Plating forming the top of the double bottom.

The innermost plating forming a second skin of the ship hull.

Input surge current, inrush current or switch-on surge is the maximal instantaneous input current drawn by an electrical device when first turned on.

An inrush current limiter is a component used to limit inrush current to avoid gradual damage to components and avoid blowing fuses or tripping circuit breakers.

Any equipment deployed from the survey, towed or normally attached.

A steel plate of greater thickness which is fitted at a region of increased stress, e.g. hatch corner.

The total cumulative installed electricity generation capacity.

Instantaneous power in an electric circuit is the rate of flow of energy past a given point of the circuit.

The rate of discharge of oil in litres per hour at any instant divided by the speed of the ship in knots at the same instant.

The Institute of Electrical and Electronics Engineers (IEEE) is a professional association for electronic engineering and electrical engineering (and associated disciplines).

A London-based organisation formed in 1899 to promote the scientific development of all aspects of marine engineering.

A device which provides a measurement or indication of the quantity measured.

Compressed air which is suitable for use in pneumatic control equipment. It must be free of oil and dust and dry enough to ensure that no water condenses anywhere in the system.

Instrument transformers are high accuracy class electrical devices used to isolate or transform voltage or current levels.

A system designed to measure and display the state of a monitored parameter and which may include one or more of sensors, read-outs, displays, alarms and means of signal transmission.

A container insulated on its walls, roof, floor, and doors, to reduce the influence of external temperatures on the cargo.

The frame of a container constructed to hold one or more thermally-insulated tanks for liquids.

A flanged joint incorporating an insulating gasket, sleeves and washers to prevent electrical continuity between pipelines, hose strings or loading arms.

Materials used for insulating electrical wires and cables

Rockwool, polyurethane, Styrofoam, glass fibre or other material used for insulation.