Shipping Vocab Flashcards
Aframax
A system of sizing and freight rate assessment used by the London Tanker Brokers Panel Ltd. known as AFRA (average freight rate assessment). It is used to determine the average cost per ton for various size vessels on a monthly basis. An Aframax-size vessel is in the range of 80,000-130,000 DWT, either crude or product carrier.
API
American Petroleum Institute
API Gravity
An arbitrary expression of the weight of a product created by the API. API gravity is equal to (141.5/SG@60deg Fahrenheit)-131.5
API Tables
Eleven volumes of tables developed by the API to derive the necessary information to perform a cargo calculation.
Arrival ballast or “clean” ballast
The term is traditionally used on crude carriers to describe seawater introduced into cargo tanks that have been crude-oil-washed and water-rinsed. When discharged to the harbor through an oil content monitor, this ballast should not produce a visible sheen. the oil content of such ballast must not exceed 15 ppm.
Ballast
Seawater introduced into compartments on a tank vessel for the return leg of a voyage to the loading port. It is the additional weight necessary to bring the vessel to a suitable draft and trim and to reduce stresses and improve stability.
Barrel (bbl)
Equivalent to 42 gallons
Barrel, gross
The volume of cargo at the observed temperature in the tank.
Barrel, net
The volume of cargo corrected to a standard temperature of 60 degrees.
Bellmouth
The terminal end of the bottom piping in each tank, through which the tank is loaded and discharged. It’s shape is usually flared to approximately 1.5 times the original pipe diameter.
Bending stress
The stresses resulting from a concentration of weight at a certain location in the hull (uneven load) as well as from the motion of the vessel in a heavy seaway. On a tank vessel bending stress is commonly referred to as a hogging or sagging condition.
Benzene
An aromatic hydrocarbon with the composition C6H6. It is a regulated cargo (refer to Title 46 CFR Part 197) that requires special handling and safety measures designed to minimize the risk of exposure to vessel personnel.
Blank (blind flange)
A solid steel disk or plate used to cover and seal the end of a pipeline such as the cargo manifold.
Boiling point
The temperature at which the vapor pressure of a substance is equal to atmospheric pressure.
Bph
Barrels per hour
Bpt
Barrels per ton
BS&W
Bottom sediment and water
Bursting pressure
A pressure rating typically assigned to cargo and vapor houses.
Butterworth
A brand name of tank cleaning equipment. it is a term commonly used to describe portable tank cleaning equipment and he process of water-washing (Butterworthing) tanks.
CFR
Code of Federal Regulations
Cloud point
The temperature at which wax and other solid substances begin to separate from the liquid when an oil is cooled under specified conditions.
Coatings
Protective paints or linings applied to the surfaces of a tank to extend the surface life of the steel. The use of coatings has been found to facilitate cleaning and reduce the quantity of scale in cargo tanks.
Cofferdam
A void or empty space used to physically separate the cargo and noncargo areas of a tank vessel.
COI
Certificate of inspection