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WÄRTSILÄ
Encyclopedia of Marine Technology

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Fabrication

Various processes of producting the structural ship parts.

Fabrication shop

A shipyard facility where plates and profiles are cut and welded together. The assembly systems begin with plates and profiles being moved into a fabrication shop.

Fabrication tolerance

A permissible deviation from a specified value, expressed in actual values or more often as a percentage of the nominal value.

Face plate

Generally, a narrow stiffening along the inner edge of web frames, stringers, etc, to form the flange of the member.

Fail-safe

A system or a machine is fail-safe when, upon the failure of a component or subsystem or its functions, the system or the machine automatically reverts to a designed state of least critical consequence.

Failure mode and effect analysis (FMEA)

A failure analysis methodology used during design to postulate every failure mode and the corresponding effect or consequences. The analysis begins by selecting the lowest level of interest (part, circuit, or module level).

Fairlead

A guide for a mooring line which enables the line to be passed through a ship bulwark or other barrier, or to change direction through a congested area without snagging or fouling.

Fairway

Navigable part of a waterway.

Fairway speed

Mandatory speed in a fairway.

Fall

The rope with blocks making up a tackle. The end secured to the block is called the standing part; the opposite end, the hauling part.

Fall preventer devices (FPD)

Arrangements that provide a physical barrier to inadvertent on load hook release.

Fallpipe rockdumping vessel

A very specialized ship consisting of a hold in which graded rock is stocked. The rock material is placed at an exact location on pipelines or the sea bottom through a fallpipe.

Falls

Wires or ropes used to hoist or lower a boat or cargo.

Fan

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.

Fathom

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

Fatigue

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 crack, fatigue fracture

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

Fatigue endurance

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

Fatigue life

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

Fatigue limit

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

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