Rocks & mirror

WÄRTSILÄ
Encyclopedia of Marine and Energy Technology

J

15 results

Jack

marine

A device which can lift weights or exert a large thrust in order to move or position some equipment. It is usually hydraulically operated.

Jacket

marine

1. The passageways which surround the engine cylinders. 2. Steel support framework used to support offshore platform topsides.

Jacket cooling water system

marine

The jacket cooling water system is used for cooling the cylinder liners, cylinder covers and exhaust valves of the main engine.

Jack-up drill rigs, also self-elevating drilling platforms

marine

see MOBILE OFFSHORE DRILLING UNITS.

Jackup rig

energy

A jackup rig or a self-elevating unit is a type of mobile platform that consists of a buoyant hull fitted with a number of movable legs, capable of raising its hull over the surface of the sea.

Jalousie

marine

A shutter or cover with louvers. It provides ventilation while restricting the entry of rain and wind.

Jet fuel

energy

Jet fuel or aviation turbine fuel (ATF, also abbreviated avtur) is a type of aviation fuel designed for use in aircraft powered by gas-turbine engines.

Jettison of cargo

marine

Act of throwing cargo or equipment (jetsam) overboard in order to lighten the vessel or improve its stability in case of emergency.

Jetty, pier

marine

A structure that projects into the water to a reasonable depth of water. It enables ships or boats to come alongside to load or discharge cargo or passengers.

Joiner arrangement

marine

There are construction details showing the combination of all structural fire protection materials.

Joule

energy

The joule is a derived unit of energy in the International System of Units. It is equal to the energy transferred to an object when a force of one newton acts on that object in the direction of the force's motion through a distance of one metre.

Joule heating

energy

Joule heating is the process by which the passage of an electric current through a conductor produces heat.

Joule-Thomson effect

marine

When a fluid is allowed to expand without generating external work and no external heat transfer take place, a temperature change results.

Joule–Thomson effect

energy

The phenomenon where a gas or liquid changes temperature when it experiences a pressure drop.

Jumble winding

energy

Jumble winding or scramble winding is a type of winding of a wire randomly wound on a bobbin.

Download the Encyclopedia