Rocks & mirror
WÄRTSILÄ
Encyclopedia of Marine and Energy Technology

S

696 results

Steering gear power unit

marine

An electric motor and its associated electrical equipment in the case of electric steering gear, or an electric motor and its associated electrical equipment and connected pump in the case of electrohydraulic steering gear...

Steering nozzle

marine

A nozzle pivoting on a vertical axis and fitted around a screw propeller. Steering nozzles create steering forces by means of a deflected jet.

Steering system

marine

A system used for of steering the ship. It is in constant use when the ship is underway, and any failure or malfunction may result in disaster.

Stem

marine

The bow frame forming the apex of the intersection of the forward sides of a ship. At its lower end it is rigidly connected to the keel.

Step-up/Step-down transformers

energy

Transformers that either increase (step-up) or reduce (step-down) the input voltage to produce the desired output voltage. This is achieved by varying the primary and secondary windings.

Stern

marine

The after end of ship.

Stern bearings, tailshaft bearings, lub propeller shaft bearings

marine

Bearings which support the propeller shaft.

Stern discharge system (SDS)

marine

The system installed on FSOs and FPSOs for off-loading of crude oil to shuttle tankers.

Stern frame

marine

A heavy strong member (large casting, forging or weldment) attached to after end of the keel.

Stern lines

marine

Mooring lines leading ashore from the after end or poop of a ship, often at an angle of about 45 degrees to the fore and the aft line.

Stern ramp/door

marine

Access equipment for ro-ro ships. The system consists of a watertight axial ramp/door with entering and bridging flaps.

Sterntube

marine

The watertight tube enclosing and supporting the propeller shaft. It consists of a cast-iron or casted steel cylinder fitted with bearing surface within which the propeller shaft, enclosed in a sleeve, rotates.

Sterntube after seal, spacer ring

marine

A split ring mounted on the sterntube. Removal of this ring enables the housing to be moved with respect to the bush, with the result that the lip seals move to an unworn contact surface.

Sterntube bearings

marine

Oil-lubricated white metal bearing usually consists of two bushes pressed into a stern-tube.

Sterntube lubricating oil systems

marine

In principle, the sterntube aft seals can function without a lubrication system. However, the aft sealing functions better and has a longer life if it is fitted, like the forward sealing, with a lubrication system.

Sterntube seals, propeller shaft seals

marine

A housing with series of seal rings clamped into position on the bush. Sterntube seals have to perform two separate functions...

Stevedore

marine

A person or firm employed to load and unload vessels.

Stiffener

marine

A secondary supporting structural member: an angle, T-bar, channel, built-up section, etc. used to stiffen plating of a bulkhead, a deck, etc.

Stiffness

marine

The resistance of the structure to deflect under load within elastic limit of the material.

Stirling engine

energy

A heat engine comprising two cylinders, the hot cylinder whereby gases expand and a cold cylinder to cool and regenerate the gas in a closed loop system.

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