Spaces dedicated for housing refrigerating machinery and the associated equipment.

One or more refrigeration units, together with the piping and ducting system as well as the equipment necessary for cooling and maintaining it at the required temperature.

The machinery comprising the compressor with a driving motor, and a condenser, if fitted, independent of any other refrigeration machinery for provision stores or the air conditioning plant.

Refuse-derived fuel is a fuel produced from various types of waste such as municipal solid waste, industrial waste or commercial waste.

A regenerative heat exchanger, or more commonly a regenerator, is a type of heat exchanger where heat from the hot fluid is intermittently stored in a thermal storage medium before it is transferred to the cold fluid.

A regional transmission organization in the United States is an electric power transmission system operator that coordinates, controls, and monitors a multi-state electric grid.

Start time based on warm standby (preheated or operated in the last 12 hours).

Regulation and licensure in engineering is established by various jurisdictions of the world to encourage public welfare, safety, well-being and other interests of the general public and to define the licensure process through which an engineer becomes authorized to practice engineering and/or provide engineering professional services to the public.

Reid vapor pressure is a common measure of the volatility of gasoline and other petroleum products.

Relative density, or specific gravity, is the ratio of the density of a substance to the density of a given reference material.

The ratio of the mass of a product volume to the mass of the equal volume of fresh water. For a product of limited solubility, the relative density indicates whether it floats on water or sinks, IBC Code).

The amount of water in the air compared to the maximum amount it can absorbe at that temperature.

Relative volatility is a measure comparing the vapor pressures of the components in a liquid mixture of chemicals.

A relay is an electrically operated switch.

The ability of a component, a machine or a system, to perform a particular function under stated conditions for a particular period of time.

Reliability engineering is a sub-discipline of systems engineering that emphasizes the ability of equipment to function without failure.

A relief valve or pressure relief valve (PRV) is a type of safety valve used to control or limit the pressure in a system.

Tethered underwater robot. ROVs are common in deepwater industries. They became essential in the 1980s when the depth of many offshore projects excluded the use of divers.

The Sealion 3000 is a deepwater work class, 100hp ROV capable of operating in depths to 3000 metres. Features include two, seven-function manipulators and vectored thrusters which use a four-bladed propeller to give greater power.

Multi-purpose vessels are often equipped with a removable tweendeck: a set of steel lift away pontoons which can be fitted within the hold at different heights above tank top.