Abbreviations & Definitions
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N CONT  North Continent 
n-Butanol  N-Butanol is a liquid alcohol, which is an important solvent for resins and lacquers. It is also used as raw materials for glycol ethers and acetate esters. 
n-Butene  Butenes are formed during the cracking of petroleum to produce gasoline; they can also be prepared commercially by the catalytic dehydrogenation of butanes. 
n.E.  not East of 
n.N.  Not North (of) 
N.R.  No risk until confirmed or Net Register or Northern Range (of Ports in US) 
n.S  not South of 
N.Y.T.  New York Standard Time 
N/A  North America or North Atlantic or Not absolutely or Nearest Approach or Not Available or Not Applicable or No Account or No Advice or Not Acceptable or Not Addressed 
N/A  Not applicable / Not acceptable / Not available 
N/B  Newbuilding or Northbound or Nota Bene 
N/B or NB  New building 
N/E or n.E  Not east of 
N/N or n.N  Not north of 
N/S or n.S  Not south of 
N/t  New terms (grain trade) 
N/W or n.W  Not west of 
NA  Not applicable / Not acceptable / Not available 
NA OR N/A  Not applicable / Not acceptable / Not available 
NAA  Not always Afloat 
NAABSA  Not Always Afloat but Safely Aground 
NAP  Naphta 
Naphtha  Naphtha is a petroleum distillate containing principally aliphatic hydrocarbons. It is the primary source from which petrochemicals are derived. 
Naphtha  A product of crude oil or condensate refining which boils in roughly the same range as motor gasoline. In general, the naphtha distillation range spans from a bit less than 100 F, the boiling point of pentanes, through 300-400 F, depending on the intentions and needs of the refiner. The trade refers to this entire C5 to 300-400 F cut as whole or full-range naphtha. Refiners often produce two separate naphtha cuts when they distill crude, a light and a heavy fraction. They have rule-of-thumb boiling ranges of C5 through 175-200 F and 175-200 through 300-400 F. Refiners obtain naphthas from conversion units in addition to the straight-run streams from crude distillation. Catalytic crackers and cokers, in particular, produce cracked streams which boil in the naphtha range. See light naphtha, heavy naphtha, hydrocrackate, naphthenic naphtha, paraffinic naphtha, and whole naphtha. 
Naphthalene  Naphthalene is a crystalline white solid hydrocarbon, with the empirical formula C10H8. It is volatile, forming a flammable vapor. It is predominantly manufactured from coal tar, and can be converted to phthalic anhydride for the manufacture of plastics, dyes (pigments) and solvents. Naphtalene used to be the intermediate for production of indigo-blue which was the dye to color the jeans. Naphtalene is also an intermediate for the production for chemicals in the leather industry. One of the major applications of naphtaline nowadays is a sulfonated form which is used as a fluidizer in concrete and gypsum improving flowability of the concrete mixture and ultimately increasing strength of the concrete structure. A more specific application of naphtalene is the use of it as a buildingblock to produce a synthetic lubricant for car-engines. It is also used as an antiseptic and insecticide, especially in mothballs.  
Naphthenes  Hydrocarbon molecules with a carbon ring structure similar to aromatics. Naphthenes have saturated bonds rather than the unsaturated ones which characterize aromatics. Reformers make aromatics, the high-octane components they intend to produce, most easily by desaturation naphthene rings. The "N" in PONA and N+A stands for naphthenes. 
Naphthenic  High in naphthene-ring content. Lower than ordinary paraffins concentration. In some casual applications this adjective tacitly embraces aromatics as well as naphthenes, as in naphthenic naphtha. 
Naphthenic naphtha  A naphtha stream with a comparatively high concentration of naphthenes and aromatics. The terms reforming naphtha and N+A naphtha also identify this class of hydrocarbons. In general, American and Japanese companies regard a stream as naphthenic or highly naphthenic if it has a naphthenes plus aromatics concentration of 40 percent or more. Europeans use a lower standard-in the mid-30's. Naphthenic naphthas normally find use as reformer feedstock. 
NARSUC  Navigation and Routing Sub-Committee 
National Strategy for Maritime Security  In December 2004 the President directed the Secretaries of the Department of Defense and Home- land Security to lead the Federal effort to develop a comprehensive National Strategy for Maritime Security, to better integrate and synchronize the existing Department–level strategies and ensure their effective and efficient implementation. The strategy includes eight supporting plans to address the specific threats and challenges of the maritime environment and combined they present a compre- hensive national effort to promote global economic stability and protect legitimate activities while preventing hostile or illegal acts within the maritime domain. 
Natural Antioxidant  An antioxidant which is naturally present in fat, e.g. tocopherols and tocotrienols. Their presence confers good keeping properties on the fat. Most vegetable oils have a relatively high content of tocopherol and tocotrienols. 
Natural gas  Colorless, highly flammable gaseous hydrocarbon consisting primarily of methane, ethane, and small amounts of heavier gaseous hydrocarbon compounds such as propane. Ethane and propane, also called natural gas liquids (NGL), are converted into ethylene and propylene by steam cracking. It is a type of petroleum that commonly occurs in association with crude oil. 
Natural gasoline  The pentanes-and-heavier fraction produced by processing wet gas in an LNG or LPG plant. Such materials can substitute for paraffinic naphthas in a number of uses including, depending on the qualities of individual streams, gasoline blending and steam cracker feedstock. 
Nautical Mile  Distance of one minute of longitude at the equator, approximately 6,076.115. The metric equivalent is 1852. 
Naval Cooperation and Guidance for Shipping (NCAGS)  It is a naval organization with members who are trained to establish and provide advice for safe pas- sage of merchant ships worldwide, during times of peace, tension, crisis and war. NCAGS personnel act as a liaison between military commanders and the civil authorities. During war, the NCAGS orga- nization may be responsible for establishing a convoy. 
Naval Small Craft  Any small undefined naval vessels 
Navigation  The art and science of conducting a ship safely from one point to another 
NAVTEX  Navigational Warning Service Receiver 
NB / N.B.  Nota Bene: "Now, pay attention to this!"
A way of steering readers' attention toward something particularly important. 
NBR  Nitrile-butadiene-rubber. A synthetic rubber used in many applications, including the automotive industry. 
NCB  National Cargo Bureau 
NCEC  National Chemical Emergency Centre 
NCITD  National Committee on International Trade Documentation. 
NCP  National Oil and Hazardous Substances Pollution Contingency Plan 
NCR  Non-conformance report (ISM) 
NCS  Norwegian Continental Shelf 
NCSA  North Coast South America 
NCV  No commercial value 
NDFCAPMQS  No Deadfreight For Charterers Account Provided Minimum Quantity Supplied 
NDV  Net deadweight 
NE  Not Exceeding 
NE  Not East (of) 
NEAP TIDES  The opposite to Spring Tides 
NEC  Not Elsewhere Classified 
Negative Stability  Ship Stability: Exists when G is above M. The vessel will list to either side and will not remain upright. A list due to a negative initial stability is known as an angle of loll. 
NEGOS  Negotiations 
Negotiable Instruments  A document of title (such as a draft, promissory note, check, or bill of lading) transferable from one person to another in good faith for a consideration. Non–negotiable bills of lading are known as “straight consignment.” Negotiable bills are known as “order b/l’s.” 
NEI  Not elsewhere included 
NEOBIG  Not East of but including Greece 
NEOBIGEAYF  Not east of but including Greece and excluding Albania, Yoguslavia and former Yoguslavia 
NEOBIGEYFY  Not east of but including Greece and excluding Yoguslavia and former Yoguslavia and Albania 
Neobulk  type of general cargo such as cars, timber, steel, etc.. 
NEP  Not elsewhere provided 
NES  Not Elsewhere Shown or Not Elsewhere Specified 
Nested  Articles packed so that one rests partially or entirely within another, thereby reducing the cubic–foot displacement. 
NESTING  Implies that cargo is presented stacked in the contour of similarly shaped cargo, it may be likened to a stack of plates 
Net Tare Weight  The weight of an empty cargo–carrying piece of equipment plus any fixtures permanently attached. 
Net Tonnage (NT, N.T. or nt)  A dimensionless index calculated from the total moulded volume of the ship's cargo spaces by using a mathematical formula. NT is based on a calculation of the volume of all cargo spaces of the ship. It indicates a vessel’s earning space and is a function of the moulded volume of all cargo spaces of the ship. A commonly defined measurement system is important; since a ship’s registration fee, harbour dues, safety and manning rules etc., are based on its gross tonnage, GT, or net tonnage, NT.

The net tonnage replaced the earlier net register tonnage (NRT) which denoted the volume of the ship's revenue-earning spaces in "register tons", units of volume equal to 100 cubic feet (2.83 m3).

Theoretically the cargo capacity of the ship. Sometimes used to charge fees or taxes on a vessel. The formula is(0.2+0.02 log10(Vc)) Vc (4d/3D)2, for passenger ships the following formula is added: 1.25 (GT+10000)/10000 (N1+(N2/10)), where Vc is the volume of cargo holds, D is the distance between ship’s bottom and the uppermost deck, d is the draught, N1 is the number of cabin passengers, and N2 is the number of deck passen- gers.) “Ton” is figured as a 100 cubic foot ton. An approximate conversion ratio is 1NT = 1.7GT and 1GT = 1.5DWT. 
Net Weight  Weight of the goods alone without any immediate wrappings, e.g., the weight of the contents of a tin can without the weight of the can. 
Netback  Calculating the FOB value or price of a hydrocarbon from prices or values at delivery points. The derivation involves subtracting various costs such as freight, handling, interest, duties, transit losses, and commissions from reports or estimates of outlet-market levels. 
Netlayer  A naval vessel for laying submarine nets from boom defences 
Nett Terms  Opposite to Gross Terms 
Neurotoxic  Capable of causing injury to the central nervous system (brain and spinal cord) and/or peripheral nervous system (nerves arising from the brain and spinal cord). Delayed neurotoxicity refers injury to the nervous system following a single exposure, but for which there is a significant latent period between exposure and the appearance of signs of a neurotoxic effect.  
Neutral Body  An organization established by the members of an ocean conference acts as a self–policing force with broad authority to investigate tariff violations, including authority to scrutinize all documents kept by the carriers and their personnel. Violations are reported to the membership and significant penalties are assessed. 
Neutral Oil  When a crude oil has been neutralised with an alkali, the residual material, i.e. crude oil less FFA, phosphatides, moisture and impurities, is then neutral oil. 
neutral stability  Ship Stability: Exists when G coincides with M. The vessel does not tend to return to an upright position if inclined, nor to continue its inclination if the inclining force is removed. 
Neutralization   The reduction of free fatty acids in a crude oil by the action of an alkali solution is ordinarily termed ""neutralisation"". 
New Worldscale  The Worldscale tanker rate schedule based on revised assumptions which take effect on January 1, 1989. 
Newbuilding  New ship under construction. 
NEWCI  Not east of West Coast Italy 
NEWCT  North East of West Coast Italy 
NFPA  National Fire Protection Association. This group of fire protection personnel established a rating system used on many labels of hazardous materials. This label consists of a diamond divided into four sections representing health, flammability, reactivity, and special precautions  
NG  Nigeria 
NGL  Natural gas liquid 
NGL  Natural gas liquids. Natural gas processing yields a variety of liquids which can range from ethane to field condensate. The specific liquids included under this designation differ from company to company and from one part of the industry to another. 
NGO  Non-Governmental Organization 
NHC  No heat crude 
NHP  Nominal horse power 
NI  Nautical Institute 
NIOP  National Institute of Oilseed Products 
NIOSH  National Institute of Occupational Safety and Health. This agency of the public Health Service tests and certifies respiratory and air-sampling devices. It recommends to OSHA exposure limits for hazardous substances. It also investigates incidents and researches occupational safety. 
Nippon Kaiji Kyokai (NK)  A Japanese classification society which certifies seagoing vessels for compliance to standardized rules regarding construction and maintenance. 
NIS  Norwegian International Ship Registry 
Nitrogen Oxides (NOx)  Environmentally-harmful gases formed by the engine’s combustion process 
NJ  New Jason clause in C/P 
NK  Nippon Kaiji Kyokai 
NK or NKK  Nippon Kaiji Kyokai 
NKORL  No known or reported loss 
NLS  Noxious Liquid Substance 
NM  Nautical mile 
NMD  Norwegian Maritime Directorate 
NMFC  National Motor Freight Classification. 
NMPD  Nautical miles per day 
NN  Pipe Tunnel (OCIMF acronym) 
NNGWB  Not north of George Washington Bridge (i.e. New York) 
NNOGWB  Not North Of George Washington Bridge 
NO  Number 
No Great Shakes  When casks became empty they were "shaken" (taken apart) so the pieces, called shakes, could be stored in a small space. Shakes had very little value. 
No oil  ASTM's grade of oil for commercial applications which benefit from heavy fuel but lack heated storage tanks. Refiners sell heavy distillate or a blend of distillate and residue as No. 4 oil. Medium-speed diesels can burn a version of this product designated No. 4-D. 
No Room to Swing a Cat  The entire ship's company was required to witness flogging at close hand. The crew might crowd around so that the Bosun's Mate might not have enough room to swing his cat o' nine tails. 
No-heart crude  Crude fluid enough at ambient temperature to permit transportation in vessels which cannot heat it. 
No. 2 oil  ASTM's designation for distillate fuel oil intended for burning in household and light commercial furnaces. A companion grade, No. 2-D, fuels high-speed diesel engines. The USA, which relies more than other countries on ASTM specs to define oil products, generally distributes just one kind of No. 2, a dual grade suited for diesels and burners. See gasoil. 
No. 5 oil  The ASTM grade of residue suitable for unheated storage in mild climates. 
No. 6 oil  Heavy fuel oil too viscous for burning without preheating. See residue. 
No–show  Cargo which has been booked but does not arrive in time to be loaded before the vessel sails. See also “Windy Booking.” 
NOA  Not overaged 
NOAA  National Oceanic and Atmospheric Administration 
NOBL  Not On Banned List 
NOC  Notice of cancellation 
NOE  Not otherwise enumerated 
NOEC  No observed effect concentration. The highest concentration of a material in a toxicity test that has no statistically significant adverse effect on the exposed population of test organisms compared with the controls. When derived from the life cycle or partial life cycle test, it is numerically the same as the lower limit of the matc. Also called no observed adverse effect level (NOAEL) or no observed effect level (NOEL). 
NOGRAIN  Grain Charter Party 
NOHP  Not otherwise herein provided 
NOI  Not Otherwise Indexed 
NOIBN  Not otherwise indicated by number, not otherwise indexed by name 
NOKUS - company  Norwegian controlled foreign company in lowtax country 
NOLA  New Orleans (Louisiana) 
NOM  Nominations 
Nomenclature of the Customs Cooperation Council  The Customs tariff used by most countries worldwide. It was formerly known as the Brussels Tariff Nomenclature and is the basis of the commodity coding system known as the Harmonized System. 
Nominated Vessel  The specific vessel which has been designated for a particular voyage. 
NON MECH  Non mechanical 
NON REV  Non Reversible 
Non-conformity  ISM definition of non-conformity: Non-conformity means an observed situation where objective evidence indicates the non-fulfilment of a specified requirement. Major non-conformity means an identifiable deviation that poses a serious threat to the safety  
Non-polar  See Immiscible 
NON-REVERSIBLE  then saved days will not be added to discharge time allowed. 
Non–Dumping Certificate  Required by some countries for protection against the dumping of certain types of merchandise or products. 
Non–Vessel Operating Common Carrier (NVOCC)  A cargo consolidator in ocean trades who will buy space from a carrier and sub–sell it to smaller ship- pers. The NVOCC issues bills of lading, publishes tariffs and otherwise conducts itself as an ocean common carrier, except that it will not provide the actual ocean or intermodal service. 
Nonconjugated Fatty Acids  Polyunsaturated fatty acids exhibiting pairs of carbons separated by at least one saturated carbon atom. 
NOP  Net Operating Profit or Not Otherwise Provided 
NOP  Normal Operating Power (service speed) 
NOPAC  North Pacific (Ports) 
NOR  Not Otherwise Rated 
NOR  Notice of readiness. Shall mean the notice to the charterer, shipper, receiver or other person as required by the Charter Party that the Vessel has arrived at the Port or Berth, as the case may be, and is ready to load or discharge. 
NOR T & A  Notice of Readiness tendered and accepted 
NORA  Notice of readiness accepted 
NORT  Notice of Readiness tendered 
Northern grade  Motor gasoline that meets Colonial pipeline specifications for product delivered to points north of Greensboro, North Carolina. Both distillation range and volatility differentiate Northern grade gasoline from Southern grade. Finished gasoline must be more volatile in certain states during winter months to assure proper ignition. In warm weather less volatile finished gasoline helps prevent autos from suffering vapor lock. During the months of March, May, September and November the quality specifications are the same for both Northern and Southern grades. 
NOS  Not otherwise shown/specified or Numbers 
Nose  Front of a container or trailer–opposite the tail. 
Noxious  Harmful to personnel or the environment. 
NPA  n-Propyl Alcohol 
NPCFB  North Pacific Coast Freight Bureau. 
NPK  Nitro Phosphatic Kompound 
NPL  Norwegian policy lomits 
NPRA  National Petrochemical & Refiners Association (USA) 
NRAD  No risk after discharge 
NRC  National Response Centre 
NRT  Net Restricted Tonnage 
NRT – Net Register Tons see “Net Tonnage”  Theoretically the cargo capacity of the ship. Sometimes used to charge fees or taxes on a vessel. 
NS  Non-Scoring or No Sparring 
NSF  Norwegian sales form 
NSPF  Not specially/specifically provided for 
NSPF  Not specially/specifically provided for 
NSW  New South Wales (Australia) 
NT  Net Tonnage or Neap Tides or Net Terms 
NTC  Not to count 
NTCEIU  Not to count, even if used 
NTCEUU  Not to count, unless used 
NUBALTWOOD  Timber Charter Party 
Nuclear Fuel Carrier  A cargo vessel arranged to carry nuclear fuel in flasks 
Nuclear Fuel Carrier (with Ro-Ro facility)  A nuclear fuel carrier which is loaded and unloaded by way of a ro-ro ramp 
Nuclear Magnetic Resonance  The phenomenon of nuclear magnetic resonance (NMR) occurs when an appropriate radio frequency field is applied to a sample containing dipolar nuclei (e.g. protons in fat) placed in a strong d.c. magnetic field. Low resolution NMR spectrometry is used to measure the solid fat content of fat samples and the oil content of seeds. The NMR spectra of triglycerides exhibit characteristic peaks each, produced by protons of different character and, for structural analyses, high resolution NMR spectrometers are required. 
NV  Norwegian Veritas 
NVIC  Navigation and Vessel Inspection Circular (USCG publication) 
NVOCC  Non-Vessel Operating Common Carrier 
NWE  North West Europe 
NWOBI  not west of but including 
NY or NYK  New York 
Nylon  A synthetic plastic material derived from benzene. Nylon can be used to form fibers, filaments, bristles, or sheets to be manufactured into yarn, fabric, and cordage; and it can be formed into moulded products. Nylon is tough, elastic and strong, and it has high resistance to wear, heat, and chemicals. It is generally known in the form of fine filaments in such articles as hosiery and sports equipment, e.g. parachutes; but its applications also include engineering plastics for cars, toys, healthcare products, carpets, roller-blade wheels, ship sails and parachutes. 
NYPE  New York Produce Exhange (charter party) 
NYSA  The New York Shipping Association