85 Results
  • Wake

    Moving forward, a ship imparts the forward motion to the water at the stern. It is known as the wake

  • Wake equalization duct

    The propulsion improving device, especially for full block ships, developed by Professor Schneekluth.

  • Wake fraction coefficient

    The speed of advance of the propeller “VA” relative to the water in which it is working is lower than the observed...

  • Wake-field

    When the ship is sailing ahead, the friction of the hull will create a boundary layer of water around the hull.

  • Warping head, warping end, gypsy head

    A cylinder-like fitting at the end of winch or windlass shafts. The fiber line or wire rope is hauled or slacked...

  • Wash

    The waves and ripples spreading out from a vessel when underway.

  • Wash bulkhead

    A perforated bulkhead fitted into a cargo or deep tank to reduce the sloshing or the movement of liquid through...

  • Washing machines

    Tank washing machines either fixed or portable. They consist of revolving nozzles moved by water-driven gearing...

  • Waste

    Useless or superfluous matter which is to be discarded. Incineration of burnable waste is the most efficient means...

  • Waste heat boiler

    A boiler which uses the exhaust gas from an engine to produce low pressure saturated steam.

  • Waste heat recovery (WHR)

    The energy from the combustion process in an internal combustion engine not converted into useful work, e.g. energy...

  • Waste management plan

    Collection, treatment and disposal of waste.

  • Waste water

    Drainage from dishwater, showers, laundry, bath and washbasin drains and does not include drainage from toilets...

  • Waste water treatment systems

    Plants installed to treat any intended discharges overboard.

  • Watch

    A time period, usually of four hours, e.g. 12-4, 4-8, 8-12, which operates round the clock.

  • Watch alarm

    An alarm that is transferred from the bridge to the master and the backup navigator in the event deficiency (absence...

  • Watch alarm system

    The watch alarm system urges the officer on watch at a predetermined time to acknowledge his watch-keeping awareness.

  • Water curtain

    Some tankers have a fixed system to give a protective water curtain between the cargo deck and the superstructure.

  • Water fog

    A suspension in the atmosphere of water divided into coarse drops by delivery through a special nozzle for use...

  • Water level gauge

    A device to provide a visible indication of water level in the boiler.

Download the Encyclopedia