This page provides an overview of the other emissions from equipment leaks estimated using emission factors 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 other emissions from equipment leaks estimated using emission factors source type is applicable to following industry segments: 

• Onshore petroleum and natural gas production [98.230(a)(2)]
• Onshore natural gas processing [98.230(a)(3)]
• Onshore natural gas transmission compression [98.230(a)(4)]
• Underground natural gas storage [98.230(a)(5)]
• Liquefied Natural Gas (LNG) storage [98.230(a)(6)]
• LNG import and export equipment [98.230(a)(7)]
• Natural gas distribution [98.230(a)(8)]
• Onshore petroleum and natural gas gathering and boosting [98.230(a)(9)]
  
  

Indicate the method used to calculate emissions for this source type via the picklist selection. 

If you have questions about how you should respond to the applicability questions, follow this link for additional help content.

 

If the facility has the source type, then indicate whether missing data procedures were used.

        

Reporting Requirements

Table Q.1 Leak Survey Characterization must be completed for each facility that completed a leak survey. Required data elements include:

• Number of complete equipment leak surveys performed during the calendar year (98.236(q)(1)(i))
• For Natural gas distribution facilities conducting multi-year surveys, number of years in the leak survey cycle (98.236(q)(1)(ii))
• Method Use to Conduct Leak Surveys (98.236(q)(1)(v)) Select “Yes” from the picklist for all that apply: 
  • Optical gas imaging instrument as specified in §60.18 (98.234(a)(1))
  • Method 21 (98.234(a)(2))
  • Infrared laser beam illuminated instrument (98.234(a)(3))
  • Acoustic leak detection devices (98.234(a)(5))
  • Optical gas imaging instrument as specified in §60.5397a (98.234(a)(6))
  • Method 21 as specified in §60.5397a (98.234(a)(7))
  
  
  

Table Q.1 Leak Survey Characterization

Table Q.2 Emissions calculated for component types using emissions factors must be completed for each facility for each component type that uses emission factors for estimating emissions for equipment leaks found in each leak survey.  Report the count of components surveyed of all component types and the emissions from those component types (as calculated by Equation W-30) for your industry segment. Note that certain component types are only required if they are subject to the well site or compressor station fugitive emissions standards in 40 CFR 60.5397a or if the facility elected to comply with 98.236(q) as indicated in the applicability questions.  If no leaks were identified from any components of a component type during the leak survey, enter "0" (zero) in columns G through I for that component type. Required data elements include: 

• Component type (98.236(q)(2)(i)) - this data element is autofilled in the Smart Form
• Total number of surveyed component type identified as leaking (98.236(q)(2)(ii))
• Average time the surveyed components are assumed to be leaking and operational (98.236(q)(2)(iii))

• CO₂ emissions (surveyed components identified as leaking only) (mt CO₂) (98.236(q)(2)(iv))

• CH4 emissions (surveyed components identified as leaking only) (mt CH₄) (98.236(q)(2)(v))

Table Q.2 Emissions calculated for component types using emissions factors

Table Q.3 Natural gas distribution facility activity and emissions must be completed by Natural gas distribution facilities with emission sources listed in 98.232(i)(1). Report the leak survey data from above grade T-D transfer stations and meter/regulator runs for the calendar year and for the current leak survey cycle. NOTE:  If you do not have any metering-regulating stations or transmission-distribution (T-D) transfer stations, enter "0" (zero) into these fields; do not leave the fields blank. 

Required data elements include:

• For leaks surveyed in the calendar year:

  • Total number of above grade T-D transfer stations (98.236(q)(3)(i))

  • Number of meter/regulator runs at above grade T-D transfer stations surveyed in the calendar year (98.236(q)(3)(ii))
  • Average time meter/regulator runs surveyed in calendar year were operational (98.236(q)(3)(iii))
• For leaks surveyed in the current leak survey cycle:
  • Number of above grade T-D transfer stations surveyed in current leak survey cycle (98.236(q)(3)(iv))
  • Number of meter/regulator runs at above grade T-D transfer stations surveyed in current leak survey cycle (98.236(q)(3)(v))
  • Average time that meter/regulator runs surveyed in the current leak survey cycle were operational (98.236(q)(3)(vi))
  • Meter/regulator run CO₂ emission factor based on all surveyed T-D transfer stations in current leak cycle, Average of current survey (standard cubic feet per operational hour of all meter/regulator runs) (98.236(q)(3)(vii))
  • Meter/regulator run CH₄ emission factor based on all surveyed T-D transfer stations in current leak cycle, Average of current survey (standard cubic feet per operational hour of all meter/regulator runs) (98.236(q)(3)(viii))
• Does the facility perform equipment leak surveys across a multiple year leak survey cycle? If 'yes' (98.236(q)(3)(ix)):
  • Total number of meter/regulator runs at above grade T-D station facilities (98.236(q)(3)(ix)(A))
  • Average estimated time that each meter/regulator run at above grade T-D transfer stations was operational in the calendar year (hours) (98.236(q)(3)(ix)(B))
  • Annual CO₂ emissions from all above grade T-D transfer stations combined (mt CO₂) (98.236(q)(3)(ix)(C))
  • Annual CH₄ emissions from all above grade T-D transfer stations combined (mt CH₄) (98.236(q)(3)(ix)(D))

Table Q.3 Natural gas distribution facility activity and emissions

 

Table R.1 Equipment leaks calculated using population counts and factors must be completed only by Onshore petroleum and natural gas production and Onshore petroleum and natural gas gathering and boosting facilities. NOTE: Do not complete this table for any emission source types/components that are subject to the well site or compressor station fugitive emissions standards in 40 CFR 60.5397a or emission source types/components for which the facility elected to comply with 98.236(q) according to 98.233(q)(1)(iv). Required data elements include:

• Emission source types (98.232(c)(21) and (r))
  Geographic location (98.236(r)(1)(i))
• Total number of emission source type (for gathering pipelines, this value is the number of miles of pipeline per material type) (98.236(r)(1)(ii))
• Average estimated time that the emission source type was operational in the calendar year (hours) (98.236(r)(1)(iii))
• CO₂ emissions (mt CO₂) (98.236(r)(1)(iv))
• CH₄ emissions (mt CH₄) (98.236(r)(1)(v))

Table R.1 Equipment leaks calculated using population counts and factors (for Onshore Petroleum and Natural Gas Production and Onshore Petroleum and Natural Gas Gathering and Boosting only)

Table R.2 Emissions calculated for component types by population count must be completed for each component type that population counts for estimating emissions for equipment leaks using Equation W-32A. This table is relevant to the following industry segments: Underground natural gas storage [98.230(a)(5)], Liquefied Natural Gas (LNG) storage [98.230(a)(6)], LNG import and export equipment [98.230(a)(7)], and Natural gas distribution [98.230(a)(8)]. NOTE: Do not complete this table for any emission source types/components that are subject to the well site or compressor station fugitive emissions standards in 40 CFR 60.5397a or emission source types/components for which the facility elected to comply with 98.236(q) according to 98.233(q)(1)(iv).The required data elements include:

 

• Emission source type (98.232, 98.233(r)(1)) - this data element is pre-filled in the Smart Form for each applicable industry segment
• Total number of emission source types (98.236(r)(1)(ii))
• Average estimated time that the emission source type was operational in the calendar year (hours) (98.236(r)(1)(iii))
• CO₂ emissions (mt CO₂) (98.236(r)(1)(iv))
• CH₄ emissions (mt CH₄) (98.236(r)(1)(v))

Table R.2 Emissions calculated for component types by population count

Table R.3 Equipment leaks calculated using population counts and factors must be completed for Natural gas distribution facilities, as applicable. The required data elements include:

• Number of above grade T-D transfer stations at the facility (98.236(r)(2)(i)) 
• Number of above grade metering-regulating stations that are not T-D transfer stations (98.236(r)(2)(ii)) 
• Total number of meter/regulator runs at above grade metering-regulating stations that are not above grade T-D transfer stations (98.236(r)(2)(iii)) 
• Average estimated time that each meter/regulator run at above grade metering-regulating stations that are not above grade T-D transfer stations was operational in the calendar year (98.236(r)(2)(iv)) 
• Annual CO₂ emissions from above grade metering-regulating stations that are not above grade T-D transfer stations (mt CO₂) (98.236(r)(2)(v)(A)) 
• Annual CH₄ emissions from above grade metering-regulating stations that are not above grade T-D transfer stations (mt CH₄) (98.236(r)(2)(v)(B)) 

If your facility has above grade metering-regulating stations that are not above grade T-D transfer stations AND your facility also has above grade T-D transfer stations, you must report the following emissions

 

Table R.4 Major Equipment Type must be completed by facilities in the Onshore petroleum and natural gas production and Onshore petroleum and natural gas gathering and boosting industry segments. NOTE: Do not complete this table for any emission source types/components that are subject to the well site or compressor station fugitive emissions standards in 40 CFR 60.5397a or emission source types/components for which the facility elected to comply with 98.236(q) according to 98.233(q)(1)(iv).  Required data elements include:

• Component count calculation method for all emission source types in Table R.1 other than gathering pipelines (98.236(r)(3)(i))
• Major equipment type (98.236(r)(3)(ii)) (this data element is pre-filled by the Smart Form for the appropriate options for Natural gas production and Gathering and boosting equipment (Table W-1B) and Crude oil production equipment (Table W-1C)
• Equipment type present at the facility (98.236(r)(3)(ii)(A))
• Count of major equipment type in Eastern and/or Western US (98.236(r)(3)(ii)(B))

Table R.4 Major Equipment Type (for Onshore Petroleum and Natural Gas Production and Onshore Petroleum and Natural Gas Gathering and Boosting only)

Table QR.1 Missing Data Table is required if your facility relied on missing data procedures to develop data elements used in calculating emissions from equipment leaks.  Complete only the applicable sections (note that the ID columns are tailored to the different Tables):

• Emission source type/Major equipment type, service type, component type, geographic location (as appropriate for the target Table and Parameter)
• Parameters 
• 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 QR.1 Missing Data Table

 

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.