The standard "DVGW G 260 Gas quality", developed by the German Technical and Scientific Association for Gas and Water (DVGW), specifies the requirements for the quality of fuel gases used in the gas supply of the general public and defines parameters for the development, standardization and testing of gas delivery, gas transportation, gas distribution, gas storage, operation of gas plants/systems and gas appliances for commercial and industrial gas applications. Gases transported in separate pipelines that are not used in the supply of the general public or are used as energy carriers or sources or used in special gas appliances are not subject to the scope of this standard.
Natural gas is composed of several component gases and is therefore subject to natural variation. This inconsistency affects the energy contained in a given volume of gas. Gas quality is often described based on measurements such as heating value, also known as calorific value, Wobbe index, relative density, etc.
Gas quality is most commonly measured using a gas chromatograph. A gas chromatograph is used to separate the components of natural gas so that each major component can be quantified. The internal process consists of subsystems that inject the sample, separate the sample, detect the components, and report the results.
Natural gases from different sources have different compositions and therefore different properties. Natural gas is not a formulated product and due to shared pipelines with a single delivery point, the compositions of the gas can vary greatly. When supplies differ significantly, the distributor has the option of blending to meet specifications (e.g. Wobbe index requirements).
Calorific value can be summarized as a measure of the amount of energy released when a known volume of gas is completely burned under specified conditions. It is a measure of the heating power of the gas in kilowatt-hours. The calorific value range is usually specified in natural gas regulations.
Most devices control the flow of gas to the burner by maintaining a constant gas pressure at an orifice. The Wobbe index is a measure of the heat delivered to a burner, calculated as the ratio of the calorific value to the square root of the relative density. Gases with different compositions but similar Wobbe index values will produce similar heat output.
A gas with a high Wobbe index produces a large flame with the potential to produce toxic carbon monoxide. A gas with a low Wobbe index produces a higher flame speed and flame lift potential.
In this standard, gas quality requirements are presented under the following headings:
This standard was developed by both the Technical Committees “Gas Combustible Substances” and “Renewable Gases”. This standard serves as the basis for the gas quality of fuel gas used in the gas supply to the general public. Gases from renewable sources are of particular interest due to their climate protection implications. The requirements for the quality of gases used in the gas supply to the general public have been updated several times.
Among the numerous testing, measurement, analysis and evaluation studies carried out for businesses in various sectors, our organization also provides testing services defined in the "DVGW G 260 Gas quality" standard with its trained and expert staff and advanced technological equipment.
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