WÄRTSILÄ
Encyclopedia of Marine and Energy Technology

S

696 results

Sanitary pump

marine

A pump which supplies seawater for flushing toilets.

Saturable absorption

energy

Saturable absorption is a property of materials where the absorption of light decreases with increasing light intensity.

Saturated steam

energy

Saturated steam is steam that is in equilibrium with heated water at the same pressure, i.e., it has not been heated above the boiling point for its pressure.

Saturation

marine

The condition of air at any given temperature and water vapour pressure, when a reduction in temperature would cause condensation.

Saturation pressure

energy

Saturation pressure is the pressure for a corresponding saturation temperature at which a liquid boils into its vapor phase.

Saturation temperature

energy

The saturation temperature is the temperature for a corresponding saturation pressure at which a liquid boils into its vapor phase.

Savonius wind turbine

energy

A type of vertical axis wind turbine that creates torque on a rotating shaft. Invented by the Finnish engineer Sigurd Johannes Savonius

SCADA

energy

Supervisory control and data acquisition (SCADA) is a control system architecture comprising computers, networked data communications and graphical user interfaces (GUI) for high-level process supervisory management, while also comprising other peripheral devices like programmable logic controllers (PLC) and discrete proportional-integral-derivative (PID) controllers to interface with process plant or machinery.

Scale

marine

A numerical factor which relates the measured value to the actual value.

Scallop

marine

A hole cut into a stiffening member to allow continuous welding of a plate seam.

Scantlings

marine

A marine term for the size and strength of structural elements: the dimensions of the ship frames, girders, stiffeners and plates.

Scattering

energy

Scattering is a term used in physics to describe a wide range of physical processes where moving particles or radiation of some form, such as light or sound, is forced to deviate from a straight trajectory by localized non-uniformities (including particles and radiation) in the medium through which they pass.

Scattering parameters

energy

Scattering parameters or S-parameters describe the electrical behavior of linear electrical networks when undergoing various steady state stimuli by electrical signals.

Scavenge Air System

marine

The integrated part of the main engine supplied with scavenge air from one or more turbochargers.

Scavenge fire

marine

The fire of flammable mixture (cylinder oil, unburned fuel and carbon) which can collect in the scavenge space of an engine.

Scavenging

marine

Removal of exhaust gases by blowing fresh air in.

Scavenging methods

marine

Cross-flow scavenging, loop scavenging, uniflow scavenging. The uniflow one is the most efficient scavenging system but requires an exhaust valve in the cylinder head.

Scene

marine

The area where the event, e.g. an accident has happened.

Scepticism

energy

Scepticism is generally a questioning attitude or doubt towards one or more putative instances of knowledge which are asserted to be mere belief or dogma.

Schneekluth duct

marine

see POWER-SAVING DEVICES

Download the Encyclopedia