Abbreviations & Definitions
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U-bend specimen  Horseshoe-shaped test piece used to detect the susceptibility of a material to stress corrosion cracking 
U.K.f.o.  United Kingdom for orders 
U.K.H.A.D.  United Kingdom and Le Havre-Antwerp-Dunkirk range 
U.K.H.H.  United Kingdom and Le Havre-Hamburg range 
U/C  Undercharge 
U/D  Under deck 
U/on deck  Under or on deck 
UAE  United Arab Emirates 
UBA  Umweltbundesambt (German Federal Environment Bureau) 
UCP  Uniform Customs and Practice for Documentary Credits: Published by the In- ternational Chamber of Commerce. This is the most frequently used standard for making payments in international trade; e.g., paying on a Letter of Credit. It is most frequently referred to by its shorthand title: UCP No. 500. This revised publication reflects recent changes in the transportation and banking industries, such as electronic transfer of funds. 
UER  Undesired Event Report 
UFC  Uniform Freight Classification 
UH  Upper hold 
UHF  Ultra High Frequency Band Radio 
UK  United Kingdom 
UK/CONT  United Kingdom / continent range 
UK/Cont (B.H.)  United Kingdom or Continent (Bordeaux-Hamburg range) 
UK/Cont (G.H.)  United Kingdom or Continent (Gibraltar-Hamburg range) 
UK/Cont (H.H.)  United Kingdom or Continent (Le Havre-Hamburg range) 
UKC  Under Keel Clearance or United Kingdom / Continent 
UKCS  United Kingdom Continental Shelf 
ULBC  Ultra Large Bulk Carrier 
ULCC  Ultra large crude carrier. The largest tankers. AFRA defines them as 320,000 DWT and larger. Most folks use the term a little less precisely. They might use it for ships as small as 300,000 or even 280,000 tons. 
Ullage  The difference between the total volume of a tank and the volume of the material it is presently holding. 
Ultraviolet Radiation  The visible light is only a small fraction of the spectrum of electromagnetic waves. Waves with wavelength shorter than the visible violet are generally called ""ultraviolet radiation"". Ultraviolet radiation is the electromagnetic wave in the range between the visible spectrum and x-rays. Both ultraviolet and infrared spectra are useful in the study of oils and fats. 
UMS  Unmanned Machinery Space 
UMS  Unleaded Motor Spirits 
UN  Shaft Tunnel (OCIMF acronym) 
UN Number (United National Serial Number)  These are assigned to cargoes by the United Nations Committee of Experts on the Transport of Dangerous Goods. 
UN/EDIFACT  United Nations EDI for Administration, Commerce and Transport. EDI Standards are developed and supported by the UN for electronic message (data) interchange on an international level. 
UNCITRAL  United Nations’ Commission on International Trade Law 
Unclaimed Freight  Freight that has not been called for or picked up by the consignee or owner. 
UNCTAD  United Nations’ Commission on Trade and Development 
UND  Undarker 
Under the Weather  If a crewman is standing watch on the weather side of the bow, he will be subject to the constant beating of the sea and the ocean spray. He will be under the weather. 
Undercharge  To charge less than the proper amount. 
Underkeel Clearance  the distance between the bottom of the ship and the sea or channel floor directly under the vessel 
Underwater System  An underwater system 
Underway  A vessel is underway when it is not at anchor, made fast to the shore, or aground. 
UNFCCC  United Nations Framework Convention on Climate Change 
Unicool  Barwil Unitor’s maritime refrigerants 
Uniform corrosion  Corrosion proceeding at almost the same rate over the whole surface of the metal exposed to the corrosive environment 
Uniform Customs and Practices for Documentary Credits (UCP)  Rules for letters of credit drawn up by the Commission on Banking Technique and Practices of the International Chamber of Commerce in consultation with the banking associations of many coun- tries. See Terms of Payment. 
Unit  A major piece of refining equipment. Any collection of machinery worthy of this title includes the complete set of hardware necessary to perform a process step. A crude distillation unit, for instance, incorporates a furnace, a fractionation tower, and all the pipes, pumps, and heat exchangers required to separate crude into cuts. 
Unit Load  Packages loaded on a pallet, in a crate or any other way that enables them to be handled at one time as a unit. 
Unit Train  A train of a specified number of railcars, perhaps 100, which remain as a unit for a designated destination or until a change in routing is made. 
Unitization  – The consolidation of a quantity of individual items into one large shipping unit for easier handling.
– Loading one or more large items of cargo onto a single piece of equipment, such as a pallet. 
UNL  Unleaded 
Unless Sooner Commenced  UNLESS SOONER COMMENCED shall mean that if turn-time has not expired but loading or discharging is carried out, Laytime shall commence. 
Unless sooner commenced, in which case actual time used to count  UNLESS SOONER COMMENCED, IN WHICH CASE ACTUAL TIME USED TO COUNT shall mean that actual time used during turn-time shall count as Laytime. 
Unless Used   UNLESS USED shall mean that if Laytime has commenced but loading or discharging is carried out during excepted periods, actual time used shall count as Laytime. 
Unloading  Removal of a shipment from a vessel. 
UNQT  Unquote 
Unsaponifiable Matter  The term refers to material present in oils and fats which, after saponification of the oil or fat by alkali, is extractable by solvent and remains nonvolatile on drying. Unsaponifiable matter generally constitutes less than 1% in most oils and fats. It consists of hydrocarbons, higher alcohols, sterols and tocopherols. 
Unsaturated Fatty Acids  Fatty acids containing one or more double bonds. Oleic, linoleic and linolenic acids are the most common naturally occurring unsaturated fatty acids in animal and vegetable fats and oils. 
Unsaturated Gases  Light ends produced by refinery cracking units, particularly catalytic crackers and cokers. “Unsaturated” indicates the high olefins content of these gases. They ordinarily go to their own separation unit, plainly labeled an unsaturate gas plant, to avoid contaminating the paraffinic, straight-run LPG which uses the saturate gas plant. 
Unsaturates  Hydrocarbons containing double or triple bonds. Olefins and aromatics which feature carbon-carbon double bonds have particular importance in the oil industry. 
Unseaworthiness  Unfitness of a ship for a particular voyage with a particular cargo. This can be a function of many variables, including but not limited to insufficient crew stores or fuel, machinery or equipment failure, or unfitness (unclean tanks) to receive or carry the cargo. 
uPES  Unsaturated Polyester Resins 
UPR  Unsaturated Polyester Resins. Durable, resinous polymers. They are used over a broad spread of industries, mainly the construction, boat building, automotive and electrical industries. In most applications they are reinforced with small glass fibers - hence these plastics are commonly referred to as GRP or Glass Reinforced Plastics.. 
Upstream  A relative term which locates one point closer to origins than another. Crude distillation lies upstream of conversion processing, for example. The opposite of downstream. 
Urea Carrier  A single deck cargo vessel for the carriage of urea in bulk. May be self discharging 
US  United States 
US Consular Invoice  A document required on merchandise imported into the United States. 
USA  United States of America 
USAC  United States Atlantic Coast 
USC  Unless sooner commenced 
USCG  United States Coast Guard 
USCG Number (US Coast Guard Number)  These are cargo compatibility groups assigned by the US Coast Guard in Code of Federal Regulations CFR 46 Part 150. 
USD  United States Dollar 
USDA  United States Department of Agriculture 
USEC  United States East Coast 
USFWS  United States Fish and Wildlife Service 
USG  United States Gulf of Mexico 
USNH  United States North of Cape Hatteras 
USNOPC  United States North Pacific 
USNP  United States North Pacific 
USP  US Pharmacopoeia 
USPE  Unsaturated Polyester Resins 
USPPI – United States Principal Party of Interest  The party that receives the primary benefit from an export transaction, usually the seller of the goods. 
USSA  United States Salvage Association 
USSH  United States South of (Cape) Hatteras 
USWC or USWE  United States West Coast 
UTC  Coordinated Universal Time (Greenwich Mean Time)  
Utility Vessel  A small multi functional response vessel not dedicated to a particular function 
UU  Unless Used 
UU/IUATUTC  Unless Used/If used (in which Case) Actual Time Used To Count 
UUATUTC  Unless Used (Which Case) Actual Time Used To Count 
UUIUATUTC  Unless Used If Used Actual Time Used To Count 
UUIWCTAUTC  Unless Used In Which Case Time Actually Used To Count 
UW  Underwriter(s). The party(s) who agrees to compensate another firm, usually a cargo owner or shipowner, for loss from an insured peril in consideration of payment of a premium.