WHAT WE DO

Glossary of Terms

Rated Flow : The maximum flow that the power supply system is capable of maintaining at a specific operating pressure.

Refining : A series of processes for converting crude oil and its fractions to finished petroleum products. Following distillation, a petroleum fraction may undergo one or more additional steps to purify or modify it. These refining steps include; thermal cracking, catalytic cracking, polymerization, alkylation, reforming, hydrocracking, hydroforming, hydrogenation, hydrogen treating, hydrofining, solvent extraction, dewaxing, deoiling, acid treating, clay filtration, and deasphalting. Refined lubricating oils may be blended with other lube stocks, and additives may be incorporated, to impart special properties.

Refraction: the change of direction or speed of light as it passes from one medium to another.

Refrigerator oil: The lubricant added to the working fluid in an expansion-type cooling unit which serves to lubricate the pump mechanism.

Rerefining: a process of reclaiming used lubricant oils and restoring them to a condition similar to that of virgin stocks by filtration, clay adsorption or more elaborate methods.

Reservoir: a container for storage of liquid in a fluid power system.

Reservoir (sump) filter: a filter installed in a reservoir in series with a suction or return line.

Residual dirt capacity: the dirt capacity remaining in a service loaded filter element after use, but before cleaning, measured under the same conditions as the dirt capacity of a new filter element.

Ring lubrication: a system of lubrication in which the lubricant is supplied to the bearing by an oil ring.

Ring sticking: freezing of a piston ring in its groove in a piston engine or reciprocating compressor due to heavy deposits in the piston ring zone.

Rings: circular metallic elements that ride in the grooves of a piston and provide compression sealing during combustion. Also used to spread oil for lubrication.

Roller bearing: an antifriction bearing comprising rolling elements in the form of rollers.

Rolling oil : An oil used in hot- or cold-rolling of ferrous and non-ferrous metals to Facilitate feed of the metal between the work rolls, improve the plastic deformation of the metal, conduct heat from the metal, and extend the life of the work rolls. Because of the pressures involved, a rolling oil may be compounded or contain EP additives. In hot rolling, the oil may also be emulsifieable.

Roll-off cleanliness: the fluid system contamination level at the time of release from an assembly or overhaul line. Fluid system life can be shortened significantly by full-load operation under a high fluid contamination condition for just a few hours. Contaminant implanted and generated during the break-in period can devastate critical components unless removed under controlled operating and high performance filtering conditions.

Rotary seal: A mechanical seal which rotates with a shaft and is used with a stationary mating ring.

Rust inhibitor: A type of corrosion inhibitor used in lubricants to protect surfaces against rusting.

Rust prevention test (turbine oils): a test for determining the ability of an oil to aid in preventing the rusting of ferrous parts in the presence of water.