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.

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

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.

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

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.

Mandatory speed in a fairway.

Navigable part of a waterway.

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.

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).

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

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

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.

Various processes of producting the structural ship parts.

An officer who is qualified by training and examination to operate and maintain machinery.

Various tests undertaken on main propulsion and auxiliary machinery during sea trials.

Special attention should be paid to the engine room ventilation in order to ensure trouble free operation of all equipment.

An easily accessible room outside the machinery space with means of closing engine room ventilation, boiler blowers, fuel transfer pumps and fuel valves, as well as means of releasing of fire extinguishing system.

To obtain good working conditions in the engine room, it is necessary to investigate its layout from a very beginning of any design.

An engine margin, normally 10-15% of its maximum continuous rating (MCR), is recommended in order to lower fuel and maintenance costs and to have reserve power for increased speed.

The compartment on board a ship that includes the main propulsion machinery as well as the control room, the auxiliary machinery and other equipment.