The oil and gas industry is usually divided into three major sectors: upstream, midstream, and downstream.

A measure of time that a machine or system is not operational due to breakdown or maintenance requirements

On the opposite side from the direction from which the wind blows.

Turbines where the blades are downwind of the tower.

Draft surveys are used to determine the weight of bulk cargo such as iron ore, coal, steel scrap, grain and some specific quantities of liquid cargo loaded onto, or discharged from, a vessel.

Resistance (force) caused by friction in the direction opposite to the motion of the centre of gravity of a moving body in a fluid.

A dimensionless quantity that is used to quantify the drag or resistance of an object in a fluid environment, such as air or water.

The drag force acting on a particular body moving relative to a fluid within which it is immersed.

Uncontrolled moving of an anchor over the sea bottom because it no longer prevents the movement of the vessel.

A pipe used for drainage.

A hole or opening used for the removal of water from an enclosed volume or surface to avoid flooding of the volume and/or corrosion of the metal surface.

A non-return valve used for drainage purposes.

A planned community being built where part of the infrastructure will contain a central solar heating system with seasonal thermal energy storage capability.

The number markers on each side of a ship at the bow, stern, and amidships, to indicate the distance from the lower edge of the number to the bottom of the keel or other fixed reference point.

The vertical distance from the moulded base line amidships to the actual waterline. - Air draught -The maximum distance from the water level to the highest point of the ship at the prevailing draught.

Drawing is a metalworking process which uses tensile forces to stretch metal, glass, or plastic.

A drawworks is the primary hoisting machinery component of a rotary drilling rig.

Dredging is a displacement of soil, carried out under water. It serves several different purposes. One of the applications meets the need to maintain minimum depths in canals and harbours by removing mud, sludge, gravel and rocks.

According to Significant Ships of 1997 The dredging equipment features double articulated 700mm diameter trailing suction pipes port and starboard. Each is fitted with a draghead having six nozzles fed from a 260mm diameter jet water pipe.

Moving of an anchor over the sea bottom to control the movement of the vessel.