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

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 type is applicable to Onshore petroleum and natural gas production (98.236(a)(2)), Onshore natural gas processing (98.236(a)(3)), and Onshore petroleum and natural gas gathering and boosting (98.236(a)(9)) facilities.                           

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, then indicate whether missing data procedures were used.

Reporting Requirements

Table D.1 Acid gas removal unit specific information must be completed by if the facility has any acid gas removal units subject to reporting under 98.232. Required data elements include:

• Unit identification or name (98.236(d)(1)(i))
• Sub-basin ID (required for Onshore petroleum and natural gas production facilities only) (98.236(d)(1)(vi)) - the pick list for this data element is populated based on the (aa)(1) Onshore Production tab of the Smart Form. Be sure a valid Sub-basin ID is used.
• County and state (required for Onshore petroleum and natural gas gathering and boosting facilities only) (98.236(d)(1)(vi))
• Total feed rate entering the acid gas removal unit for the year (million cubic feet) (98.236(d)(1)(ii))
• Calculation methodology used (98.236(d)(1)(iii))
• Are any CO₂ emissions from the acid gas removal unit recovered and transferred outside the facility? (98.236(d)(1)(iv)
• Total CO₂ emissions (mt CO₂) (98.236(d)(1)(v))

Table D.1 Acid gas removal unit specific information

Acid gas removal unit reporting is on a unit basis, not a vent basis. If your AGR unit has multiple vents, enter the unit ID, not the vent IDs in Table D.1 and aggregate data from multiple vents as needed in Tables D.2 through D.6.

 

Table D.2 Calculation Method 1 emissions is required for units with emissions determined using Calculation Method 1. Required data elements include:

• Unit identification or name (98.236(d)(1)(i)). This data element is auto-populated from Table D.1 in the Smart Form.
• Annual average fraction of CO₂ content in the vent from the acid gas removal unit (volumetric fraction) (98.236(d)(2)(i)(A))
• Annual volume of gas vented from the acid gas removal unit (standard cubic feet) (98.236(d)(2)(i)(B))
  
  

Table D.2 Calculation Method 1 emissions

 

Table D.3 Calculation Method 2 emissions is required for units with emissions determined using Calculation Method 2. Required data elements include:

• Unit identification or name (98.236(d)(1)(i)). This data element is auto-populated from Table D.1 in the Smart Form.
• Annual average fraction of CO₂ content in the vent from the acid gas removal unit (volumetric fraction) (98.236(d)(2)(i)(A))
• Annual volume of gas vented from the acid gas removal unit (actual or standard cubic feet) (98.236(d)(2)(i)(B))
• Whether the annual vented gas volume is reported on an actual or standard basis, and the temperature and pressure values used to calculate the reported gas volume (98.236)

 

Table D.3 Calculation Method 2 emissions

 

Table D.4 Calculation Method 3 emissions is required for units with emissions determined using Calculation Method 3.

• Unit identification or name (98.236(d)(1)(i)). This data element is auto-populated from Table D.1 in the Smart Form.
• Equation used (W-4A or W-4B) (98.236(d)(2)(ii)(A))
• Annual average fraction of CO₂ content of natural gas into the acid gas removal unit (volumetric fraction) (98.236(d)(2)(ii)(C))
• Annual average fraction of CO₂ content of natural gas out of the acid gas removal unit (volumetric fraction) (98.236(d)(2)(ii)(B))
• Natural gas flow rate into the acid gas removal unit (needed when using Equation W-4A) (annual volume in actual or standard cubic feet) (98.236(d)(2)(ii)(D))
• Natural gas flow rate out of the acid gas removal unit (needed when using Equation W-4B) (annual volume in actual or standard cubic feet) (98.236(d)(2)(ii)(D))
• Whether the natural gas flow rate is reported on an actual or standard basis, and the temperature and pressure values used to calculate the reported gas flow rate (98.236)

Table D.4 Calculation Method 3 emissions

 

Table D.5 Calculation Method 4 emissions is required for emissions determined using Calculation Method 4.

• Unit identification or name (98.236(d)(1)(i)). This data element is auto-populated from Table D.1 in the Smart Form.
• Name of the simulation software package used (98.236(d)(2)(iii)(A))
• Natural gas feed temperature (^oF) (98.236(d)(2)(iii)(B))
• Natural gas feed pressure (psi)  (98.236(d)(2)(iii)(C))
• Natural gas flow rate (standard cubic feet per minute) (98.236(d)(2)(iii)(D))
• Acid gas content of feed natural gas (mole percent) (98.236(d)(2)(iii)(E))
• Acid gas content of outlet natural gas (mole percent)  (98.236(d)(2)(iii)(F))
• Unit operating hours (98.236(d)(2)(iii)(G)) 
• Exit temperature of the natural gas (^oF) (98.236(d)(2)(iii)(H))
• Solvent pressure (98.236 (psi) (d)(2)(iii)(I))
• Solvent temperature (^oF)  (98.236(d)(2)(iii)(J))
• Solvent circulation rate (gallons per minute) (98.236(d)(2)(iii)(K))
• Solvent weight (pounds per gallon) (98.236(d)(2)(iii)(L))
  
  

Table D.5 Calculation Method 4 emissions

Enlarged view of Table D.5 Calculation Method 4 emissions

Enlarged view of Table D.5 Calculation Method 4 emissions (continued)

Table D.6 Missing data procedures used for Acid Gas Removal emission calculations is required for the identification of missing data procedures used for acid gas removal unit emission calculations. These data elements include:

• Unit ID or Name

• Parameters (specify only one per row)

  • Calculation Method 1 emissions (Table D.2)
  • Calculation Method 2 emissions (Table D.3)
  • Calculation Method 3 emissions (Table D.4)
• Measurement Frequency

• Number of quarters missing data procedures were used [98.236(bb)(1)] (required only if the measurement frequency was quarterly)

• Total number of hours in the year missing data procedure was used [98.3(c)(8)], [98.236(bb)(2)] (required unless the measurement frequency was quarterly, annually, biannually,  or N/A)

• Procedures used for missing data [98.235(h)]

 

Table D.6 Missing data procedures used for Acid Gas Removal emission calculations

Enlarged view of Table D.6 Missing data procedures used for Acid Gas Removal emission calculations

Enlarged view of Table D.6 Missing data procedures used for Acid Gas Removal emission calculations (continued)

Total Emissions

The total emissions roll-up at the top of the sheet reflects the sum of each gas emission reported for the source type. These summations are calculated automatically by the Smart Form and tabulated on the Introduction tab.