Greenhouse Gas Reporting Help

Prior Year - Centrifugal Compressors

Created by Matthew R. Hill on Dec 12, 2016

Please see Reporting Form 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, Liquefied Natural Gas (LNG) Storage, and LNG Import and Export Equipment.

Indicate if the facility has the source type via the radio buttons.

If the source type is present you must report required elements.

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.

Centrifugal Compressor Reporting (Onshore Petroleum and Natural Gas Production)

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 data elements 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)]
Count of compressors (98.236(c)(13)(v)(A))

Centrifugal Compressor Reporting (Onshore Natural Gas Processing, Onshore Natural Gas Transmission Compression, Underground Natural Gas Storage, Liquefied 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 any time 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. The measured and not measured fields should never both be populated for a given compressor and source type.

The exact reporting requirements are described below:

Operating Mode (required if compressor was ever in that operating mode at any time during the year)	Required Data Elements
All Compressors	Compressor ID Were BAMM Used for This Compressor? (Yes or No) Seal Type (wet or dry) Total annual CO₂ emissions from all modes of operation combined in metric tons CO₂ (98.236(c)(13)(iv)) Total annual CH₄ emissions from all modes of operation combined in metric tons CO₂e (98.236(c)(13)(iv)) Total annual N₂O emissions from all modes of operation combined (mt CO_2e) (98.236(c))
Operating Mode with Wet Seals	Annual throughput using an engineering calculation based on best available data (MMscf)(98.236(c)(13)(i)(C)) Number of wet seals connected to the degassing vent (98.236(c)(13)(i)(A)) Type of meter used for making measurements (98.236(c)(13)(i)(D)) Fraction of vent gas recovered for fuel (98.236(c)(13)(i)(B)) Fraction of vent gas recovered for sales (98.236(c)(13)(i)(B)) Fraction of vent gas recovered and flared (98.236(c)(13)(i)(B)) Measured OR Not Measured seal vent CO₂ emissions in metric tons CO₂ (98.236(c)(13)(i)(G)) Measured OR Not Measured seal vent CH₄ emissions in metric tons CO₂e (98.236(c)(13)(i)(G)) Measured OR Not Measured blowdown vent CO₂ emissions in metric tons CO₂ (98.236(c)(13)(ii)(C)) Measured OR Not Measured blowdown vent CH₄ emissions in metric tons CO₂e (98.236(c)(13)(ii)(C))
Operating Mode with Dry Seals	Measured OR Not Measured blowdown vent CO₂ emissions in metric tons CO₂ (98.236(c)(13)(ii)(C)) Measured OR Not Measured blowdown vent CH₄ emissions in metric tons CO₂e (98.236(c)(13)(ii)(C))
Not Operating, Depressurized Mode with Wet or Dry Seals	Measured OR Not Measured isolation valve leakage CO₂ emissions in metric tons CO₂ (98.236(c)(13)(ii)(C)) Measured OR Not Measured isolation valve leakage CH₄ emissions in metric tons CO₂e (98.236(c)(13)(ii)(C))
For Centrifugal Compressors Venting Emissions to FLARES	Did this compressor vent emissions to a flare? (98.236(c)) Total annual CO₂ emissions from flaring for all modes of operation combined (mt CO₂) (98.236(c)) Total annual CH₄ emissions from flaring for all modes of operation combined (mt CO_2e) (98.236(c)) Total annual N₂O emissions from flaring for all modes of operation combined(mt CO_2e) (98.236(c))
For Centrifugal Compressors in OPERATING MODE	Total time in operating mode (hours) (98.236(c)(13)(i )(F)) (98.236(c)(13)(ii)(A)) Reporter emission factor for wet seal oil degassing vents (standard cubic feet per hour) (98.236(c)(13)(i )(E)) Reporter emission factor for blowdown vents (standard cubic feet per hour) (98.236(c)(13)(ii)(B))
For Centrifugal Compressors in SHUTDOWN, DEPRESSURIZED MODE	Total time in shutdown, depressurized mode (hours) (98.236(c)(iii)(A)) Reporter emission factor for isolation valve emissions (standard cubic feet per hour) (98.236(c)(13)(iii)(B))

Total Emissions

The total emissions roll-up at the top of the sheet reflects the sum of the CO₂ equivalents of each gas emission reported for the source type. These summations are reflected and aggregated on the Introduction tab.