Midstream

Midstream Glossary

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For questions regarding incorrect/outdated entries or suggestion for adding additional terms, please contact Martin Erne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
Common Use Examples
dry gas
A vapor containing only components that will not condense under expected operating conditions.

dual mixed refrigerant process (DMR process)
A process employed in the liquefication of natural gas where two or more refrigerants are mixed and used in conjunction with multiple stages of compression to produce liquified natural gas (LNG) as efficiently as possible.

ebullition cooling

(Jessica-move to strike this term. It seems to be an outdated term based on a very complicated process of engine cooling that seems to have worked itself out with higher cooling system pressures. However I will take the shot and the group can decide after that) Ebullition; the act of bubbling or boiling. Ebullition Cooling; One type of design for the cooling system of internal combustion engines as found in gas compressors.

elute
The act of a component leaving a chromatographic column.

emulsion

The dispersion of fine particles of an immiscible liquid and/or solids with another liquid in which the particles are suspended.

emulsion
The dispersion of fine particles of an immiscible liquid and/or solids with another liquid in which the particles are suspended.

end point

The maximum temperature observed on the thermometer during an ASTM distillation test.

end point
The maximum temperature observed on the thermometer during an ASTM distillation test.

enhanced oil recovery (EOR)
A recovery technique that alters the chemical composition of the oil that makes it easier to extract.

enthalpy

The heat content per unit mass of a material. In English units, this is expressed as Btu per pound above some base temperature. A thermodynamic property equalling the sum of a system's internal energy and the product of its pressure and volume.

enthalpy
A thermodynamic property equaling the sum of a system's internal energy and the product of its pressure and volume.

entrained gas

Gas in the vapor phase trapped within a liquid because of the pressure and temperature surrounding the fluids.

entrained gas
Gas in the vapor phase trapped within a liquid because of the pressure and temperature surrounding the fluids.

entrained liquid

Mist-sized liquid droplets carriedsuspended inby a vapor flow. Not to be confused with components in the vapor phase itself.

entrained liquid
Mist-sized liquid droplets suspended in a vapor.

entropy

The measure of a system's thermal energy per unit temperature that is not available for useful work.

entropy
The measure of a system's thermal energy per unit temperature that is not available for useful work.

ethane

A paraffinic compound having the formula C2H6.

ethane
A paraffinic compound having the formula C2H6.

ethane recovery

An operating mode or contractual term used in a gas processing plant where the majority of ethane is directed into the liquid stream.

ethane recovery
An operating mode or contractual term used in a gas processing plant where the majority of ethane is directed into the liquid stream.

ethane rejection

An operating mode or contractual term used in a gas processing plant where the majority of ethane is directed into the gas stream.

ethane rejection
An operating mode or contractual term used in a gas processing plant where the majority of ethane is directed into the gas stream.

ethyl mercaptan
A colorless, flammable, volatile liquid compound of disagreeable odor.

ethylene

An olefinic compound having the formula C2H4.