Moving forward, a ship imparts the forward motion to the water at the stern. It is known as the wake
The propulsion improving device, especially for full block ships, developed by Professor Schneekluth.
The speed of advance of the propeller “VA” relative to the water in which it is working is lower than the observed speed of the vessel “V”.
When the ship is sailing ahead, the friction of the hull will create a boundary layer of water around the hull.
A cylinder-like fitting at the end of winch or windlass shafts. The fiber line or wire rope is hauled or slacked by winding a few turns around it, the free end being held taut manually as it rotates
The waves and ripples spreading out from a vessel when underway.
A perforated bulkhead fitted into a cargo or deep tank to reduce the sloshing or the movement of liquid through the tank.
Tank washing machines either fixed or portable. They consist of revolving nozzles moved by water-driven gearing to create a spherical wash pattern or “cycle”.
Useless or superfluous matter which is to be discarded. Incineration of burnable waste is the most efficient means of disposal.
A boiler which uses the exhaust gas from an engine to produce low pressure saturated steam.
The energy from the combustion process in an internal combustion engine not converted into useful work, e.g. energy in the exhaust gas or cooling water.
Collection, treatment and disposal of waste.
Drainage from dishwater, showers, laundry, bath and washbasin drains and does not include drainage from toilets, urinals, hospitals and cargo spaces. Galley water can contain oil, fats and detergents...
Plants installed to treat any intended discharges overboard.
A time period, usually of four hours, e.g. 12-4, 4-8, 8-12, which operates round the clock.
An alarm that is transferred from the bridge to the master and the backup navigator in the event deficiency (absence, lack of alertness, no response to another alarm/warning, etc.), of any officer on watch.
The watch alarm system urges the officer on watch at a predetermined time to acknowledge his watch-keeping awareness.
Some tankers have a fixed system to give a protective water curtain between the cargo deck and the superstructure.
A suspension in the atmosphere of water divided into coarse drops by delivery through a special nozzle for use in fire fighting.
A device to provide a visible indication of water level in the boiler.