Centrifugal Compressors Deferred
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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 deferred 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.

Refer to Centrifugal Compressors Instructions page for information regarding non-deferred data elements.

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 Facilities in the Onshore Petroleum and Natural Gas Production industry segment are required to report:

  • Count of compressors (98.236(c)(13)(v)(A))

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 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.

The exact reporting requirements are described below:

NOTE: EFs for a particular mode-source combination should be the same for ever compressor that was in the particular mode at some time during the year (leave blank if the compressor was not in that same mode during the year). 

  • 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)(13)(iii)(A))
    • Reporter emission factor for isolation value emissions (standard cubic feet per hour) (98.236(c)(13)(iii)(B))

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