Rocks & mirror
WÄRTSILÄ
Encyclopedia of Marine and Energy Technology

R

251 results

Reagent

energy

A reagent is a substance or compound added to a system to cause a chemical reaction, or added to test if a reaction occurs.

Receiving point

marine

A mark or place at which a vessel comes under obligatory entry, transit, or escort procedure.

Rechargeable battery

energy

A rechargeable battery, storage battery, or secondary cell, is a type of electrical battery which can be charged, discharged into a load, and recharged many times, as opposed to a disposable or primary battery, which is supplied fully charged and discarded after use

Reciprocate

marine

An alternating motion between two extreme points on a fixed path, e.g. up and down motion.

Reciprocating engine

energy

A engine, also often known as a piston engine, is typically a heat engine that uses one or more reciprocating pistons to convert pressure into a rotating motion.

Reciprocating positive-displacement pumps

energy

Reciprocating pumps move the fluid using one or more oscillating pistons, plungers, or membranes (diaphragms), while valves restrict fluid motion to the desired direction.

Recloser

energy

In electric power distribution, automatic circuit reclosers are a class of switchgear which is designed for use on overhead electricity distribution networks to detect and interrupt momentary faults.

Recognised Organisation

marine

Recognised Organisation “RO”, an authorized organization that performs statutory requirements on behalf of a vessel’s flag state. While often a Classification Society, in the IMO DCS, independent verifiers are authorized by some flag states.

Recognized Security Organization (RSO)

marine

An organization with appropriate expertise in security and anti-terrorism matters recognized by the Administration and authorized by it to carry out assessment, verification, approval and certification activities...

Recommended exposure limit

energy

A recommended exposure limit is an occupational exposure limit that has been recommended by the United States National Institute for Occupational Safety and Health.

Record book of engine parameters

marine

The document for recording all parameters changes, including components and engine settings, which may influence NOx emission of the engine.

Rectification

energy

Power conversion from AC to DC.

Rectifier

energy

A rectifier is an electrical device that converts alternating current, which periodically reverses direction, to direct current, which flows in only one direction.

Recursion

energy

Recursion is a method of solving a problem where the solution depends on solutions to smaller instances of the same problem.

Redox

energy

Redox (reduction–oxidation) is a type of chemical reaction in which the oxidation states of atoms are changed.

Reducing valve

marine

A valve which is designed to maintain a lower constant fluid pressure at outlet, regardless of the inlet conditions.

Reduction

energy

Reduction is the gain of electrons or a decrease in the oxidation state of an atom, an ion, or of certain atoms in a molecule (a reduction in oxidation state).

Reduction gear, gearbox

marine

Equipment used to convert the output shaft revolutions of the main engine to those required to rotate the propeller.

Redundancy

marine

The provision of equipment or components which are surplus to operational requirements in order to continue operation after a failure.

Redundancy of propulsion

marine

Duplication of various machinery and systems forming a part of the propulsion system.

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