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Encyclopedia of Marine Technology


122 results

IBC Code

see International Bulk Chemical Code.

Ice belt

The ice-strengthened area of the shell plating, usually divided into the forward region, the midship region and the aft region.

Ice class

A class notation given to vessels, which have additional strengthening to enable them to operate in ice bound regions.

Ice class rules

For the operation in the Baltic, the Finnish-Swedish Ice Class Rules (FSICR) and the Russian Maritime Register (RMR) Ice Class Rules (Non-Arctic Sea Area Requirements) are applied.

Ice strengthening

Ships intended for navigation in ice conditions are specially reinforced. Ice strengthening concerns the side shell structure, stem, stern frame steering gear, propeller and shafting.

Ice thickness

Temperature in the Baltic, typically –15°C. Temperature in the Artic, down to –40°C.


A vessel used for keeping a navigable passage open through ice. Icebreakers are grouped in ice classes according to the thickness of the ice to be broken.

Icebreaker/offshore vessel BOTNICA

Finland is entirely dependent on icebreakers to keep its trade routes open in winter. Icebreakers are normally in operation from mid November until the end of May.


VITUS BERING is the icebreaking platform supply and emergency rescue vessel built by Arctech shipyard at Helsinki.


An azimuthing, pulling thruster developed by Wärtsilä and designed to 1A Super Ice Class or higher standards.


Icing caused by freezing sea spray or snow forming a layer of ice on deck and superstructure when operating in low temperatures may have major impact on the safety and general operation of a vessel.


A graphic symbol.

I-core panels

Laser-welded sandwich panels, developed by Macor Neptun and Meyer Werft, used as a deck construction material.


The setting on fire of an explosive mixture, usually within an engine cylinder.

Ignition delay

The period between the beginning of fuel injection into an engine cylinder and the begining of combustion.


The amount of light falling on an object or surface. Illuminance is measured in units of Lux (lm/m2).


The change in draught resulting from the addition or removal of the particular mass. In SI system it is called tonnes per centimetre immersion, TPC.

Immersion suit, also survival suit

A protective suit that reduces the body heat-loss of a person wearing it in cold water, e.g. when rescuing someone from the sea.


see International Maritime Organization.

IMO Data Collection System “DCS”:

IMO Data Collection System “DCS” defines data that the IMO mandates shipowners collect and report each calendar year.

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