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 other emissions from equipment leaks estimated using emission factors source category reporting requirements.

The other emissions from equipment leaks estimated using emission factors source category is applicable to Onshore Petroleum and Natural Gas Production, Onshore Natural Gas Processing, Onshore Natural Gas Transmission Compression, Underground Natural Gas Storage, Liquefied Natural Gas (LNG) Storage, LNG Import and Export Equipment, and Natural Gas Distribution.

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

For each component type that uses emission factors for estimating emissions for equipment leaks found in each leak survey, the facility must report:

• Component Type (98.236(c)(15))
  • Compressor Components, Gas Service - Valve
  • Compressor Components, Gas Service - Connector
  • Compressor Components, Gas Service - Open-Ended Line
  • Compressor Components, Gas Service - Pressure Relief Valve
  • Compressor Components, Gas Service - Meter
  • Non-compressor Components, Gas Service - Valve
  • Non-compressor Components, Gas Service - Connector
  • Non-compressor Components, Gas Service - Open-Ended Line
  • Non-compressor Components, Gas Service - Pressure Relief Valve
  • Non-compressor Components, Gas Service - Meter
  • Storage Station, Gas Service - Valve
  • Storage Station, Gas Service - Connector
  • Storage Station, Gas Service - Open-Ended Line
  • Storage Station, Gas Service - Pressure Relief Valve
  • Storage Station, Gas Service - Meter
  • LNG Storage, LNG Service - Valve
  • LNG Storage, LNG Service - Pump Seal
  • LNG Storage, LNG Service - Connector
  • LNG Storage, LNG Service - Other
  • LNG Storage, LNG Terminal - Valve
  • LNG Storage, LNG Terminal - Pump Seal
  • LNG Storage, LNG Terminal - Connector
  • LNG Storage, LNG Terminal – Other
  • LDC, T-D Stations - Connector
  • LDC, T-D Stations - Block Valve
  • LDC, T-D Stations - Control Valve
  • LDC, T-D Stations - Pressure Relief Valve
  • LDC, T-D Stations - Orifice Meter
  • LDC, T-D Stations - Regulator
  • LDC, T-D Stations - Open-ended Line
• Date of first complete survey (98.236(c)(15)(i)(A))
• Total count of leaks in the first survey (98.236(c)(15)(i)(A))
• Dates of further complete surveys (98.236(c)(15)(i)(A))
• Total count of leaks in further surveys (98.236(c)(15)(i)(A))
• For Onshore Natural Gas Processing facilities only
  • Minimum concentration of CO₂ (98.236(c)(15)(i)(B)) - this is a volumetric concentration expressed as a fraction.
  • Maximum concentration of CO₂ (98.236(c)(15)(i)(B)) - this is a volumetric concentration expressed as a fraction.
  • Minimum concentration of CH₄ (98.236(c)(15)(i)(B)) - this is a volumetric concentration expressed as a fraction.
  • Maximum concentration of CH₄ (98.236(c)(15)(i)(B)) - this is a volumetric concentration expressed as a fraction.
  • If only one concentration observation is available it is acceptable to use that concentration as both the minimum and maximum.
• Annual CO₂ emissions (98.236(c)(15)(i)(C))
• Annual CH₄ emissions (98.236(c)(15)(i)(C))

For each component type that uses emission factors for estimating emissions for equipment leaks calculated using population counts and factors, the facility must report (This table does not apply to Natural Gas Distribution facilities):

• Component Type (98.236(c)(15))
  • Storage wellheads, Gas Service - Connector
  • Storage wellheads, Gas Service - Valve
  • Storage wellheads, Gas Service - Pressure Relief Valve
  • Storage wellheads, Gas Service - Open Ended Line
  • LNG Compressor - Vapor Recovery Compressor
  • Onshore, gas service - valve
  • Onshore, gas service - connector
  • Onshore, gas service - open-ended line
  • Onshore, gas service - pressure relief valve
  • Onshore, light crude service - valve
  • Onshore, light crude service - flange
  • Onshore, light crude service - connector
  • Onshore, light crude service - open-ended line
  • Onshore, light crude service - other
  • Onshore, heavy crude service - valve
  • Onshore, heavy crude service - flange
  • Onshore, heavy crude service - connector
  • Onshore, heavy crude service - open-ended line
  • Onshore, heavy crude service - other
• Annual CO₂ Emissions (98.236(c)(15)(ii)(C))
• Annual CH₄ Emissions (98.236(c)(15)(ii)(C))
• Total count for each type of leak source (98.236(c)(15)(ii)(A))

Onshore Production facilities that use Component Count Methodology 1 complete the following table:

• Major Equipment Type (98.236(c)(15)(ii)(B))
  • Wellheads
  • Separators
  • Meters/piping
  • Compressors
  • In-line heaters
  • Dehydrators
  • Heat-treater
  • Header
• Total count for each type of Major Equipment (98.236(c)(15)(ii)(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.