Glossary

To support the industry and stakeholders in the use of consistent terminology, Ipieca, IOGP, GIE and MARCOGAZ prepared this methane emissions glossary covering the whole natural gas value chain.

Intended for policymakers and regulators working on methane regulation in Europe, this glossary will be updated to reflect new legislation and technologies.

Download the Methane Emissions Glossary

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There are currently 2 names in this directory beginning with the letter E.
E
Emission Factor (EF)
The emission factor describes typical methane emissions per unit of activity of a component or part of the gas system (e.g. valve, pipeline section) or from an event and can have units like [kg/km], [kg/event] or [kg/equipment]. [12]
(Note - this is not an exhaustive list, the emission factor is linked to the activity factor and expressed in a numerical value consistent with the activity factor)
Emissions survey
The action of using emission identification instrument that can identify the presence or absence of emission sources to examine all potential sources of emissions. (Note - a survey is typically part of a complete survey program and part of LDAR strategy)

References

[1] Directive 2009/73/EC of the European Parliament and of the Council of 13 July 2009

[2] EN-12186 – Gas infrastructure – Gas pressure regulating stations for transmission and distribution – Functional requirements

[3] EN-12327 – Gas infrastructure – Pressure testing, commissioning and decommissioning procedures – Functional requirements

[4] EN-12583 – Gas Infrastructure – Compressor stations – Functional requirements

[5] EN-15446 – Fugitive and diffuse emissions of common concern to industry sectors – Measurement of fugitive emission of vapours generating equipment and piping leaks

[6] GIE & MARCOGAZ Report “Potential ways the gas industry can contribute to the reduction of methane emissions” https://www.gie.eu/index.php/gie-publications/methane-emissions/methaneemission-report-2019/27786-gie-marcogaz-report-for-the-madrid-forum-potentialway-gas-industry-can-contribute-to-the-reduction-of-methane-emissions/file

[7] IPIECA/API/IOGP (2020). Oil and gas industry guidance on voluntary sustainability reporting https://www.ipieca.org/media/5105/ipieca_sustainability-guide_2020_glossary.pdf

[8] IPIECA Methane Glossary http://www.ipieca.org/resources/awareness-briefing/methane-glossary/

[9] ISO 14532 – Natural gas — Vocabulary

[10] JCGM-100 – Evaluation of measurement data – Guide to the expression of uncertainty in measurement. s.l.: Committee for Guides in Metrology (JCGM/WG 1), 2008

[11] MARCOGAZ – Assessment of methane emissions for gas Transmission and Distribution system operators, 2019 https://www.marcogaz.org/app/download/8161672063/WG_ME-485- Assessment+of+methane+emissions+for+gas+Transmission+and+Distribution+system+ operator.pdf?t=1602849054

[12] MARCOGAZ – Guidance for using the MARCOGAZ methane emissions reporting template – DSO, TSO, LNG receiving terminals and UGS https://www.marcogaz.org/app/download/8271109963/WG_ME710.pdf?t=1606988780

[13] MGP Reducing methane emissions: Equipment leaks https://methaneguidingprinciples.org/best-practice-guides/equipment-leaks/

[14] MGP Reducing methane emissions: Identification, detection, measurement and quantification https://methaneguidingprinciples.org/wp-content/uploads/2020/09/ReducingMethane-Emissions_Identification-Detection-Measurement-andQuantification_Guide.pdf

[15] MGP Reducing methane emissions: Transmission, storage, LNG terminals and distribution https://methaneguidingprinciples.org/wp-content/uploads/2020/09/ReducingMethane-Emissions-transmission-storage-LNG-terminals-and-distribution-Guide.pdf

[16] Oil and Gas Methane Partnership Technical Guidance Documents https://ccacoalition.org/en/content/oil-and-gas-methane-partnership-technicalguidance-documents

[17] Regulation (EC) No 715/2009 of the European Parliament and of the Council of 13 July 2009

[18] US EPA – ‘Method 21: Determination of volatile organic compound leaks’