Midstream

Industry Definitions

Definitions of words and terms used in the gas processing industry.
For questions regarding incorrect/outdated entries or suggestion for adding additional terms, please contact Martin Erne

Term
Definition
underground storage

A geological formation designed or capable so that product can be added and removed at a desired time.

unsaturated compounds

Hydrocarbon compounds having one or more unsaturated carbon valence bonds. These compounds are not found in natural gas streams or gas liquids (NGL) because of their relatively high chemical activity. Unsaturates are produced by a thermal cracking or chemical reaction and can be found in synthetic gas (SG) or light refinery gases (LRG).

vapor

A gas phase of product that was somehow derived from liquids or solids.

vapor pressure

The pressure exerted by a fluid at vapor-liquid equilibrium.

vapor pressure gasoline

A descriptive phrase for natural gasoline meeting a specified vapor pressure.

vapor pressure, GPA

Vapor pressure as specified by GPA procedures.

vapor recovery

Equipment or process for the recovery of the desired components from stock tank vapors or vapors from some other source.

vapor-liquid equilibrium ratio (K-ratio)

Vaporization has ceased to occur in a two-phased fluid, so the ratio of liquds and vapor have become constant over time.

vaporization

The conversion of liquid or solid to vapor.

vaporization loss

The loss of liquid as vapor during processing or storage.

vessel retention time

The amount of time a fluid remains in a vessel.

volatile

The property of being easily evaporated, i.e., changing from liquid to gas.

volatile hydrocarbon

Refer to definition of "volatile."

volatile sulfur
volatility

The property of being volatile.

volumetric average

An average of any property of a mixture or solution in proportion to the volume of the individual components in the mixture or solution.

waste

Any unwanted material that results from the operation of a plant.

waste disposal system

Any system that is provided for the disposal of unwanted waste.

waste heat boiler

A steam generating boiler using as its main heat source by-product heat from an industrial operation or from a high temperature level operation.

weathering

The evaporation of liquid by exposing it to the conditions of atmospheric temperature and pressure. Partial evaporation of liquid by use of heat may also be called weathering.

weathering test

A GPA test for LP-gas for the determination of heavy components in a sample by evaporation of the sample as specified.

weight average

An average of any property of a mixture or solution in proportion to the weight of the individual components in the mixture or solution.

weight in air

Weight compared to a standard with no correction for atmospheric conditions of air buoyancy.

weight in vacuum

Weight compared to a standard in a controlled vacuum cylinder or corrected for air buoyancy.

well stream

The total effluent from a well.