curves of form versus draft.
Hydrostatic Pressure D1. Physical and chemical oceanography and marine meteorology: Pressure at depth due to the weight of overlying water.
Hydrostatic release X27. Polar Code, Ice Navigation and Polar Operations: HRU for liferafts must function at Polar Service Temperature.
Hydrostatic Release Unit X13. Marine Salvage and Wreck Removal: Device freeing rafts and beacons from sunken vessels.
Hydrostatic Release Unit (HRU) X23. AIS, GMDSS, IALA Buoyage and Aids to Navigation: Pressure-activated device that releases an EPIRB or liferaft at 1.5 to 4 m depth.
Hydrostatic Release Unit (HRU) Check X5. Marine Surveying and Inspection: Verification of HRU expiry on liferaft cradles.
Hydrostatic Release Unit (HRU) Deficiency X146. Port State Control Regimes, MoUs, and Inspection Systems: A common 11xxx PSC finding when liferaft HRUs are expired or improperly rigged.
Hydrostatic Table X5. Marine Surveying and Inspection: Tabulation of displacement and related data versus draft.
Hydrostatic Tables X115. Marine Bunker and Cargo Surveying: Vessel-specific tables relating draft to displacement, used to convert measured drafts into cargo weight in draft surveys.
Hydrothermal Vent D2. Hydrography, tides, waves, bathymetry and marine geology: Seafloor opening discharging geothermally heated water.
Hydrotreated Vegetable Oil (HVO) D6. Decarbonization, emissions and alternative fuels: Renewable diesel often used as drop-in marine fuel.
Hydroville X111. Methanol, Ammonia and Alternative Marine Fuels: 14 meter hydrogen dual-fuel crew shuttle launched by CMB.TECH in 2017 in Antwerp.
Hydroweld FS X92. Marine Steel Suppliers and Shipbuilding Plate: Branded family of underwater wet welding stick electrodes used by commercial divers.
Hydroxocobalamin (Cyanokit) X36. Shipboard Medical, Telemedicine and Seafarer Health: 5 g IV antidote for cyanide poisoning.
Hyflex propeller alloy X38. Propellers, Stern Gear and Shaft Lines: Trade designation for certain high-strength nickel-aluminum-bronze alloys used in propeller casting.
Hygiene Officer X36. Shipboard Medical, Telemedicine and Seafarer Health: Designated crew on cruise ships overseeing public-health sanitation under VSP/USPH.
Hygroscopic Cargo X1. Cargo Science, Commodities and Cargo Care: Cargo that absorbs and releases moisture with ambient humidity.
HyNet North West X57. Ocean Energy Beyond Wind: UK industrial cluster centered on the Liverpool Bay region with CO2 storage in depleted gas fields.
Hypatia de Alejandria X85. Ferries, Ro-Pax Operators and Routes: Balearia LNG dual-fuel ro-pax deployed on Balearic routes.
HyperBaric X124. Dredging Industry and Reclamation Contractors: DEME's experimental deep-sea mining dredging programme.
Hyperbaric Chamber X82. Saturation Diving and Offshore Diving Operations: Pressure vessel for human occupancy used in treatment or saturation.
Hyperbaric chamber (HSC) X170. SOLAS 1974 Convention: Chapter-by-Chapter Glossary: Not generally mandatory under SOLAS but addressed for diving-support vessels under IMO MSC/Circ.645.
Hyperbaric Evacuation X82. Saturation Diving and Offshore Diving Operations: Recovery of divers under pressure from a damaged DSV.
Hyperbaric Health Toronto X82. Saturation Diving and Offshore Diving Operations: Canadian hyperbaric medicine clinic.
Hyperbaric Lifeboat X82. Saturation Diving and Offshore Diving Operations: Self-righting lifeboat fitted with a pressurized chamber for divers.
Hyperbaric Medicine X82. Saturation Diving and Offshore Diving Operations: Medical specialty using elevated pressure oxygen for treatment.
Hyperbaric Oxygen Therapy X82. Saturation Diving and Offshore Diving Operations: HBOT, clinical use of oxygen at greater than atmospheric pressure.
Hyperbaric Survey X43. Marine Surveying and Warranty Surveying: A specialist inspection of saturation diving systems, chambers, and life support equipment, often under IMCA standards.
Hyperbaric Welding X82. Saturation Diving and Offshore Diving Operations: Welding inside a dry habitat at ambient diver pressure.
Hyperchlorination X41. Cruise Ship Public Health and VSP/USPH: Elevated chlorine dose, typically 10 mg/L for new tank commissioning or 50 mg/L for emergency disinfection.
Hypergolic X75. IMDG Code, Classes, Packing and Segregation: Property of substances that ignite on contact, considered in special provisions for oxidizers and fuels.
Hyperion Class X64. Cruise Industry Operators, Brands and Ships: AIDA Cruises class including AIDAprima and AIDAperla.
HYPERSCALE Marine Spatial Plan X37. Marine Spatial Planning, Subsea Cables and Submarine Pipelines: Workshop name used in EU MSP capacity building.
Hypobromous acid X18. Ballast Water, Biofouling and Antifouling: Effective biocide formed when chlorine reacts with bromide in seawater electrochlorination.
Hypochlorite Dosing X63. Marine Auxiliary Machinery and Pumps: Continuous chlorine injection for biofouling control or potable water disinfection.
Hypochlorite Ion X41. Cruise Ship Public Health and VSP/USPH: Less biocidal form of chlorine that predominates above pH 7.5 in alkaline pool water.
Hypochlorite Solution UN 1791 X172. IMDG Code: Classes, Divisions, Segregation, and Key UN Numbers: A Class 8 corrosive liquid covering bleach solutions; packing group II or III based on available chlorine.
Hypochlorous acid X18. Ballast Water, Biofouling and Antifouling: Primary biocide in electrochlorination BWMS.
Hypothec X49. Ship Finance, Leasing and Maritime Capital Markets: Civil law equivalent of a mortgage, used in registries including Panama and Marshall Islands variants.
Hypothermia management X36. Shipboard Medical, Telemedicine and Seafarer Health: Passive and active rewarming protocols for cold-water casualties.
Hypothermic Survivor X80. Maritime Search and Rescue Coordination: Casualty with reduced core temperature requiring specialized recovery.
Hypoxia D3. Marine environmental science, pollution and conservation: Dissolved oxygen below threshold needed for many marine species, often less than 2 milligrams per liter.
HySeas III X111. Methanol, Ammonia and Alternative Marine Fuels: Hydrogen PEM fuel cell ferry development project for Kirkwall to Aberdeen service designed for around 1,000 passengers in hybrid hydrogen configuration.
Hyster X15. Ports, Terminals and Stevedoring: US manufacturer of forklifts and container handlers.
Hyster Big Trucks X94. Port Machinery and Quay Equipment Makers: Hyster heavy lift-truck line including the H1050HD top-lift container handler and the RS46 reach stacker.
Hyster top handler X76. Stevedoring, Lashing and Cargo Securing: Container handling truck used for empties or single laden boxes in terminal yards.
Hyster-Yale Materials Handling X138. Global Container Terminal Operators and Port Equipment: US-based forklift manufacturer producing reach stackers, empty handlers and Top-Pick truck handlers.
Hystra Consortium X140. Ammonia as Marine Fuel and Hydrogen Shipping: Kawasaki Heavy Industries, Iwatani, Shell Japan, J-Power, ENEOS, Marubeni, and K Line for the LH2 supply chain demonstration.
Hyuga class X11. Naval Vessels, Warship Systems and Naval Architecture: JMSDF DDH-181 helicopter destroyer with through-deck.
Hyuga-class helicopter destroyer X106. Naval Surface Combatants: JMSDF DDH class of two ships JS Hyuga DDH-181 commissioned 2009 and JS Ise DDH-182 commissioned 2011, displacing about 19,000 tons.
Hyundai E&C Marine X175. Port Engineering, Dredging, Breakwaters, and Quays: Marine engineering and dredging division of Hyundai Engineering and Construction of South Korea.
Hyundai Fortune fire (2006) X163. Marine Accident Investigation Agencies and Landmark Inquiries: Panama-flag container ship that suffered a major fire and explosion in the Gulf of Aden on 21 March 2006, investigated by the Panama Maritime Authority as flag State.
Hyundai Glovis X104. Project Cargo Forwarders and Heavy Transport: South Korean logistics company, the captive provider to Hyundai Motor Group.
Hyundai Heavy Industries X58. Shipbuilding Yards and Construction: HHI, Ulsan, world's largest shipbuilder by output.
Hyundai Heavy Industries (HHI) X20. LNG Operations and Custody Transfer: Korean shipbuilder; major LNG carrier yard alongside Samsung and DSME/Hanwha Ocean.
Hyundai Heavy Industries HHI HMRI X162. Naval Architecture, Stability, Resistance, and Structural Design: Hyundai Maritime Research Institute towing tank and cavitation tunnel in Ulsan, South Korea.
Hyundai HiMSEN B2. Marine Engineering: Brand of HHI medium-speed engines.
Hyundai HiMSEN H21/32 X67. Marine Electrical Systems and Shore Power: 21 cm bore HiMSEN engine commonly fitted as auxiliary on container ships and bulk carriers.
Hyundai HiMSEN H32/40 X67. Marine Electrical Systems and Shore Power: 32 cm bore HiMSEN engine used as main propulsion on small commercial vessels.
Hyundai HSME X90. Marine Engine Specific Model Enumeration: Hyundai Heavy Industries Engine & Machinery Division identifier used in MAN B&W two-stroke licensee references.
Hyundai Mipo X62. Naval Warships and Combat Systems: South Korean shipyard handling smaller commercial and naval vessels.
Hyundai Mipo Dockyard X29. Ship Sale and Purchase, Management Contracts and Valuation: HHI group yard specializing in medium range tankers.
Hyundai Samho Heavy Industries X29. Ship Sale and Purchase, Management Contracts and Valuation: HHI group yard building larger vessels.
Hyundai Translead X83. ISO Container Manufacturing and Leasing: US chassis and trailer manufacturer headquartered in San Diego, building intermodal chassis for the North American market.
Hyundai Utopia X134. LNG and LPG Carrier Operators and Containment Systems: LNG carrier of 138,000 m3 delivered 1994 by Hyundai Heavy Industries for KOGAS, first Korean built LNGC.
Hyundai Vinashin Shipyard X58. Shipbuilding Yards and Construction: Joint venture yard in Khanh Hoa, Vietnam, between HHI and Vinashin.
Hyundai Welding X92. Marine Steel Suppliers and Shipbuilding Plate: South Korean welding consumables brand producing SAW wires, FCAW wires, and SMAW electrodes.
Hyunmoo SLBM (submarine-launched variant) X91. Submarines and Submarine Cable Systems: South Korean ballistic missile variant deployable from KSS-III submarines.
Hyvinkaa X94. Port Machinery and Quay Equipment Makers: Finnish town and headquarters of Konecranes Plc.
Hywind X42. Offshore Wind Installation and Cable Lay: Equinor floating offshore wind technology using spar substructures, deployed at Hywind Demo, Hywind Scotland, and Hywind Tampen.
Hywind Scotland X42. Offshore Wind Installation and Cable Lay: World's first commercial floating offshore wind farm, operated by Equinor since 2017 off Peterhead.
Hywind Tampen X42. Offshore Wind Installation and Cable Lay: Floating wind farm in Norwegian waters supplying power to the Snorre and Gullfaks oil and gas fields.