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

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”.

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

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

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

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

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”.

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

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

A structure at the end of the vessel that allows only angular relative movement between the vessel and the mooring attachment to the seabed.

see Ship motions.

Zinc-filled paints based on an inorganic binder. Zinc silicates give very hard films, and are resistant to solvents.

A hard, white metal with a good resistance to atmospheric corrosion. It is used as a coating for steel in a process called galvanizing and also as an alloying element.

A housing with series of seal rings clamped into position on the bush. Sterntube seals have to perform two separate functions...

Substance that is able to take in moisture, oil, etc.

Cleaning of steel with abrasives propelled by compressed air jet preparatory to painting.

Agent used for blast cleaning before coating application.

Resistance to frictional rubbing.

Scraping or wearing away, rubbing off.

A condition that occurs in a process system when an operating variable (flow, pressure, temperature, etc.) ranges outside of its normal operating limits, (ABS).