A propulsion system arrangement where the engine is directly coupled to the shaftline. It is usually applied on low-speed engines.

A refrigeration system in which the refrigerant expansion occurs due to the direct absorption of heat from the primary medium to be cooled.

This is electrical current that does not alternate, the electrons flow through the circuit in one direction.

An electronic power component which allows for a flow of current in one direction only; from anode to cathode.

A technique using digital codes. It enables a radio station to establish contact with, and transfer information to, other stations complying with the relevant recommendations of the International Radio Consultative Committee (CCIR).

Referring to data in numerical form.

A display in which the measured quantity is given in digital form.

A chamber, which surrounds the impeller of a centrifugal pump or a compressor, in which some of the kinetic energy of the fluid is converted into pressure energy due to an increasing cross-sectional area of the flow path.

An advanced form of GPS navigation which provides greater positioning accuracy than the standard GPS.

Electric propulsion with diesels used as prime movers. Diesel-electric drive takes less space than the equivalent direct-drive two-stroke engine allowing the aft section to be slimmer and giving better flow over the propeller.

When a fluid is allowed to expand without generating external work and no external heat transfer take place, a temperature change results.

There are construction details showing the combination of all structural fire protection materials.

A structure that projects into the water to a reasonable depth of water. It enables ships or boats to come alongside to load or discharge cargo or passengers.

Act of throwing cargo or equipment (jetsam) overboard in order to lighten the vessel or improve its stability in case of emergency.

A shutter or cover with louvers. It provides ventilation while restricting the entry of rain and wind.

The jacket cooling water system is used for cooling the cylinder liners, cylinder covers and exhaust valves of the main engine.

1. The passageways which surround the engine cylinders. 2. Steel support framework used to support offshore platform topsides.

see MOBILE OFFSHORE DRILLING UNITS.

A device which can lift weights or exert a large thrust in order to move or position some equipment. It is usually hydraulically operated.

Developed and patented by Ton Kooren, the president of Dutch Towage Company KOTUG, the Rotor Tug represents a new concept in tug design.