D

205 Results
  • Dew point

    The temperature below which water vapour in the air condenses.

  • DF-electric concept, also dual-fuel/diesel-eletric propulsion

    The propulsion plant developed by Wärtsilä for LNG carriers. It is an electric propulsion with main generators...

  • Diaphragm

    1. A circular plate made up of two halves. It fits between the rotor wheels of a steam turbine and has nozzles...

  • Dielectric

    A solid, liquid or a gas in which electric field can be maintained with little or no external electrical energy...

  • Diesel Combined Cycle (DCC)

    Technology utilizing both the shaft output and thermal output of a diesel engine. The thermal output is used to...

  • Diesel engine

    A type of internal combustion engine which ignites fuel by injecting it into hot, high-pressure air in a combustion...

  • Diesel-electric propulsion

    Electric propulsion with diesels used as prime movers. Diesel-electric drive takes less space than the equivalent...

  • Differential Global Positioning System (DGPS)

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

  • Diffuser

    A chamber, which surrounds the impeller of a centrifugal pump or a compressor, in which some of the kinetic energy...

  • Digital

    Referring to data in numerical form.

  • Digital display

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

  • Digital selective calling (DSC)

    A technique using digital codes. It enables a radio station to establish contact with, and transfer information...

  • Diode

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

  • Direct Current (DC)

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

  • Direct drive

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

  • Direct expansion system

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

  • Direct Water Injection (DWI)

    The method used for reduction of NOx emissions by the injection of water directly into the combustion chamber via...

  • Direction of rotation of a propeller

    When viewed from astern, if the propeller revolves in a clockwise direction when going ahead, it is known as right-handed...

  • Direct-printing telegraphy

    Automated telegraphy techniques which comply with the relevant recommendations of the International Radio Consultative...

  • Disabled ship

    A damaged or impared vessel not able proceed by its own.

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