Subpart Y Flares Unit Information
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To calculate annual CO2 emissions, download the associated calculation spreadsheet by clicking the link titled "Use Y-x spreadsheet to calculate" (where 'x' represents 1a, 1b, 2, or 3 depending on the CO2 calculation method used for this flare). Fill in the spreadsheet using the instructions in the spreadsheet. After completing the spreadsheet, copy the value of CO2 calculated by the spreadsheet to this page in the red box next to "Annual CO2 emission from this flare (metric tons)."upload the file using by clicking the browse button, selecting the file from the appropriate directory, and clicking the blue UPLOAD button.

To calculate annual CH4 and N2O emissions, download the associated calculation spreadsheets by clicking the links titled "Use Y-4 spreadsheet to calculate" and "Use Y-5 spreadsheet to calculate," respectively. Fill in the spreadsheets using the instructions in each spreadsheet. After completing the spreadsheets, copy the values of CH4 and N2O calculated by the spreadsheets to this page in the red box next to "Annual CH4 emission from this flare (metric tons)" and "Annual N2O emission from this flare (metric tons)," respectivelyupload the files using by clicking the browse button, selecting the file from the appropriate directory, and clicking the blue UPLOAD button.

If using a mass flow meter to measure flow, molecular weights may be estimated instead of measured.

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For each flare using the ARB 95113(d) - Start-up, Shutdown, Malfunction Equation calculation method, use the SSM equation Calculation Spreadsheet to calculate the result. Upload the completed XML exported from the spreadsheet by clicking the browse button, selecting the XML file from the appropriate directory, and clicking the blue UPLOAD button.

Subpart Y requires you to enter the following supplemental emissions information:

  • Wiki Markup
    The total number of start-up, shutdown, or malfunction (SSM) events exceeding 500,000 scf/day \[98.256(e)(9)\]
  • Basis for the fraction of carbon in the flare gas contributed by methane

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Step 2d: Save Your Data

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This web site is maintained by a contractor to the California Air Resources Board (RY2015.R.03)