A pump operating by the reduction or increase in volume of a space by mechanical action which physically moves the liquid or gas.

A craft that is supported by the buoyancy of the water it displaces.

Water added to the separator bowl to displace the oil and to ensure there is no loss of oil at sludge discharge.

Means by which a device presents visual information to the navigator, including conventional instrumentation.

Any gas present in water. It may be released when boiled.

Any impurities existing in pure water either produced by an evaporator or used as boiler feed water.

1. Product of condensation of freshwater vapour. 2. Any product obtained by distilling petroleum and condensing the vapours.

A fuel oil that is derived from the distillation operations.

Distillation, or classical distillation, is the process of separating the components or substances from a liquid mixture by using selective boiling and condensation.

The effects of welding on a metal plate. It may appear as shrinkage or an angular twisting. Distortion of steel structures caused by welding and other thermal processes can be assigned to three main causes.

A term used when a ship requires immediate assistance.

A radio signal from a distressed automatically directed to a RCC giving position, identification, course and speed of the vessel as well as the nature of distress.

An urgent signal for help assistance.

Distributed generation, also distributed energy, on-site generation, or district/decentralized energy, is electrical generation and storage performed by a variety of small, grid-connected or distribution system-connected devices referred to as distributed energy resources.

A load that acts over a part or the whole of the surface of the structure.

A system made up of smaller, individual pumping stations (one flow center for each heat pump) each controlled individually by the operation of the specific heat pump unit that they serve.

Wind turbines installed on the "customer" side of the electric meter, or are installed at or near the place where the energy they produce will be used.

Electricity supply to various items of equipment, often at different voltages.

A distribution board (also known as panelboard, breaker panel, or electric panel) is a component of an electricity supply system that divides an electrical power feed into subsidiary circuits while providing a protective fuse or circuit breaker for each circuit in a common enclosure.

A distribution substation transfers power from the transmission system to the distribution system of an area.