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Inerting means: (i) the introduction of inert gas into an aerated tank with the object of attaining an inert condition suited to a safe gassing-up operation. (ii) the introduction of inert gas into a tank after cargo discharge and warming-up with the object of:— (a) reducing existing vapor content to a level below which combustion cannot be supported if aeration takes place (b) reducing existing vapor content to a level suited to gassing-up prior to the next cargo (c) reducing existing vapor content to a level stipulated by local authorities if a special gas-free certificate for hot work is required — see gas-free condition.

Related Terms

BULK CARGO

Cargo such as oil, coal, ore, woodchips, etc. not shipped in bags or containers

BUBBLE POINT

The differential gas pressure at which the first steady stream of gas bubbles is emitted from a wetted filter element under specified test conditions.

TRAMP FREIGHTER

A cargo ship engaged in the tramp trade.

ARC

A flash, caused by an electric current ionizing a gas or vapor.

CROWN

The top of the piston in an internal combustion engine above the fire ring, exposed to direct flame impingement.

CAM

Eccentric shaft used in most internal combustion engines to open and close valves.

CAPACITY PLAN

A plan outlining the spaces available for fuel, cargo, ballast, fresh water, etc, with guides on weight and volume for spaces at various drafts and displacements

COMBI

Vessel designed for a combination of passengers, and different types of cargo.

DERRICK

A device for hoisting and lowering heavy weights, cargo, stores, etc

ALKALI

Any substance having basic (as opposed to acidic) properties. In a restricted sense it is applied to the hydroxides of ammonium, lithium, potassium and sodium. Alkaline materials in lubricating oils neutralize acids to prevent acidic and corrosive wear in internal combustion engines.
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