Emission factors are often used to estimate methane leak emissions for natural gas transmission and storage facilities, such as compressor leak EFs and station leak EFs. However, different approaches are used in the literature for grouping compressor and other facility leak data, which can cause confusion when comparing estimates from different reports or data sources. It is also important to understand these differences when selecting EFs to use for purposes such as facility or system methane inventory development for a particular company or within a particular state. This...
Emission factors are often used to estimate methane leak emissions for natural gas transmission and storage facilities, such as compressor leak EFs and station leak EFs. However, different approaches are used in the literature for grouping compressor and other facility leak data, which can cause confusion when comparing estimates from different reports or data sources. It is also important to understand these differences when selecting EFs to use for purposes such as facility or system methane inventory development for a particular company or within a particular state. This white paper discusses the different the approaches used for T&S leak EFs based on Subpart W data reporting, and the historical and current EPA Annual GHG Inventory Report and tabulates the EFs to assist in understanding source-specific differences, and also to understand how EFs should be used to ensure all leak sources are included within an estimate, while not double-counting compressor station and storage facility leak emissions.