Fluids causing damage by coming into contact with living tissues, the vessel or its cargo, when escaped from their containment.

A full hard coating or full hard coating supplemented by cathodic protection.

Inspection of welded joints is carried out by non-destructive methods, such as radiography, ultrasonic, magnetic particle or liquid penetrant.

The process in which a metal fractures prematurely in a transcrystalline manner under conditions of simultaneous corrosion and cyclic loading at lower stress levels or fewer cycles than would be in the absence of a corrosive environment.

- Excessive corrosion – An extent of corrosion that exceeds the allowable corrosion.

Any test that does not damage the material under test and can, therefore, be used on the finished items.

Petroleum having a flash point of 60°C or above, as determined by the closed cup method of test.

A valve that is designed to prevent a reverse flow. If the valve disc is not attached to the spindle, it is called a screw down non-return (SDNR) valve.

A type of grease which does not attack the seal.

A material which neither burns nor gives off flammable vapours in sufficient quantity for self-ignition when heated to approximately 750°C, this being determined in accordance with the Fire Test Procedures Code, (SOLAS).

A new mandatory code for the protection of seafarers against noise on board.

A point that is at rest in a vibrating body.

Not to be confused with nitric oxide (NO) or nitrogen dioxide (NO2), nitrous oxide (N2O) a potent greenhouse gas.

Nitric oxide (NO) and Nitrogen dioxide (NO2) are usually grouped together as NOx emissions.

Chemical tankers, gas carriers and reefer ships need clean, dry nitrogen for inerting, purging and cargo padding.

A synthetic rubber that is a copolymer of butadiene and acrylonitrile. It has good resistance to petroleum-based substances and is often used in seals.

A net protection ring with U-shaped cross-section. The net pick-up is the ancillary component of the sterntube aft seal and its purpose is to prevent netting and fishing lines from entering the seal.

Stainless steel net cutters are mounted on the rope guard, overlapping the propeller hub.

A term describing local corrosion at junction of plating and stiffeners due to flexure effects caused by reverse, cycling loading with loss of coating or shedding of scale exposing fresh steel to further corrosion.

An international maritime radio telex system sponsored by IMO and IHO, which automatically receives the broadcast telex information such as navigational, meteorological warnings and search and rescue (SAR) alerts on 24-hour watch basis.