Discover key measurement terms and definitions.
Alberta Energy Regulator
American Gas Association
American National Standards Institute
American Petroleum Institute
American Society for Testing and Materials
BC Energy Regulator
U.S. Energy Information Administration
Federal Energy Regulatory Commission
Gas Processors Association
Measurement Canada
National Institute of Standards and Technology
Saskatchewan Energy and Resources
Pressure above that of a perfect vacuum; the sum of gauge and atmospheric pressure (designated by psia).
Gas having a significant content of hydrogen sulfide, also referred to as Sour Gas.
The process of determining ownership rights to the gas delivered to a meter.
An inverse ratio of the density of oil to a relative density (i.e., water). It is used to compare densities of hydrocarbon liquids and often as a measure of quality.
The number of BTUs contained in a cubic foot of natural gas adjusted to reflect the actual water content of the gas at delivered pressure, temperature, and gravity conditions.
A contractual agreement between two or more legal entities to account for differences between measured quantities and the total confirmed nominations at a point.
The density of a fluid, reported at legal pressure and temperature base.
The measured bore diameter of an orifice plate divided by the measured internal diameter of the meter tube; this ratio should be in the range of 0.20 to 0.60 for minimum uncertainty in measurement.
A unit of measurement for energy, representing the amount of heat needed to raise the temperature of one pound of water by one degree Fahrenheit.
Factor that can be multiplied against the indicated volume to get the Gross Standard Volume (GSV).
The time designated by a gas sales contract for the beginning of a new “Contract Day” or “Gas Day.”
A factor used to compensate for the inherent inaccuracy associated with calculating volumes from averages of the flowing parameters as opposed to the actual instantaneous values used by the original flow-computing device.
The highest temperature at which two phases (liquid and vapor for most processes) can coexist.
Ten therms or one million British thermal units (Btu).
The extraction of gas plant liquids constituents such as ethane, propane, normal butane, isobutane, and natural gasoline.
Well stream gas that has not had separable liquids removed, such as water, oil, or condensate.
Measurement of the amount that the pressure is greater than atmospheric pressure (designated by psig).
The quantity of liquefiable hydrocarbons contained in one thousand cubic feet of gas.
The temperature at which liquid hydrocarbons condense out of the gas stream.
The taking by an owner of its share of gas or liquids for separate marketing or disposition.
The number of pulses generated by a meter per unit of (nominal) volume.
Provision in gas processing agreements that allows the producer to receive at least an amount equal to proceeds the producer would have been entitled to had he sold the gas at the wellhead without processing.
A request for a physical quantity of gas under a specific purchase, sales, or transportation agreement or for all contracts at a specific point.
The pressure measured when performing a Reid Vapor Pressure test.
A factor used in a volume measurement calculation to correct for deviation from the ideal gas law in differential meters.
This identifies which tap is used to measure line pressure. It may be measured either upstream or downstream.
The location of the taps on either side of the orifice plate across which the differential pressure is measured.
A closed-end reentrant tube designed for insertion of a temperature-sensing element and provided with means for pressure-tight attachment to a vessel.
Flow computers log averages and accumulate flow over a time interval.
A device that converts a signal from a sensor into a form suitable for propagating the measurement information from the site of measurement to the location where the signal is used.
A term that refers to the operational range of a device and is defined as the ratio of maximum capacity to minimum capacity at a stated measurement uncertainty.
Measurement of the amount that the pressure is less than atmospheric pressure.
The Equilibrium Vapor Pressure (EVP) at a given temperature and pressure.
A measure of the interchangeability of gaseous fuels, quantifying the energy output.