WÄRTSILÄ
Encyclopedia of Marine and Energy Technology

S

696 results

Sheer strake

marine

The top strake of a ship side shell plating.

Sheerleg

marine

A type of the floating crane.

Shell and tube heat exchanger

energy

Shell and tube heat exchangers consist of a series of tubes which contain fluid that must be either heated or cooled.

Shell door

marine

Doors in the side shell can be seen on almost every type of ship and are used for various duties. The most common ones are for passengers, pilot entry, and for bunker hoses

Shell expansion

marine

A plan showing the seams and butts, thickness and associated welding of all plates comprising the shell plating, framing, etc.

Shell plating

marine

The plates forming the outer side and bottom skin of the hull. The shell plating is of crucial importance to the longitudinal strength of the ship structure.

Shelter deck

marine

A continous deck above the freeboard deck.

SHERLOG

marine

The MacGREGOR Sherlog is a type-approved, ultrasonic testing system for verification of tightness of hatch covers, doors, ramps and windows.

Shielded cable

energy

A shielded cable or screened cable is an electrical cable of one or more insulated conductors enclosed by a common conductive layer.

Shielded metal arc welding (SMAW)

marine

An arc welding process with an arc between a covered electrode and the weld pool.

Shielding gas

marine

Protective gas used to prevent or reduce atmospheric contamination.

Shifting boards

marine

Wooden planks which are used to partition holds to prevent the movement of loose bulk cargoes. They are fitted fore and aft on the centreline in the way of hatches.

Shifting cargoes, shifting loads, sliding loads

marine

Granular cargoes that adversely affect the stability. During roll, the granular material, such as grain, coal, etc., stays in place until the heel angle exceeds the angle of repose.

Shim

marine

A thin strip of metal which is used to adjust the clearance between mating parts, e.g. the two halves of a big end bearing.

Ship

marine

A sea-going or coastal vessel which is not propelled by oars.

Ship design process

marine

The development of a new ship design is carried out in three steps.

Ship elevator

marine

A ship lifting system. The ship elevator includes a number of hydraulic lift/lower chain jack stations on each side of the elevator platform.

Ship identification number, IMO number

marine

Passenger ships of 100 gt and above and cargo ships of 300 gt and above are to have an identification number (IMO number) which is to be shown on the statutory certificates.

Ship model basins

marine

Hydrodynamic test centres equipped with model testing tanks and propulsor testing facilities to perform experiments on hull and propulsor design.

Ship motions

marine

A ship at sea moves in six degrees of motion: heave, sway, surge, roll, pitch and yaw. The first three are linear motions.

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