WÄRTSILÄ
Encyclopedia of Marine and Energy Technology

S

696 results

Shading coil

energy

A shading coil or shading ring is a single (or a few) turn of electrical conductor (usually copper or aluminum) located in the face of the magnet assembly or armature of an alternating current solenoid.

Shaft

energy

The wind-turbine shaft is connected to the center of the rotor.

Shaft (mechanical engineering)

energy

A shaft is a rotating machine element, usually circular in cross section, which is used to transmit power from one part to another, or from a machine which produces power to a machine which absorbs power.

Shaft alignment

marine

A static condition observed at the bearings supporting the propulsion shafts. It is calculated, conducted and verified when the system is at rest.

Shaft alignment sighting, sighting through

marine

The process of establishing the reference line. The major welding work should be completed on the stern block of the vessel to prevent structural deformation which may result from excessive welding.

Shaft alternator

marine

An alternator driven by the main engine to supply power to the mains. The shaft alternator can be arranged in a number of different ways.

Shaft bearings

marine

Bearings which support the intermediate shafting between the tailshaft and the main engine or gearbox.

Shaft coupling

marine

A connection between two lengths of the propeller shafting. Most shafts are connected to each other by means of forged flanges.

Shaft earthing device

marine

A turning propeller is electrically insulated from the hull by the lubricating oil film in the bearings. Electrical potential is generated between the shaft and the hull.

Shaft tunnel

marine

A watertight enclosure for the propeller shafting large enough to walk in. It extends aft from the engine room to provide access and protection to the shafting in the way of holds.

Shafting

marine

Shafts and associated components used for transmission of power.

Shale Gas

energy

Shale gas is natural gas trapped in fine-grained sedimentary rock, particularly quartz and calcite.

Shale gas

marine

Shale gas is defined as natural gas from shale formations. The shale acts as both the source and the reservoir for the natural gas.

Shallow Water

energy

Water depths less than 30 meters. Considered when offshore wind farms are being planned.

Shark jaws

marine

Remotely controlled chain and wire stoppers used onboard AHTS to unshackle lengths of wire on deck when carrying a loaded wire over the stern roller.

Shear force

energy

In solid mechanics, shearing forces are unaligned forces pushing one part of a body in one specific direction, and another part of the body in the opposite direction.

Shear stress

energy

Shear stress is the component of stress coplanar with a material cross section.

Sheath

marine

A covering fitted over the insulation of an electric cable to protect against heat, oil and chemicals. It must also be tough and flexible.

Shedder plate

marine

A section of inclined plating welded to a bulkhead within a cargo hold, commonly in way of corrugations to facilitate the flow of granular material, at the same time providing additional rigidity to the bulkhead.

Sheer

marine

The longitudinal curve of the vessel decks in a vertical plane, the usual reference being to the ship side; in the case of a deck having camber, its centreline sheer may also be given in off sets.

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