Technical TermsRSS

Technical Terms


Alfa - A = signal letter and flag. Morse = ( . - )Burgee flag= White at hoist, blue at the fly.When hoisted singly from a ship it means "Undergoing speed trial" (Kerchove).

1. A type of lifting gear often installed on stern of cable vessels, pipe-lying vessels and offshore construction vessels for sub sea load handling. 2. A fabricated steel structural element of a slow speed, two-stroke diesel engine. It stands on the bedp ...

A winch designed specifically for lowering、retaining and hoisting an accommodation ladder, and having a rope storage drum.

– A boiler test to ensure that the safety valves can release steam fast enough to prevent the pressure rising by 10%. The main steam stop valve is closed during the test.

– Offshore cranes and other equipment doing subsea work are provided with AHC systems to ensure presicion in high sea states and extreme weather conditions. The essential function of AHC technology is the ability to land and retrieve subsea installations ...

– The reduction of rolling provides better fuel/speed performance on rough seas, enhances crew safety and possibly their efficiency. The roll amplitude can be reduced by passive devices, such as bilge keels, or by active devices, such as hydrofoilshaped ...

– The mass of water which is considered to be set in motion by a ship when heaving, pitching, rolling and vibrating.

– Chemicals added to fuel, lubricating oils or fresh water to improve their physical or chemical characteristics

– Bonding strength; the attraction of a coating to the substrate, or to another film of paint or any other material such as steel.

– Substance that makes things stick.

– The confirmed or official ship dimensions.

Admiralty constant – A coefficient used in the preliminary estimations of the power required in a new design to attain the desired speed. It is presented by the formula: where: D = displacement in tons, V = speed in knots, P = shaft power in kW. Values ...

(AP) – The aft perpendicular passes through the aft end of the freeboard length L.

A power-driven cable lifter mounted on a vertical shaft. The shaft may be extended beyond the cable lifter to carry a warping end. The cable lifter is declutch-able from the prime mover, and in operation and use is similar to the windlass.

A winch with the ability to drop and hoist the anchor which is tied with a rope or a rope combined with chain and to hold and storage rope may be fixed or not the warping ends

A mooring winch with the additional ability to haul or render a mooring rope within selectable limits without direct human intervention.


Bravo - B = signal letter and flag. Morse = ( - . . . ) Burgee flag= Red. When hoisted singly from a ship it means " I am discharging / loading explosives or flammable substances". Still widely used when bunkering.

A bill of materials (also known as a BOM or bill of material) is a comprehensive list of parts, items, assemblies and other materials required to create a product, ...

The foremost port, used for stowing.


A V-shaped chain, wire, or rope attached to a vessel being towed to which the towline is connected.