WÄRTSILÄ
Encyclopedia of Marine and Energy Technology

F

327 results

Fan

marine

Generally applied to radial- and axial-flow blowers that increase the density of the air passing through them by a maximum value of 5%. Various types are in use, e.g. centrifugal, axial flow and propeller fans.

Fan coil

energy

A water or refrigerant coil through which air is circulated for conditioning.

Faraday cage

energy

A Faraday cage or Faraday shield is an enclosure used to block electromagnetic fields.

Faraday suit

energy

Some electrical linemen wear Faraday suits, which allow them to work on live, high-voltage power lines without risk of electrocution.

Fast breeder reactor

energy

Fast breeder reactor (FBR) which use fast (i.e.: unmoderated) neutrons to breed fissile plutonium and possibly higher transuranics from fertile uranium-238.

Fast neutron

energy

A fast neutron is a free neutron with a kinetic energy level close to 1 MeV (100 TJ/kg), hence a speed of 14,000 km/s, or higher

Fast-neutron reactor

energy

A fast-neutron reactor or simply a fast reactor is a category of nuclear reactor in which the fission chain reaction is sustained by fast neutrons (carrying energies above 0.5 MeV or greater, on average), as opposed to thermal neutrons used in thermal-neutron reactors.

Fathom

marine

A measure of length, equal to 6 linear feet, used for depths of water and lengths of anchor chain.

Fatigue

marine

It refers to the failure of materials exposed to repeated actions of stress fluctuation. It is responsible for a large proportion of cracks occurring in welded ship structural details.

Fatigue (material)

energy

Fatigue is the initiation and propagation of cracks in a material due to cyclic loading.

Fatigue crack, fatigue fracture

marine

A crack that results from the continued application of a cyclic load.

Fatigue endurance

marine

The ability of a metal component or structure to perform without suffering any consequences of fatigue loadings.

Fatigue life

marine

The period during which a structural member may operate without suffering reductions in strength due to the action of repetitive loads.

Fatigue limit

marine

The maximum number of cycles in load application to a structure that can be applied before the appearance of any effects of fatigue (cracks).

Fatigue strength

marine

The strength against crack initiation under dynamic loads during operation.

Fatigue testing

energy

Fatigue testing is a specialised form of mechanical testing that is performed by applying cyclic loading to a coupon or structure.

Fault zone hydrogeology

energy

Fault zone hydrogeology is the study of how brittlely deformed rocks alter fluid flows in different lithological settings, such as clastic, igneous and carbonate rocks.

Feathering

energy

Feathering the blades of a propeller means to increase their angle of pitch by turning the blades to be parallel to the airflow.

Feed check valve

marine

A boiler feed water supply valve which is non-return but can be also regulated.

Feed heater

marine

A heat exchanger which increases the temperature of boiler feed water, usually by using some form of waste, or exhaust steam that is condensed.

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