Various processes of producting the structural ship parts.
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.
A permissible deviation from a specified value, expressed in actual values or more often as a percentage of the nominal value.
Generally, a narrow stiffening along the inner edge of web frames, stringers, etc, to form the flange of the member.
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.
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).
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.
Navigable part of a waterway.
Mandatory speed in a fairway.
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.
Arrangements that provide a physical barrier to inadvertent on load hook release.
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.
Wires or ropes used to hoist or lower a boat or cargo.
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.
A measure of length, equal to 6 linear feet, used for depths of water and lengths of anchor chain.
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.
A crack that results from the continued application of a cyclic load.
The ability of a metal component or structure to perform without suffering any consequences of fatigue loadings.
The period during which a structural member may operate without suffering reductions in strength due to the action of repetitive loads.
The maximum number of cycles in load application to a structure that can be applied before the appearance of any effects of fatigue (cracks).