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- wash port
- openings in bulwarks to allow water on deck to flow overboard
- water ballast
- sea water taken on board to increase propeller submersion and improve stability especially during an unloaded voyage; it is usually carried in the double bottom forepeak and aftpeak tanks
- waterline
- the line at a ships side formed by the surface of water at a specific draught
- waterplane
- horizontal section of a ships hull at a particular depth
- watertight
- structure built or closed so that water cannot get in or out
- watertight doors
- vertical or horizontal sliding steel doors operated by hydraulic or electric power either locally or remotely; for sealing openings in watertight sub-division bulkhead
- water tube boiler
- one classification of steam boiler in which the water is confined to numerous steel tubes connected at their ends to steam drums and water drums; the hot gases coming from the combustion chamber are directed by baffles to pass through the water tubes nest several times before going up to the economiser and out to the atmosphere through the funnel; this design uses less water and the water tubes are capable of supporting far higher pressure than Scotch boilers
- watt
- the unit of power and is equal to joule per second
- weather deck
- the deck that is exposed to sea and weather
- web
- the wider plate-like section of a beam or frame
- web frame
- a built-up transverse frame to provide additional strength; usually made up of a web plate stiffened with face plate on its edge; for several regular side frames one web frame may be deployed to strengthen the shell plating
- welding
- the union of pieces of metal made liquid by heating or by pressure or both; types of welding include arc welding gas welding resistance welding friction welding plasma welding and electron beam welding
- wetted surface
- the external surface of a ships hull which is in contact with the water in which she is floating
- wharf
- structure built along the shore where ships may berth to load or unload cargo or for fitting and refitting ships
- wharfage
- 1. charges paid for the use of a wharf; 2. wharf facilities in a port
- wheel house
- an erection for housing the steering wheel and other navigational aids; serves as the navigation centre of a ship; sometimes written as wheelhouse
- whirlpool
- a small area in the water where there are strong currents moving in circles; this may cause steering difficulty
- whirlwind
- a small revolving wind storm that circulates rapidly around a low pressure centre
- wildcat
- cable lifter or sprocket wheel of windlass
- winch
- a machine for lifting and lowering cargo and for other purposes that cannot be handled by manual power; it consists of a drum or barrel around which a rope or cable is wound to achieve either a lifting or lowering motion; the drum rotates in a horizontal axis and may be powered by steam or hydraulic motor or electric motor
- wind force
- wind velocity based on Beaufort wind scale
- Wing in Ground
- a high speed aircraft-like craft flying at a short distance above sea surface; WIG in short
- wing tank
- tank that lies along the ships side
- without prejudice
- of insurance claim it means "no question asked"; e.g. paying a claim "without prejudice" means that although there is no strict liability under the terms of the insurance policy the insurer may decide to pay without contention on this occasion; however this settlement should not be used as a basis in the future when such similar claims arise
- Worldscale
- the code name for Worldwide Tanker Nomimal Freight Scale; this system brings out bi-annually revised scales of freights based on the cost of operating a standard tanker to and from some known ports
- worm gear
- a kind of gearing which consists of a worm engaging a worm wheel the axes of both are at right angles to each other; the worm being restricted by fixed bearings can only rotate without moving in an axial direction; the screw thread on the worm engages the teeth on the worm wheel and when rotated the worm pulls or pushes the worm wheel causing rotation; used when large speed reduction ratio is desired such as in electric winches capstans etc.
- wreckage
- 1. the remains of a ship that has wrecked or damaged; 2. the goods washed ashore from a wrecked ship
- W/T
- wireless communication
