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WÄRTSILÄ
Encyclopedia of Marine Technology

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Abandonment

All operations required for breaking out stowage and the safe disengagement and clearing away of the life-saving equipment with full complement from the stricken ship.

Able-bodied seaman (A.B.)

A member of the deck crew who is able to perform all the duties of an experienced seaman; must have three years of sea service.

Abnormal condition

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

Abrasion

Scraping or wearing away, rubbing off.

Abrasion resistance

Resistance to frictional rubbing.

Abrasive

Agent used for blast cleaning before coating application.

Abrasive blasting

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

Absorbent material

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

Acceleration

The rate of velocity change or the average increase of velocity in a unit time, usually expressed in meters per square seconds (m/s2).

Accelerometer

A mechanical or electromechanical instrument that measures acceleration.

Acceptance tests, acceptance trials

A series of tests performed on a material, a machine or a system, in the presence of the purchaser or a surveyor to demonstrate suitable quality or operation.

Accessibility

The ability for personnel to access equipment easily that requires maintenance, inspection, removal or replacement while wearing the appropriate clothing, including personal protective equipment and using all necessary tools and test equipment.

Accident

An event that happens unexpectedly and causes damage, injury, etc.

Accident categories

(acc. to Lloyds Maritime Information Services casualty database) – The LMIS casualty database divides the accidents into the following categories:

Accommodation

The part of the ship which is used for cabins, dining areas and other crew facilities.

Accommodation ladder

A portable ladder hinged to a platform attached to the side of a ship and which can be positioned to provide access between ship and shore. Telescopic accommodation ladder is used for covering a long distance between the vessel and port quay.

Accumulation test of the boiler

A boiler test to ensure that the safety valves can release steam fast enough to prevent the pressure rising by 10%. The main steam stop valve is closed during the test.

Acetylene

A colourless, poisonous gas used with oxygen for oxy-acetylene metal welding or cutting.

Acquisition

The selection of the target vessels requiring a tracking procedure and the initiation of their tracking.

Act of God

An unpredictable situation which is beyond the power of man. A natural event, not preventable by any human power, such as flood, storms, or lighting usually quoted as “force majeure”.

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