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WÄRTSILÄ
Encyclopedia of Marine and Energy Technology

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329 results

Boiling point

energy

The boiling point of a substance is the temperature at which the vapor pressure of a liquid equals the pressure surrounding the liquid and the liquid changes into a vapor.

Boiling point, boiling temperature

marine

A temperature at which a liquid boils at a specific pressure. It is usually given at the atmospheric pressure.

Boiling water reactor

energy

A boiling water reactor is a type of light water nuclear reactor used for the generation of electrical power.

Boiling-point elevation

energy

Boiling-point elevation describes the phenomenon that the boiling point of a liquid (a solvent) will be higher when another compound is added, meaning that a solution has a higher boiling point than a pure solvent.

Boil-off gas (BOG)

marine

LNG tankers are designed to carry natural gas in liquid form at a temperature of – 163°C, close to the vaporization temperature.

Boil-off gas (BOG) combustion system

marine

BOG combustion systems are used only onboard LNG carriers. Excess BOG is sent to the engine room via gas heaters by low capacity compressor and is burned by the main boilers as fuel.

Boil-off gas (BOG) recovery system, BOG reliquefaction plant

marine

An onboard reliquefaction system that recovers boil-off gas in LNG carriers and returns it to the cargo tanks.

Boil-off rate (BOR)

marine

The amount of liquid that is evaporating from a cargo due to heat leakage and expressed in % of total liquid volume per unit time.

Bollard

marine

A rectangular base welded to the deck of the ship, upon which two vertical bitts are welded. Bollards are used to secure the mooring lines.

Bollard pull

marine

The thrust developed at zero ahead speed. Bollard pull is the most commonly used measure of ship-assist tugs performance which have propellers optimized for maximum thrust at close to zero speed.

Bolsters

marine

Flatbeds used to transport damage-free cargoes such as components, pallets, bales, bundles, reels or crates. Heavy-duty forklift trucks and trailers move and stow the bolsters.

Bonded goods

marine

Dutiable goods upon which duties have not been paid i.e. goods in transit or warehoused pending customs clearance.

Bonded store

marine

Place on a vessel where goods are placed behind seal until the time that the vessel leaves the port or country again.

Bonding

energy

Bonding is the practice of intentionally electrically connecting metallic items not designed to carry electricity.

Bonjean curves

marine

Curves of areas and moments of sections versus draught, plotted on the sheer plan.

Boom

marine

1. A long round spar hinged at its lower end, usually to a mast, and supported by a wire rope or tackle from aloft to the upper end of the boom. Cargo, stores, etc, are lifted by tackle leading from the upper end of boom.

Bootleg ground

energy

In building wiring installed with separate neutral and protective ground bonding conductors, a bootleg ground (or a false ground) is a connection between the neutral side of a receptacle or light fixture and the ground lug or enclosure of the wiring device.

Boottop, boottopping

marine

The surface of the outside plating between light and load waterlines. It is the hull area which is most exposed to corrosion.

Borehole

energy

A shaft drilled in the ground between vertical and horizontal angles, usually of small diameter (+/-6")

Borehole thermal energy storage

energy

A method of thermal energy storage whereby one or many hundred boreholes are drilled.

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