Subpart Y Flares Unit Information
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This topic provides a step-by-step description of how to enter Subpart Y Flares unit information about this facility.

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Composition Setup

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Step 1. Adding or Updating Flares Unit Information
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To delete an existing Flare Unit, click on the delete icon, which is the last column in the FLARES UNIT-LEVEL EMISSIONS SUMMARY table.
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Subpart Y collects the following data about your flare unit:
  • A unique name or identifier, plus optional description for this flare unit (see also About Unique Unit Names)
  • Type of flare: 
    • Steam assisted
    • Air assisted
    • Unassisted
    • Other
  • Flare service type: 
    • General facility flare
    • Unit flare
    • Emergency only flare
    • Back-up flare
    • Other (specify)
  • Method used to calculate the CO2 emissions: 
    • 98.253(b)(1)(ii)(A) – Equation Y-1a Gas Composition Monitored (Equation Y-1a or Y-1b must be used if you have a continuous gas composition monitor on the flare or if you measure it at least weekly)
    • 98.253(b)(1)(ii)(A) – Equation Y-1b Gas Composition Monitored (Equation Y-1a or Y-1b must be used if you have a continuous gas composition monitor on the flare or if you measure it at least weekly)
    • 98.253(b)(1)(ii)(B) – Equation Y-2 Heat Content Monitored (Equation Y-2 must be used if you have a continuous higher heating value monitor or measure it at least weekly and the heating value monitor or measurement is not based on compositional analyses; if compositional analyses are used, you must use Equations 1a or 1b)
    • 98.253(b)(1)(ii) – Equation Y-3 Start-up, Shutdown, Malfunction (Equation Y-3 must be used if you do not measure gas composition or heating value at least weekly.)
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To add or update Subpart Y flare emissions information, locate the FLARES UNIT-LEVEL EMISSION SUMMARY table on the Subpart Y Overview page, and click OPEN.
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 Composition Setup
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Step 2b: Equation Summary and Results
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  • An indication of whether daily or weekly measurement periods are used [98.256(e)(6)]
  • The annual volume of flare gas combusted (in scf) [98.256(e)(6)]
  • The specific consensus-based standard method number or description of the procedure specified by the flow meter manufacturer [98.256(q)]
  • The number of days during the reporting year missing data procedures were used to determine the volume of flare gas combusted
  • The annual average molecular weight (in kg/kg-mole) [98.256(e)(6)]
  • The method used to measure molecular weight [98.256(q)] 
    • Method 18 at 40 CFR part 60, appendix A-6
    • ASTM D1945-03
    • ASTM D1946-90 (Reapproved 2006)
    • GPA 2261-00
    • UOP539-97
    • ASTM D2503-92 (Reapproved 2007)
    • Chromatographic analysis: manufacturer's instructions
    • Other (specify)
  • The number of days during the reporting year missing data procedures were used to determine molecular weight
  • The annual average carbon content of the flare gas (kg carbon/kg flare gas) [98.256(e)(6)]
  • The method used to measure carbon content [98.256(q)] 
    • Method 18 at 40 CFR part 60, appendix A-6
    • ASTM D1945-03
    • ASTM D1946-90 (Reapproved 2006)
    • GPA 2261-00
    • UOP539-97
    • ASTM D2503-92 (Reapproved 2007)
    • Chromatographic analysis: manufacturer's instructions
    • Other (specify)
  • The number of days during the reporting year missing data procedures were used to determine carbon content
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 Composition Setup
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For each flare using the Equation Y-1b calculation method, Subpart Y requires you to enter the following supplemental emissions information:
  • An indication of whether daily or weekly measurement periods are used [98.256(e)(7)]
  • The annual volume of flare gas combusted (in scf) [98.256(e)(7)]
  • The specific consensus-based standard method number or description of the procedure specified by the flow meter manufacturer [98.256(q)]
  • The number of days during the reporting year missing data procedures were used to determine the volume of flare gas combusted
  • The annual average CO2 concentration (in percent by volume or mole) [98.256(e)(7)]
  • The method used to measure CO2 concentration [98.256(q)] 
    • Method 18 at 40 CFR part 60, appendix A-6
    • ASTM D1945-03
    • ASTM D1946-90 (Reapproved 2006)
    • GPA 2261-00
    • UOP539-97
    • ASTM D2503-92 (Reapproved 2007)
    • Chromatographic analysis: manufacturer's instructions
    • Other (specify)
  • The number of days during the reporting year missing data procedures were used to determine CO2 concentration
  • For each carbon containing compound other than CO2 in the flare gas stream identified by the facility, and for each flare using the Equation Y-1b, the system shall require the facility to identify:
  • The annual average concentration of the compound (in percent by volume or mole) [98.256(e)(7)(i)]
  • The method used to measure concentration of the compound [98.256(q)] 
    • Method 18 at 40 CFR part 60, appendix A-6
    • ASTM D1945-03
    • ASTM D1946-90 (Reapproved 2006)
    • GPA 2261-00
    • UOP539-97
    • ASTM D2503-92 (Reapproved 2007)
    • Chromatographic analysis: manufacturer's instructions
    • Other (specify)
  • The number of days during the reporting year missing data procedures were used to determine the concentration of the compound
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 Composition Setup
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To add a non-CO2 carbon-contain compound for the flare, click the "ADD a Compound" link in the CARBON CONTAINING COMPOUNDS (OTHER THAN CO2) IN THE FLARE GAS STREAM section on the Equation Summary and Result page and enter the required information.
When finished entering the required compound information, click SAVE.
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For each flare using the Equation Y-2 calculation method, Subpart Y requires you to enter the following supplemental emissions information:
  • An indication of whether daily or weekly measurement periods are used [98.256(e)(8)]
  • The annual volume of flare gas combusted (in MMscf) [98.256(e)(8)]
  • The specific consensus-based standard method number or description of the procedure specified by the flow meter manufacturer [98.256(q)]
  • The number of days during the reporting year missing data procedures were used to determine the volume of flare gas combusted
  • The annual average higher heating value of the flare gas (MMBtu/MMscf) [98.256(e)(8)]
  • The method used to measure higher heating value of the flare gas [98.256(q)] 
    • ASTM D4809-06
    • ASTM D240-02 (Reapproved 2007)
    • ASTM D1826-94 (Reapproved 2003)
    • ASTM D3588-98 (Reapproved 2003)
    • ASTM D4891-89 (Reapproved 2006)
    • Chromatographic analysis: manufacturer's instructions
    • Other (specify)
  • The number of days during the reporting year missing data procedures were used to determine the higher heating value of the flare gas
  • An indication of whether the annual volume of flare gas combusted was determined using standard conditions of 68 ºF and 14.7 psia or 60 ºF and 14.7 psia [98.256(e)(8)]
  • An indication of whether the annual average higher heating value of the flare gas was determined using standard conditions of 68 ºF and 14.7 psia or 60 ºF and 14.7 psia [98.256(e)(8)]
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 Composition Setup
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For each flare using the Equation Y-3 calculation method, Subpart Y requires you to enter the following supplemental emissions information:
  • The total number of start-up, shutdown, or malfunction (SSM) events exceeding 500,000 scf/day [98.256(e)(9)]
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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. 
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  • 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
When you have finished entering emission results, click SAVE.
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