Please see Reporting Form Instructions instructions on downloading the blank reporting form and uploading the completed reporting form.
You may also refer to Optional Calculation Spreadsheet Instructions to download the Subpart W calculation spreadsheet.
This page provides an overview of the Subpart W centrifugal compressor source category e-GGRT reporting requirements.
The centrifugal compressor source category is applicable to Onshore Petroleum Natural Gas Production, Onshore Natural Gas Processing, Onshore Natural Gas Transmission Compression, Underground Natural Gas Storage, Liquified Natural Gas (LNG) Storage, and LNG Import and Export Equipment.
- If the source type is present you must report required emissions.
If the facility has the source type, the Best Available Monitoring Methods and Missing Data table must be completed.
- For further information, see Best Available Monitoring Methods and Missing Data Reporting.
The reporting requirements for Onshore Petroleum and Natural Gas Production differ from the rest of the industry segments for this subpart. For Onshore Petroleum and Natural Gas Production, only the following two emission values are required to be reported:
- The total annual CO2 emissions from all compressors combined, in metric tons CO2 [98.236(c)(13)(v)(B)]
- The total annual CH4 emissions from all compressors combined, in metric tons CO2e [98.236(c)(13)(v)(B)]
Centrifugal Compressor Reporting (Onshore Natural Gas Processing, Onshore Natural Gas Transmission Compression, Underground Natural Gas Storage, Liquified Natural Gas (LNG) Storage, and LNG Import and Export Equipment)
All applicable industry segments other than Onshore Petroleum and Natural Gas Production must report emissions individually for each centrifugal compressor.
For each compressor, emissions will be reported by mode of operation and by specific source type. Two modes of operation that require emission monitoring are the operating mode, and the not operating, depressurized mode. Compressors that were in operating mode and have wet seal vents must report emissions from the wet seal vents. Compressors that were in operating mode with wet or dry seal vents must report emissions from blowdown vents. Compressors with wet or dry seal vents that were in the not operating, depressurized mode must report emissions from unit isolation valve leakage. Emissions from each mode of operation must be reported if the compressor was ever in that mode at anytime during the year.
For each emission source, there are separate reporting fields for if the emission source was measured during the year (Equation W-22) or if the emission source was not measured and a default emission factor was applied (Equations W-23 and W-24). If one or more sources for a compressor were measured during the year, the emissions should be filled in for the respective measured fields. For any sources that emissions were not directly measured, the not measured field should be reported in place of the measured fields. If BAMM was used and no emission sources were measured, the compressor specific BAMM field should be reported as “yes”, and only the not measured emission fields should be reported. If BAMM was not used in place of direct measurement of at least one mode, then “no” should be entered for the BAMM field. In no occurrence should the measured and not measured fields both be populated for a given compressor and source type.
The exact reporting requirements are described below:
The total emissions roll-up reflects the sum of the CO2 equivalents of each required gas emission for the source type. These summations are reflected and aggregated on the Introduction tab.