Extended Operational and Trade Vocabulary

IBC Code and Chemical Tanker Operations glossary

The chemical-tanker vocabulary anchored in the IBC Code: the carriage types (Type 1 to 3) and MARPOL Annex II pollution categories (X, Y, Z), named cargoes with their UN numbers and tank-material requirements (316L stainless for acetic acid), and the segregation and inerting terms. Grounds each term in the IBC Code carriage requirement or the cargo it names.

247 defined terms.

A

Acetic Acid: Carboxylic acid CH3COOH transported under the IBC Code as a Type 3 ship cargo, MARPOL Annex II Category Z, requiring stainless steel 316L tank construction due to severe corrosion of carbon steel.
Acetic Anhydride: Organic anhydride (CH3CO)2O assigned UN 1715, carried as a Type 2 ship cargo, Category Y under MARPOL Annex II, reactive with water and requiring dry inert atmosphere.
Acetone: IBC Code noxious liquid (Chapter 17), flammable solvent carried in chemical tankers.
Acetone Cyanohydrin: Highly toxic organic cyanohydrin requiring Type 1 ship carriage under the IBC Code due to extreme inhalation toxicity and Category Y status.
Acrolein Inhibited: Aldehyde requiring inhibitor and Type 1 ship carriage owing to extreme toxicity, polymerization risk, and Category X classification under Annex II.
Acrylic Acid Inhibited: Reactive monomer CH2CHCOOH assigned UN 2218, polymerization-prone, requires Type 2 ship, Category Y, inhibited with MEHQ at vendor-specified concentration.
Acrylonitrile: Nitrile CH2CHCN carried as a Type 2 ship cargo, Category Y under Annex II, inhibited monomer with strict inhalation toxicity controls under Chapter 15.
ADCA Sun: Tradename associated with the Marineline 784 advanced polymer coating system marketed by Advanced Polymer Coatings for chemical cargo tanks.
Alfa Laval: Swedish manufacturer of marine centrifugal separators including the MAB, MAPX, MMPX, MOPX, S, and P-Flex ranges.
Alkyl Phosphites: Group of organophosphorus compounds typically requiring Type 1 ship carriage under the IBC Code owing to their high marine and human toxicity profile.
Aluminum Tanks: Cargo containment material permitted under IBC Code Chapter 6 for specific cargoes incompatible with steel, subject to chloride and mercury exclusion.
Aniline: Aromatic amine C6H5NH2 assigned UN 1547, carried as a Type 2 ship cargo, Category Y under Annex II, with strict skin absorption precautions.
Annex II: Regulations for the Control of Pollution by Noxious Liquid Substances in Bulk.
Apple Juice Concentrate: Edible liquid product carried in stainless steel parcel tanker tanks under hygienic protocols and classed under Other Substances.
ASNT NDT Inspector: Coating and weld inspector certified by the American Society for Nondestructive Testing, frequently engaged for chemical cargo tank surveys.

B

Bahri: Saudi Arabian state-linked operator of one of the world's largest chemical tanker fleets, headquartered in Riyadh.
BCH Code: Bulk Chemical Code, the predecessor instrument to the IBC Code applying to chemical tankers constructed before 1 July 1986.
Benzaldehyde: Aromatic aldehyde C6H5CHO historically classified under MARPOL Annex II among higher hazard liquids and subject to discharge controls.
Benzene: IBC Category Y, toxic aromatic; vapor monitoring required.
Bioaccumulation: Buildup of substances in an organism over time.
Blanketing: Continuous supply of inert gas, typically nitrogen, maintained over a cargo to prevent oxidation or contamination during the voyage.
Butterworth Machine: Brand of portable and fixed tank cleaning machines historically associated with Butterworth Systems Inc., widely used aboard tankers.
Butyl Acrylate Inhibited: Acrylate monomer assigned UN 2348, Type 2 ship, Category Y under Annex II, requiring polymerization inhibitor with shipper-issued Inhibitor Certificate.

C

Canola Oil: Refined rapeseed oil carried as a Category Y vegetable oil under Annex II, classed as a Type 2 ship cargo under the IBC Code.
Carbon Steel Tank: Cargo tank constructed from mild steel, permitted under Chapter 6 with appropriate coating, or uncoated for a limited list of cargoes.
Carbozinc 11: Inorganic zinc silicate coating produced by Carboline used in cargo tanks intended for vegetable oils and certain mineral cargoes.
Cargo Containment: Subject of IBC Code Chapter 4 covering tank type, integration with hull, and minimum design pressure requirements.
Cargo Heater Unit: Skid-mounted heat exchanger heating cargo by recirculation through steam or thermal oil, an alternative to tank-mounted coils.
Cargo Heating: Subject of IBC Code Chapter 7, covering temperature control of cargoes by steam coils, thermal oil, or electric heating.
Cargo Pumps: Subject of IBC Code Chapter 5, prescribing requirements for transfer machinery including submerged hydraulic deepwell pumps.
Cargo Tank Coating: Lining applied to chemical or product tanker tanks, typically pure epoxy, phenolic epoxy, or inorganic zinc silicate depending on cargo compatibility.
Cargo Tank Venting: Subject of IBC Code Chapter 8, covering pressure/vacuum valves, high-velocity vents, and gas-freeing arrangements.
Cargo Temperature Control: Function regulated under Chapter 7 of the IBC Code addressing heated and cooled cargoes during loaded passage.
Cargo Transfer: Subject of IBC Code Chapter 5, covering piping, pumping, manifolds, and segregation between incompatible cargoes.
Category OS: MARPOL Annex II designation for Other Substances such as water and certain food-grade liquids judged to present no harm to the marine environment.
Category X: MARPOL Annex II classification for noxious liquid substances presenting a major hazard, discharge of which to the sea is prohibited.
Category Y: MARPOL Annex II classification for noxious liquid substances presenting a hazard, with discharge restrictions including pre-wash conditions.
Category Z: MARPOL Annex II classification for noxious liquid substances presenting a minor hazard, with the least restrictive discharge regime.
Caustic Soda Solution: IBC Category Y; corrosive, common chemical tanker cargo.
CDI: Chemical Distribution Institute, ship-inspection scheme for chemical and gas tankers.
CDI-M: The marine inspection scheme operated by the Chemical Distribution Institute for chemical and gas tankers, complementary to SIRE for those trades.
Cefitra: Brazilian chemical tanker operator providing coastal and short-sea transportation services along the South American Atlantic coast.
Chapter 1: IBC Code general chapter setting out application, definitions, surveys, and certification.
Chapter 10: IBC Code chapter on electrical installations in hazardous areas.
Chapter 11: IBC Code chapter on fire protection and fire extinction.
Chapter 12: IBC Code chapter on mechanical ventilation in the cargo area.
Chapter 13: IBC Code chapter on instrumentation including level, temperature, and pressure gauging.
Chapter 14: IBC Code chapter on personnel protection including protective equipment and safety showers.
Chapter 15: IBC Code chapter on special requirements applicable to individual substances listed in the cargo summary table.
Chapter 16: IBC Code chapter on operational requirements applicable to chemical tankers.
Chapter 16A: IBC Code chapter introducing additional measures for the carriage of toxic substances.
Chapter 17: IBC Code chapter containing the Summary of Minimum Requirements table for individual products.
Chapter 18: IBC Code chapter listing products to which the IBC Code does not apply.
Chapter 19: IBC Code chapter providing an index of products carried in bulk.
Chapter 2: IBC Code chapter on ship survival capability and the location of cargo tanks, including the Type 1/2/3 ship hierarchy.
Chapter 21: IBC Code chapter establishing criteria for assigning ship type to a given cargo.
Chapter 3: IBC Code chapter on ship arrangements, including segregation of cargo and accommodation spaces.
Chapter 4: IBC Code chapter on cargo containment requirements including tank types.
Chapter 5: IBC Code chapter on cargo transfer systems.
Chapter 6: IBC Code chapter on materials of construction for cargo tanks, piping, and fittings.
Chapter 7: IBC Code chapter on cargo temperature control.
Chapter 8: IBC Code chapter on cargo tank venting and gas-freeing arrangements.
Chapter 9: IBC Code chapter on environmental control of cargo tanks, including inerting and padding.
Chemical Distribution Institute: A non-profit organization headquartered in The Hague that operates marine and packed-cargo inspection schemes for the chemical industry.
Chloroform: UN 1888, Class 6.1 toxic liquid Packing Group III.
Cido Shipping: Singapore-based shipping group with interests in chemical tanker tonnage operating in regional and deep-sea trades.
CMVP: NIST and CCCS Cryptographic Module Validation Program; current Go FIPS module is CMVP certificate 5247.
Coconut Oil: Vegetable oil expressed from copra, carried as a Category Y cargo under Annex II, Type 2 ship under the IBC Code.
Crude Palm Oil: Unrefined palm oil pressed from the mesocarp of Elaeis guineensis fruit, carried as a Category Y vegetable oil.

D

Damage Stability: Required for passenger and cargo ships under SOLAS II-1, Parts B-1 and B-2.
Deck Water Seal: Component of an inert gas system that prevents back-flow of hydrocarbon vapor from the cargo tanks into the inert gas plant.
Deepwell Pump: Submerged pump for chemical and product tankers.
Diisooctyl Acid Phosphate: Organophosphorus liquid assigned UN 1902, carried under the IBC Code with restrictions reflecting its toxicity profile.
Double Side: Hull arrangement with an inner skin separated from the shell plating, required for Type 1 and Type 2 ships under Chapter 2.
Double-bottom: Structural arrangement providing tanks below cargo holds.
Duplex 2205: Austenitic ferritic stainless steel UNS S32205 widely used for chemical tanker cargo tanks.

E

Eitzen Chemical: Norwegian chemical tanker operator with a fleet primarily engaged in deep-sea parcel trades.
Electric Heating Coil: Cargo heating element comprising sheathed resistance elements used aboard tankers carrying small parcels of specific cargoes.
EMSA: European Maritime Safety Agency, supporting Paris MoU and EU Member States on PSC.
Environmental Control: Subject of IBC Code Chapter 9 covering inerting, padding, and venting controls for individual cargo tanks.
Epoxy phenolic: Tank-lining chemistry providing solvent resistance for product tankers.
Ethanol: Class 3 flammable; carried in product or chemical tankers; needs dry tanks.
Ethyl Acrylate Inhibited: Acrylate monomer assigned UN 1917, Type 2 ship, Category Y, requiring polymerization inhibitor with valid Inhibitor Certificate.
Ethylene Glycol: IBC Category Y; common chemical tanker cargo.

F

Flame screen: Mesh in cargo tank vent outlets that arrests flame propagation into the tank.
Formaldehyde Solution: Aqueous solution of methanal HCHO assigned UN 1198, carried under the IBC Code as a Type 2 or Type 3 cargo depending on concentration.
Formic Acid: UN 1779, Class 8 corrosive with Class 3 subsidiary risk.
Framo: Norwegian manufacturer originally founded by Frank Mohn, supplying hydraulically driven submerged cargo pumps widely used aboard chemical tankers.
Frank Mohn: Norwegian engineer who founded the Framo company manufacturing hydraulic submerged cargo pump systems for chemical tankers.

G

Gas Freeing: Replacement of hydrocarbon vapor with inert gas then air to allow tank entry.
GESAMP: Joint Group of Experts on the Scientific Aspects of Marine Environmental Protection.
GESAMP Hazard Profile: Multi-column evaluation of a substance's bioaccumulation, aquatic toxicity, human toxicity, irritation, and inhalation hazards.
GESAMP/EHS Working Group: Working group within GESAMP evaluating Environmental Hazards of Harmful Substances carried by ships.
Glycerine: IBC Category Y; oleochemical cargo.

H

Hansa Tankers: German chemical and product tanker operator managing a fleet of vessels in European and intercontinental trades.
Hempadur 35760: Hempel epoxy phenolic cargo tank coating in the Hempadur series.
Hempadur 35770: Hempel epoxy phenolic cargo tank coating designed for resistance to a range of chemical cargoes.
Hempadur 85671: Hempel epoxy phenolic cargo tank coating used in chemical and product tanker tanks.
Hempaline Defend 630: Hempel chemical-resistant coating in the Hempaline Defend product range used in industrial linings.
Hempaline Defend 700: Hempel chemical-resistant coating used in tank lining applications including selected cargo tank services.
Hempel: Danish marine coatings manufacturer founded in 1915 by J.C. Hempel, headquartered in Lyngby.
Hexachlorobutadiene: Halogenated hydrocarbon classed as a high hazard cargo under the IBC Code typically requiring Type 1 ship carriage.
High-Velocity Vent Valve: Tank vent designed to discharge vapor at a minimum 30 m/s exit velocity to ensure dispersion away from the deck.
Hydrochloric Acid: Class 8 corrosive; chemical tanker cargo.
Hydroquinone Monomethyl Ether: Chemical inhibitor commonly abbreviated MEHQ used to stabilize acrylate and methacrylate monomers during carriage.

I

IBC Code: International Code for the Construction and Equipment of Ships Carrying Dangerous Chemicals in Bulk.
ICS: International Chamber of Shipping, industry body.
IG System: Inert gas plant maintaining tank atmosphere oxygen below 8 percent and slight positive pressure to suppress flammability.
IMO Grade: Hazard ranking entry within the IBC Code Chapter 17 summary table indicating the ship type required for a given product.
Inert gas: nitrogen or flue gas blanketing chemical or oil tanks during transfer.
Inhibitor Certificate: Document issued by the cargo shipper attesting the type, concentration, and expiry date of the polymerization inhibitor in a monomer cargo.
Inhibitor Concentration: Active inhibitor level in parts per million stated on the Inhibitor Certificate and verified prior to loading.
Inhibitor Expiration: Date beyond which the polymerization inhibitor in a monomer cargo is considered ineffective, requiring re-inhibition or discharge.
Inhibitor Type: Specific chemical species used to inhibit polymerization, commonly tert-butylcatechol or hydroquinone monomethyl ether.
Instrumentation: Subject of IBC Code Chapter 13, covering level, pressure, temperature, and other measurement systems within cargo tanks.
Interline 9001: AkzoNobel International product range tank coating used for chemical and product tanker cargo tanks.
International Paint: AkzoNobel marine and protective coatings brand, formerly International Paint Ltd, based in Gateshead, United Kingdom.
Intertank 268: AkzoNobel International product range tank coating offered for chemical tanker service.
Isopropanol: Alcohol (CH3)2CHOH assigned UN 1219, carried as a Type 3 ship cargo, Category Y under MARPOL Annex II.

J

Jotun: Norwegian coatings manufacturer founded in 1926 by Odd Gleditsch, headquartered in Sandefjord.

K

KCT: Kongsberg Cargo Temperature monitoring system used for cargo tank instrumentation aboard tankers.
Kongsberg Maritime: Norwegian supplier of bridge, automation and dynamic positioning systems.

L

Lard Oil: Animal fat derived from rendered pork, carried in bulk as a Category Y product under MARPOL Annex II.
Latex: Aqueous polymer dispersion such as natural or synthetic rubber latex assigned UN 1184 in certain regulated forms and carried under hygienic protocols.
Lecithin: Phospholipid mixture derived chiefly from soybeans, carried as a food-grade liquid under hygienic protocols.

M

Marflex: Netherlands-based manufacturer of hydraulically driven submerged cargo pumps for chemical and product tankers.
Marineline 784: Advanced Polymer Coatings cargo tank lining engineered for resistance to aggressive chemical cargoes.
MARPOL: International Convention for the Prevention of Pollution from Ships, 1973, as modified by the 1978 and 1997 Protocols; the IMO treaty governing marine pollution across six annexes.
MARPOL Annex II: Prevention of pollution by noxious liquid substances.
MEHQ: Hydroquinone monomethyl ether, a common polymerization inhibitor for vinyl and acrylate monomers carried as IBC Code cargoes.
Methacrylic Acid: Carboxylic monomer requiring polymerization inhibitor and Type 2 ship carriage with Category Y status under Annex II.
Methanol: IBC Category Y; flammable; common chemical tanker cargo.
Methyl Acrylate Inhibited: Acrylate monomer assigned UN 1919, Type 2 ship, Category Y, requiring inhibitor and valid Inhibitor Certificate.
Methyl Ethyl Ketone: MEK, UN 1193, Class 3 flammable liquid Packing Group II.
Methyl Methacrylate Monomer: Acrylate monomer assigned UN 1247, Type 2 ship, Category Y, inhibited with MEHQ at shipper-stated concentration.
Methylal: Acetal CH2(OCH3)2 assigned UN 1234, carried under the IBC Code subject to Chapter 15 requirements.
MOL Chemical Tankers: Japanese chemical tanker operator under the Mitsui O.S.K. Lines group operating a global fleet.
Molasses: Viscous edible-by-product; heated cargo on parcel tankers.
MSC.4(48): IMO Maritime Safety Committee resolution adopting the IBC Code in 1983 with entry into force in 1986.
MSC.460(101): IMO Maritime Safety Committee resolution adopting amendments to the IBC Code in 2019.
MSC.464(101): IMO Maritime Safety Committee resolution adopting further amendments to the IBC Code in 2020.

N

Naphthalene: Two-ring aromatic compound contributing to combustion soot in residual fuels.
Navig8 Group: Shipping pool operator with chemical and product tanker pools active in deep-sea trades.
Nickel Alloy Tank: Cargo containment material listed under IBC Code Chapter 6 for cargoes incompatible with stainless steel.
Nitrogen Padding: Practice of loading cargo under a nitrogen blanket and maintaining it during the voyage to prevent oxidation.
NLS: Noxious Liquid Substance, the MARPOL Annex II term for liquid cargoes evaluated for marine pollution risk.
NORSOK M-501: Surface preparation/coating standard.

O

O2 Analyzer: Instrument continuously measuring oxygen concentration in inert gas and tank atmospheres aboard tankers.
Odfjell: Norwegian deep-sea chemical tanker operator headquartered in Bergen with a global parcel tanker fleet.
Operational Requirements: Subject of IBC Code Chapter 16 covering procedures and operations applicable to chemical tankers.
Other Substances: MARPOL Annex II classification covering liquids judged not to be NLS and therefore outside the categorical discharge regime.

P

Padding: Introduction of inert gas above a loaded cargo to prevent oxidation, regulated under IBC Code Chapter 9.
Palm Kernel Oil: Vegetable oil extracted from the kernel of the oil palm fruit, carried as a Category Y cargo under MARPOL Annex II.
Palm Oil: Edible vegoil; carried at 32-40 C.
Personnel Protection: Subject of IBC Code Chapter 14 covering protective equipment, eyewash, and safety showers in the cargo area.
Phenguard 935: AkzoNobel International tank coating in the Phenguard range used in chemical cargo tank service.
Phenol Molten: UN 2312, Class 6.1 toxic substance Packing Group II.
Phosphoric Acid: Inorganic acid H3PO4 assigned UN 1805, carried under the IBC Code as a Category Z cargo with stainless steel containment.
Polymerization Inhibitor: Reactive species added at low concentration to monomer cargoes to prevent spontaneous polymerization during carriage.
Pre-Wash: Mandatory tank cleaning operation under MARPOL Annex II following discharge of certain Category X and Y cargoes.
Pres-Vac: Danish manufacturer of pressure/vacuum valves and high-velocity vents widely fitted aboard tankers.
Pressure/Vacuum Valve: Tank vent valve typically set near +1,400 mm Aq pressure and minus 350 mm Aq vacuum, protecting against tank over- or underpressure.
PSA Nitrogen Generator: Pressure Swing Adsorption nitrogen plant producing inert gas by adsorbing oxygen on molecular sieve beds.

R

Rapeseed Oil: Vegetable oil pressed from Brassica napus seeds, carried in bulk as a Category Y cargo under Annex II.
RBD Palm Oil: Refined Bleached Deodorized palm oil, the trade-standard refined grade carried in chemical and parcel tankers.
Recognized organization: RO, delegated to act on behalf of the flag state.

S

SAN-J: Tradename in the family of fixed tank cleaning machines historically used aboard tankers.
Scanjet: Swedish manufacturer of tank cleaning machines including the GP-44 model widely fitted aboard chemical tankers.
Scanjet GP-44: Fixed programmable tank cleaning machine produced by Scanjet for chemical and product tanker service.
Ship Type 1: IBC Code designation under Chapter 2 for vessels carrying the most hazardous cargoes, requiring the most stringent damage stability.
Ship Type 2: IBC Code designation under Chapter 2 for vessels carrying cargoes of intermediate hazard.
Ship Type 3: IBC Code designation under Chapter 2 for vessels carrying cargoes of least hazard among IBC Code products.
SIRE: The Ship Inspection Report Programme, established by OCIMF in 1993.
SIRE 2.0: Ship Inspection Report Programme, OCIMF, transitioned from VIQ7 to a behavior-based program in 2024.
Smit IGG: Inert gas generator product line associated historically with Smit Gas Systems used aboard tankers.
Sodium Hydroxide Solution: IBC Category Y; corrosive.
Soybean Oil: Vegetable oil pressed from soybeans, carried in bulk as a Category Y cargo under Annex II.
Stainless Steel 304L: Austenitic stainless steel grade UNS S30403 used in selected cargo tank and piping applications.
Stainless Steel 316L: Austenitic molybdenum-bearing stainless steel grade UNS S31603 widely used in chemical tanker cargo tanks.
Steam Heating Coil: Pipe coil installed in a cargo tank to heat viscous or congealable cargoes by saturated steam circulation.
Stolt Tankers: Chemical tanker operating arm of Stolt-Nielsen managing a global fleet of stainless-steel parcel tankers.
Stolt-Nielsen: Norwegian-listed shipping group whose Stolt Tankers division is one of the world's largest operators of chemical parcel tankers.
Stripper Pump: Small-capacity pump used to remove residual cargo from a tank after the main cargo pump has discharged the bulk.
Styrene Monomer: IBC Category Y; needs TBC inhibitor; polymerization runaway risk.
Submerged Hydraulic Pump: Cargo pump mounted at the bottom of a tank and driven by hydraulic fluid from a deck-mounted power pack.
Sulfuric Acid: Mineral acid H2SO4 assigned UN 1830, carried under the IBC Code with strict materials of construction requirements.
Sunflower Oil: Vegoil; carried in chemical tankers.
Super Duplex 2507: Stainless steel grade UNS S32750 used in highly corrosive cargo services for its strength and pitting resistance.
Svanehoj: Danish manufacturer of submerged and deepwell cargo pumps now part of the Alfa Laval group.

T

Tallow Oil: Animal fat product carried in bulk as a Category Y cargo under MARPOL Annex II.
Tankguard PE: Jotun cargo tank coating in the Tankguard series formulated for chemical and product tanker tanks.
Tankguard Plus: Jotun cargo tank coating in the Tankguard series engineered for an extended chemical resistance list.
Tankguard SF: Jotun cargo tank coating in the Tankguard series intended for solvent-free or low-emission application.
Tankguard Storage: Jotun cargo tank coating in the Tankguard series designed for storage tank service.
tert-Butylcatechol: Polymerization inhibitor commonly abbreviated TBC used to stabilize styrene and other vinyl monomers during carriage.
Tetrachloroethylene: Chlorinated solvent C2Cl4 assigned UN 1897, carried under the IBC Code subject to Chapter 15 requirements.
Tetraethyl Lead: UN 1649, Class 6.1 toxic liquid Packing Group I.
Thermal Oil Heating: Cargo heating method using a circulating heat transfer fluid rather than saturated steam, supplied to tank coils or external heaters.
Titanium Tank: Cargo containment material listed under IBC Code Chapter 6 for highly corrosive cargoes incompatible with stainless steel.
Toftejorg: Brand of automated tank cleaning machinery, now part of Alfa Laval, including the TZ-89 model historically supplied to tankers.
Toluene: UN 1294, Class 3 flammable liquid Packing Group II.
Trimethylamine Solution: Aqueous tertiary amine solution assigned UN 1297, carried under the IBC Code with Chapter 15 special requirements.

U

UN 1090: Acetone Class 3 PG II.
UN 1114: United Nations number assigned to benzene under the UN Recommendations on the Transport of Dangerous Goods.
UN 1170: Ethanol Class 3 PG II or III.
UN 1184: United Nations number historically assigned to ethylene dichloride; reference here disambiguates between competing common assignments for latex.
UN 1193: United Nations number assigned to methyl ethyl ketone under the UN Recommendations on the Transport of Dangerous Goods.
UN 1198: United Nations number assigned to formaldehyde solutions, flammable, under the UN Recommendations.
UN 1219: United Nations number assigned to isopropanol under the UN Recommendations on the Transport of Dangerous Goods.
UN 1230: Methanol Class 3 with Class 6.1 subsidiary risk PG II.
UN 1234: United Nations number assigned to methylal under the UN Recommendations on the Transport of Dangerous Goods.
UN 1247: United Nations number assigned to methyl methacrylate monomer, stabilized, under the UN Recommendations.
UN 1294: Toluene Class 3 PG II.
UN 1297: United Nations number assigned to trimethylamine, aqueous solution, under the UN Recommendations.
UN 1307: United Nations number assigned to xylenes under the UN Recommendations on the Transport of Dangerous Goods.
UN 1547: Aniline Class 6.1 PG II.
UN 1671: United Nations number assigned to phenol, solid, with the molten state carried under proper shipping name provisions.
UN 1715: United Nations number assigned to acetic anhydride under the UN Recommendations on the Transport of Dangerous Goods.
UN 1779: United Nations number assigned to formic acid under the UN Recommendations on the Transport of Dangerous Goods.
UN 1789: Hydrochloric acid Class 8.
UN 1791: Hypochlorite solution Class 8.
UN 1805: Phosphoric acid solution Class 8 PG III.
UN 1824: Sodium hydroxide solution Class 8.
UN 1830: Sulfuric acid with more than 51 percent acid Class 8 PG II.
UN 1832: United Nations number assigned to spent sulfuric acid under the UN Recommendations.
UN 1888: United Nations number assigned to chloroform under the UN Recommendations on the Transport of Dangerous Goods.
UN 1897: United Nations number assigned to tetrachloroethylene under the UN Recommendations.
UN 1902: United Nations number assigned to diisooctyl acid phosphate under the UN Recommendations.
UN 1917: United Nations number assigned to ethyl acrylate, stabilized, under the UN Recommendations.
UN 1919: United Nations number assigned to methyl acrylate, stabilized, under the UN Recommendations.
UN 2055: United Nations number assigned to styrene monomer, stabilized, under the UN Recommendations.
UN 2218: Acrylic acid stabilized Class 8 with Class 3 subsidiary risk.
UN 2348: United Nations number assigned to butyl acrylates, stabilized, under the UN Recommendations.
UN 2729: United Nations number assigned to hexachlorobenzene under the UN Recommendations.
UN 2761: Organochlorine pesticide solid toxic Class 6.1.
UN number: Number identifying dangerous goods under UN model regulations.
USCG Subchapter D: US Coast Guard regulations at 46 CFR Subchapter D governing tank vessels including chemical tankers.

V

Vapor Emission Control System: Equipment recovering or controlling cargo vapors during loading, mandated for benzene cargoes under USCG rules.
Vapor return line: Cargo gas return between ship and shore on tankers/gas carriers.
VECS: Vapor Emission Control System; the abbreviation used in US Coast Guard tank vessel regulations.
Vent Riser: Vertical extension of a tank vent piping arrangement raising the discharge point a defined height above the weather deck.
Vinyl Acetate Monomer: Vinyl ester assigned UN 1301, Type 2 ship, Category Y, inhibited monomer requiring an Inhibitor Certificate.
Vinylidene Chloride Monomer: Halogenated vinyl monomer assigned UN 1303, Type 2 ship, Category Y, inhibited cargo under Annex II.
VIQ: Vessel Inspection Questionnaire used in the OCIMF SIRE programme to structure ship inspections.

W

Womar Tankers: Chemical tanker pool operator providing commercial management for participating owners in international parcel trades.

X

Xylenes: UN 1307, Class 3 flammable liquid Packing Group II or III by flash point.

Z

Zinc Silicate Coating: Inorganic zinc-rich cargo tank lining used for compatibility with vegetable oils and selected mineral cargoes.