A cleaning chamber in an inert gas plant. The purpose of the scrubber is to cool the flue gas and remove most of the sulphur dioxide and particulate soot.

A valve with a disc attached to the spindle. It gets fixed in any position set by moving the spindle.

A sideways thrust which results from the propeller rotation and affects the steering of a ship. It is most noticeable when close to the quay or in a narrow channel.

A valve with a disc not attached to the spindle. The disc must have wings or guide to ensure it seats correctly when the valve is closed.

The opening aft of the stern frame in which the propeller rotates.

A metal plate of heat resisting steel, through which the superheater tubes of a boiler pass.

A piston ring fi tted at the lower end of a piston. It is used to remove excess quantities of lubricating oil from the cylinder walls and return it to the crankcase.

The SCOT (safety chemical oil tanker) initiative is a response to the tonnage replacement demand resulting from the impact of IMO regulations for the phase-out of single-hull tankers on th lower tonnage end of the scale, in the 5000-10 000dwt range.

An alternative cooling system with a large opening in the bottom shell which admits sea water into a large-volume, low pressure circulating system.

A container location device. The SCOLD unit is a compact radio beacon which should be attached to a container with hazardous or noxious cargo.

The elevator with a platform supported by a system of levers and hydraulic rams. Scissor lifts are usually located between the main deck and lower decks, stowing in a recess at the lower level.

see POWER-SAVING DEVICES

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

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.

Removal of exhaust gases by blowing fresh air in.

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

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

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

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

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