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For questions regarding incorrect/outdated entries or suggestion for adding additional terms, please contact Martin Erne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
plus fraction

A grouping of non discrete hydrocarbon components in chemical composition.

pressure swing adsorption (PSA)

An adsorption-desorption cycle that is driven by changes in pressure which effects sorbent capacity.

processing agreement

A contract for taking raw natural gas fluids and converting them into merchantable products.

propane

A paraffinic compound having the chemical formula C3H8 .

propane, HD-5

A specific grade of propane meeting the GPA Publications 2140 HD-5 propane specifications..

propane, commercial

A liquefied hydrocarbon product consisting predominately of propane and/or propylene and is ready for commercial use.

propylene

A olefinic compound having the chemical formula C3H6.

pure component cascade (PCC)

A multiple-stage refrigeration cycles used for LNG production to liquify natural gas utilizing 3 types of refrigerants: propane, ethylene and methane.

raw gas

Unprocessed natural gas.

raw mix liquids

Unfractionated product from a gas processing facility.

real gas

A vapor phase mixture that deviates from the ideal gas law due to intermolecular forces

reboiler

A device used to add energy to the bottom of the distillation column.

receiver

A vessel in which a process stream or product, especially a condensed overhead, is temporarily stored.

reclaimer

A device which captures undesirable high boiling point contaminants of a stream and separates them from the desired lighter materials.

recovery

That percent or fraction of a given component in the plant feed which is recovered as plant product.

recycle

The return of a stream or a part of a stream to a previous processing location for additional recovery of the desired components and/or for operational control.

reflux

In fractionation or distillation, the portion of condensed overhead product returned to the column to enhance achievable purity of the overhead product.

reflux ratio

The term applied to the distillation process to give a relative measurement to the volume of reflux to overhead product.

refrigeration process

A process that uses compression, liquifecation, and evaporation for cooling needs.

regulator

A valve which controls the flow or pressure of liquid or gas through a line.

relative density

The mass of a specific volume of fluid divided by the mass of a specific volume of reference fluid, per the specified conditions.

relief system

The equipment used for temporarily releasing fluid to avoid a pressure in excess of the design pressure for a vessel or piping arrangement.

reserves

Estimated quantities of gas and liquid hydrocarbon reservoir fluids which geological and engineering data demonstrate with reasonable certainty to be recoverable.

residue

The material which remains after a separation process.

retrograde condensation

A phase behavior phenomenon where liquids condense from a gas as pressure is reduced.