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Updating Summary Information for this Facility

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The Equation Y-20 Summary is presented on the page. You can hover over an element in the equation to reveal a definition of that element.

The basis for QRef the methane emission factor value is required. Select from:

• Company records
• Measurement data
• Process Knowledge/Engineering calculation
• Used default emission factor
• Other (specify)

Step 2b: Process Vent Method for Uncontrolled Blowdown Systems

Subpart Y collects the following data:

The annual CH4 emissions from blowdown systems is required. The e-GGRT system provides links to optional worksheets that may be used to perform the calculations; use of the spreadsheet is entirely optional and is provided for your assistance. To calculate this value using the optional spreadsheet, download the spreadsheet by clicking the link titled "Use Y-19 spreadsheet to calculate". Fill in the spreadsheet using the instructions in the spreadsheet. After completing the spreadsheet, copy the value of CH4 calculated by the spreadsheet to this page in the box next to "Annual CH4 emissions from blowdown systems (metric tons)".

The Equation Y-19 Summary is presented on the page. You can hover over an element in the equation to reveal a definition of that element.

Subpart Y collects the following data:

• Annual volumetric flow discharged to the atmosphere (scf)
• Method used to measure or estimate the annual volumetric flow
• Annual volumetric flow discharged to the atmosphere (scf)
• Method used to measure or estimate the annual volumetric flow rate:
  • Continuous or at least hourly measurements
  • Routine (less frequent than hourly but at least weekly) measurements
  • Periodic (less frequent than weekly) measurements
  • Process knowledge
  • Engineering calculation
  • Other (specify)
• Number of venting events for all relevant vents, if vent is intermittent (see note below)
• Cumulative venting time (hours)
• Annual average mole fraction of CH4 (decimal between 0 and 1)
• Method used to measure or estimate the mole fraction of CH4:
  • Engineering estimates/process knowledge
  • Direct measurement
  • Other (specify)

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After you save the data on this page, the next time you open the page, the calculator on the top of the page will display the CH₄ emissions, rounded to the nearest nearest 0.01 of a metric ton. The value displayed is for informational purposes only.

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After you save the data on this page, the next time you open the page, the calculator on the top of the page will display the CH₄ emissions, rounded to the nearest 0.01 of a metric ton. The value displayed is for informational purposes only.

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After you save the data on this page, the next time you open the page, the calculator on the top of the page will display the CH₄ emissions, rounded to the nearest 0.01 of a metric ton. The value displayed is for informational purposes only.

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Step 2: Indicate emissions calculation methods (if applicable))

If the facility indicates use of "unstabilized crude oil" storage tanks, Subpart Y requires you to report:

• The method used to calculate the reported storage tank emissions
  • Tank-specific methane composition data and direct measurement of gas generation rate
  • Equation Y-23

If the facility indicates use of "stored liquids other than unstabilized crude oil" storage tanks, Subpart Y requires you to report:

• The method used to calculate the reported storage tank emissions
  • AP-42
  • Equation Y-22

When finished, click NEXT

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Step 3: Enter emissions information and additional data

If the facility indicates use of "unstabilized crude oil" storage tanks, Subpart Y also requires you to report:

• The method used to calculate the reported storage tank emissions Tankannual CH4 emissions from unstabilized crude oil storage (from tank-specific methane composition data and direct measurement of gas generation rate or the output of Equation Y-23

When finished, click NEXT

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• , in metric tons)
• The basis for the average mole fraction of CH4 in vent gas
  • Equation Y-23 default
  • Measurement data
  • Product knowledge
  • Other (specify)
• If the facility indicates use of "

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• unstabilized crude oil" storage tanks

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• AND if the facility selected the 'tank-specific methane composition data' method, the system shall require the facility to report:
  • The
  annual CH₄ emissions from stored liquids other than unstabilized crude oil (the output of AP-42 or Equation Y-22, in metric tons)

For assistance in calculating process CH₄ emissions from stored liquids other than unstabilized crude oil using Equation Y-22, access the optional calculation spreadsheet by clicking the link located below the red emissions entry box titled "Use Y-22 spreadsheet to calculate" and follow the provided instructions.

If the facility indicates use of "unstabilized crude oil" storage tanks, Subpart Y also requires you to report:

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• • method used to measure tank-specific methane composition in the vapor
    • Measurement data
    • Product knowledge
    • Other (specify)
    • If measured, the number of hours missing data procedures were used
  • The method used to measure the gas generation rate
    • Procedures specified by flow meter manufacturer
    • Method published by a consensus-based standards organization
  • If measured, number of hours missing data procedures were used to measure the gas generation rate

For assistance in calculating process CH4 emissions from unstabilized crude oil storage using Equation Y-23, access the optional calculation spreadsheet by clicking the link located below the red emissions entry box titled "Use Y-23 spreadsheet to calculate" and follow the provided instructions.

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If the facility indicates use of "stored liquids other than unstabilized crude oil" storage tanks, Subpart Y also requires you to report:

• The annual CH₄ emissions from stored liquids other than unstabilized crude oil (the output of AP-42 or Equation Y-22, in metric tons) AND if the facility selected the 'tank-specific methane composition data' method, the system shall require the facility to report:
• The method used to measure tank-specific methane composition in the vapor
  • Measurement data
  • Product knowledge
  • Other (specify)
• If measured, the number of hours missing data procedures were used
• The method used to measure the gas generation rate
  • Procedures specified by flow meter manufacturer
  • Method published by a consensus-based standards organization
If measured, number of hours missing data procedures were used to measure the gas generation rate

For assistance in calculating process CH₄ emissions from stored liquids other than unstabilized crude oil storage using Equation Y-2322, access the optional calculation spreadsheet by clicking the link located below the red emissions entry box titled "Use Y-23 22 spreadsheet to calculate" and follow the provided instructions.

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After you save the data on this page, the next time you open the page, the calculator on the top of the page will display the CH₄ emissions for stored liquids other than unstabilized crude oil and unstabilized crude oil storage, rounded to the nearest 0.01 of a metric ton. The value displayed is for informational purposes only.

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• The annual CO₂ emissions from sour gas sent off-site (the output of Equation Y-12, in metric tons)
• If measured, specific consensus-based standard method or describe the procedure specified by the flow meter manufacturer used to measure annual volume of sour gas fed (from the facility to the off-site sulfur recovery plant)
• If measured, the number of hours missing data procedures were used for annual volume of sour gas fed (from the facility to the off-site sulfur recovery plant)
• If measured, the method used to measure the annual average mole fraction of carbon in the sour gas:
  • 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)
• If measured, the number of hours missing data procedures were used for annual average mole fraction of carbon in the sour gas

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After you save the data on this page, the next time you open the page, the calculator on the top of the page will display the CO₂ emissions for sour gas sent off-site, rounded to the nearest 0.1 of a metric ton. The value displayed is for informational purposes only.

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After you save the data on this page, the next time you open the page, the calculator on the top of the page will display the cumulative CH₄ emissions from all delayed coking units at the facility, rounded to the nearest 0.01 of a metric ton. The value displayed is for informational purposes only.

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