The mandatory wash of the cargo tanks prior to loading cargo.

MacGREGOR’s patented ‘hold overpressure system’ is a way of maximising the weathertightness of hatch covers.

A valve which keeps the tank over pressure or under pressure within approved, limits. P/V valve provides for the flow of the small volumes of vapour, air or inert gas mixtures caused by thermal variations in a cargo tank.

The technology of inert gas production by the removal of oxygen from air used on LNG tankers.

A sudden increase in the pressure of the liquid in a pipeline brought about by an abrupt change in flow velocity. The pressure surge may cause a rupture of the piping and an extensive oil spill.

Increasing the density of the air charge usually accomplished on diesel engines by the use of exhaust gas turborcharging.

Pressure chambers are installed on board diving support vessels. Divers are accommodated inside, observed, medically checked and supplied.

The installation of both outfit and machinery items in large structural assembly units prior to these units being erected in the ship.

Preheat is used primarily to slow the cooling rate of a welded component in order to reduce the shrinkage stresses, prevent hardening and loss in ductility. It may be applied by propane gas torch.

The use of automatic switches to trip or disconnect non-essential loads from the switchboard in the event of overload.

Schneekluth wake equalizing duct - The propulsion improving device, especially for full block ships, developed by Professor Schneekluth.

Substances derived from petroleum or coal, caustics, acids, or products of polymerization.

Chemical tankers are cargo ships constructed or adapted and used for the carriage of any liquid chemicals in bulk.

According to Significant Ships of 2003 The BOW SUN, delivered by New Szczecin Shipyard in 2003, is one of the largest chemical tanker in the world.

All components and systems necessary to supply the DP system with power.

Installations for the generating, conversion, storage and distribution of electrical energy.

Paints contain two components: the base and the hardener. Curing is obtained by mixing the base and hardener in defined proportions.

A plate used as floor, marked with raised diamond checkers or squares to provide good footing.

The hydraulic equipment for supplying power to turn the rudderstock, comprising a steering gear power unit or units, together with the associated pipes and fittings, and a rudder actuator.

A valve which permits the flow of liquid in only one direction, i.e. a non-return valve.