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WÄRTSILÄ
Encyclopedia of Marine and Energy Technology

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137 results

Natural refrigerants

energy

Natural refrigerants are substances that serve as refrigerants in refrigeration systems.

Natural resource

energy

Natural resources are resources that exist without any actions of humankind.

Natural uranium

energy

Natural uranium refers to uranium with the same isotopic ratio as found in nature. It contains 0.711% uranium-235, 99.284% uranium-238, and a trace of uranium-234 by weight (0.0055%).

Natural-gas condensate

energy

Natural-gas condensate, also called natural gas liquids, is a low-density mixture of hydrocarbon liquids that are present as gaseous components in the raw natural gas produced from many natural gas fields.

Nautical chart

marine

A map of water area including the adjoining land, intended primarily for use of mariners.

Nautical mile

marine

Distance of one minute of longitude at the equator, equal to 1852m.

Naval architecture

marine

The science and practice of designing ships as distinguished from their construction which is covered to shipbuilding.

Navigating and manoeuvring workstation

marine

The main workstation on the bridge where speed and course are considered and controlled, preferably conceived for working in the seated position with optimum visibility and integrated presentation of information and operating equipment.

Navigation

marine

All tasks relevant for deciding, executing and maintaining the course and speed in relation to waters and traffic.

Navigation aids

marine

Magnetic compass, gyrocompass, radar, echo sounder, rudder angle indicator, propeller revolution counter, rate of turn indicator.

Navigation aids vessel

marine

A vessel intended for buoy handling.

Navigation lights

marine

All seagoing ships must be equipped with running and signal lights in compliance with the International Regulations for Preventing Collision at Sea (COLREG).

Navigator

marine

The person navigating, operating the bridge equipment and manoeuvring the ship.

NAVTEX

marine

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.

Near-isothermal

energy

Near-isothermal compression (and expansion) is a process in which a gas is compressed in very close proximity to a large incompressible thermal mass such as a heat absorbing and releasing structure (HARS) or a water spray.

Necking effect

marine

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.

Needle winding technology

energy

To efficiently wind the pole shoes lying close together of electronically commutated multipole three-phase motors, they will be coated with insulation and directly wound with the needle winding method.

Negative energy

energy

Negative energy is a concept used in physics to explain the nature of certain fields, including the gravitational field and various quantum field effects.

Negative geothermal gradient

energy

Negative geothermal gradients occur where temperature decreases with depth.

Net cutters

marine

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

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