This page provides an overview of the Subpart W acid gas removal units source category reporting requirements.

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.

The acid gas removal units source category is applicable to Onshore Petroleum and Natural Gas Production and Onshore Natural Gas Processing.

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.

Reporting Requirements

• Unit ID or Name is required for Onshore Natural Gas Processing facilities only
• Calculation Methodology Used (98.236(c)(3)(vii)), choose one:
  • Calculation Methodology 1 ((98.233(d)(1))
  • Calculation Methodology 2 ((98.233(d)(2))
  • Calculation Methodology 3 ((98.233(d)(3))
  • Calculation Methodology 4 ((98.233(d)(4))
• Total CO₂ Emissions (98.236(c)(3)(v))
• If Calculation Methodology 1 was used, report Annual average fraction of CO₂ content in the vent from the acid gas removal unit (volumetric fraction) (98.236(c)(3)(ii))
• If Calculation Methodology 2 was used, report Annual average fraction of CO₂ content in the vent from the acid gas removal unit (volumetric fraction) (98.236(c)(3)(ii))
• If Calculation Methodology 3 was used, report:
  • Annual average fraction of CO₂ content of natural gas into the acid gas removal unit (volumetric fraction) (98.236(c)(3)(iii))
  • Annual average fraction of CO₂ content of natural gas out of the acid gas removal unit (volumetric fraction) (98.236(c)(3)(iii))
• Total feed rate entering the acid gas removal unit, using a meter or engineering estimate based on process knowledge or best available data (million actual cubic feet per year) (98.236(c)(3)(i))

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.