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An area onboard a tank vessel which, for the purposes of installing electrical devices is considered dangerous, and special approved equipment needs to be used.

Related Terms


The International Code for the Construction and Equipment of Ships carrying Dangerous Chemicals in Bulk. It includes an index of Dangerous Chemicals carried in bulk which is used when stowage planning these vessels. If a vessel was built after 01 July 1986 both the IBC code and the BCH code apply to the construction and equipment requirements.


For a fluid confined in a vessel, the rate of flow of heat out of the fluid, per unit area of vessel wall divided by the difference between the temperature in the interior of the fluid and the temperature at the surface of the wall. Also known as convection coefficient.


A vessel used to dissolve the smelt from the recovery boiler into a tank of water to produce green liquor.


An area generally outside port limits that is specifically designated as suitable for the transshipment of oil or other materials from large ships to smaller ones. As the purpose of transshipment is usually to reduce the draft of the larger vessel to allow her to proceed to port, the operation is often known as lightening and the area may be called lightening area or cargo transfer area


An area where a vessel anchors while satisfying quarantine regulations.


The system of valves and cargo lines in the bottom piping network of a tank vessel that connects one section of cargo tanks to another section.


An officially designated offshore area for the burning of chemical waste by specially equipped vessels. The depiction of incineration areas on charts (in conjunction with radio warnings) is necessary to insure that passing vessels do not mistake the burning of waste for a vessel on fire.


  1. Having freedom of motion interfered with by collision or entanglement; entangled; the opposite of clear. For instance, a rope is foul when it does not run straight or smoothly, and an anchor is foul when it is caught on an obstruction.
  2. A breach of racing rules.
  3. An area of water treacherous to navigation due to many shallow obstructions such as reefs, sandbars, or many rocks, etc.
  4. Foul the range: To block another vessel from firing her guns at a target.


Any ship which is required to be equipped with radio-telecommunication equipment in order to comply with the radio or radio-navigation provisions of a treaty or statute to which the vessel is subject.


Maritime area usually specified by range of ports in which a vessel may operate

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