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To delete an existing Catalytic Cracking, Fluid Coking, or Catalytic Reforming Unit, click on the delete icon, which is the last column in the CATALYTIC CRACKING UNITS, TRADITIONAL FLUID COKING UNITS, FLUID COKING UNITS WITH FLEXICOKING DESIGN, AND CATALYTIC REFORMING UNITS EMISSIONS SUMMARY table.

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Subpart Y Subpart Y collects the following data about your Catalytic Cracking, Fluid Coking, or Catalytic Reforming unit:

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When you are finished entering the required information, click NEXT.

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For Catalytic Cracking or Coking For Catalytic Cracking or Coking units that are NOT monitored by CEMS, Subpart Y also collects the following data:

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When you are finished entering the required information, click SAVE.

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For Catalytic Cracking or For Catalytic Cracking or Coking units that are monitored by CEMS, Subpart Y also collects the following data:

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• Annual average flow rate of exhaust gas (dscfh)
• Manufacturer's recommended method used for annual average flow rate of exhaust gas
• Number of hours missing data procedures were used for annual average flow rate of exhaust gas (hours)
• Annual average percent CO₂ in exhaust gas stream (percent by volume - dry basis; 0 ? x ? 0 ≤ x ≤ 100)
• Manufacturer's recommended method used for annual average percent CO₂ in exhaust gas stream
• Number of hours missing data procedures were used for annual average percent CO₂ in exhaust gas stream (hours)
• Annual average percent CO in exhaust gas stream (percent by volume - dry basis; 0 ? x ? 0 ≤ x ≤ 100)
• Manufacturer's recommended method used for annual average percent CO in exhaust gas stream
• Number of hours missing data procedures were used for annual average percent CO in exhaust gas stream (hours)

The Equation Y-6 Summary and monitored flow requirements are presented in the screenshot below. You can hover over an element in the equation to reveal a definition of that element.

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CO₂ Emissions Calculation: 98.253(c)(2) – Equation Y-6 and Y-7a

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• Annual CO₂ emission from this unit (metric tons)
• Annual average percent CO₂ in exhaust gas stream (percent by volume - dry basis; 0 ? x ? 0 ≤ x ≤ 100)
• Describe the manufacturer's recommended method that was used for annual average percent CO₂ in exhaust gas stream
• Number of hours missing data procedures were used for annual average percent CO₂ in exhaust gas stream (hours)
• Annual average percent CO in exhaust gas stream (percent by volume - dry basis; 0 ? x ? 0 ≤ x ≤ 100)
• Describe the manufacturer's recommended method that was used for annual average percent CO in exhaust gas stream
• Number of hours missing data procedures were used for annual average percent CO in exhaust gas stream (hours)
• Annual average volumetric flow rate of exhaust gas from this unit prior to the combustion of other fossil fuels (dscfh)
• Annual average flow rate of inlet air (dscfh)
• Annual average flow rate of oxygen enriched air (a value of "0" may be entered if inlet air is not oxygen enriched to avoid validation errors) (dscfh)
• Annual average percent O₂ in exhaust gas stream (percent by volume - dry basis; 0 ? x ? 0 ≤ x ≤ 100)
• Describe the manufacturer's recommended method that was used for annual average percent O₂ in exhaust gas stream
• Number of hours missing data procedures were used for annual average percent O₂ in exhaust gas stream (hours)
• Annual average percent O₂ in oxygen-enriched gas stream inlet (a value of "0" may be entered if inlet air is not oxygen enriched to avoid validation errors) (percent by volume - dry basis; 0 ? x ? 0 ≤ x ≤ 100)

The Equation Y-6 and Y-7a Summaries are presented in the screenshot below. You can hover over an element in the equation to reveal a definition of that element.

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CO₂ Emissions CalculationCO₂ Emissions Calculation: 98.253(c)(2) – Equation Y-6 and Y-7b

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• Annual CO₂ emission from this unit (metric tons)
• Annual average percent CO₂ in exhaust gas stream (percent by volume - dry basis; 0 ? x ? 0 ≤ x ≤ 100)
• Describe the manufacturer's recommended method that was used for annual average percent CO₂ in exhaust gas stream
• Number of hours missing data procedures were used for annual average percent CO₂ in exhaust gas stream (hours)
• Annual average percent CO in exhaust gas stream (percent by volume - dry basis; 0 ? x ? 0 ≤ x ≤ 100)
• Describe the manufacturer's recommended method that was used for annual average percent CO in exhaust gas stream
• Number of hours missing data procedures were used for annual average percent CO in exhaust gas stream (hours)
• Annual average volumetric flow rate of exhaust gas from this unit prior to the combustion of other fossil fuels (dscfh)
• Annual average flow rate of inlet air (dscfh)
• Annual average flow rate of oxygen enriched air (a value of "0" may be entered if inlet air is not oxygen enriched to avoid validation errors) (dscfh)
• Annual average percent N₂ in exhaust gas stream (percent by volume - dry basis; 0 ? x ? 0 ≤ x ≤ 100)
• Describe the method that was used to measure annual average percent N₂ in exhaust gas stream:
  • Method 18 at 50 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
  • Maximum N₂ impurity specification
  • Other (specify)
• Number of hours missing data procedures were used for annual average percent N₂ in exhaust gas stream (hours)
• Annual average percent N₂ in oxygen-enriched gas stream inlet (a value of "0" may be entered if inlet air is not oxygen enriched to avoid validation errors) (percent by volume - dry basis; 0 ? x ? 0 ≤ x ≤ 100)
• Describe the method that was used to measure annual average percent N₂ in oxygen-enriched gas stream inlet:
  • Method 18 at 50 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
  • Maximum N₂ impurity specification
  • Other (specify)
• Number of hours missing data procedures were used for annual average percent N₂ in oxygen-enriched gas stream inlet (a value of "0" may be entered if inlet air is not oxygen enriched to avoid validation errors) (hours)

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The Equation Y-6 and Y-7b Summaries are presented in the screenshot below. You can hover over an element in the equation to reveal a definition of that element.

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CO₂ Emissions Calculation: 98.253(c)(3) – Equation Y-8

The annual CO₂ emissions from the unit operations is required . To calculate this value download the spreadsheet by clicking the link titled “Use and must be calculated using the Equation Y-8 spreadsheet to calculate.” 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 box next to “Annual CO₂ emission from this unit type unit (metric tons).”For this method, Subpart Y also collects the basis for the carbon content valueIVT module. Equation Y-8 is presented in the CO₂ SUMMARY AND RESULT section of the page. You can hover over an element in the equation to reveal a definition of that element.

The Equation Y-8 Summary is presented in the screenshot below. You can hover over an element in the equation to reveal a definition of that element

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CO₂ Emissions Calculation: 98.253(c)(3) - Equation Y-11

The annual CO₂ emissions from the unit operations is required. To calculate this value download the spreadsheet by clicking the link titled “Use Y-11 spreadsheet to calculate.” 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 box next to “Annual CO₂ emission from this catalytic reforming unit (metric tons).”

For this method, Subpart Y also collects the total number of regeneration cycles or measurement periods, as well as the average coke burn-off quantity per cycle or measurement period.

The Equation Y-11 Summary is presented in the screenshot below. You can hover over an element in the equation to reveal a definition of that element.

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CH₄ Emissions Calculation: Equation Y-9

The annual CH₄ emissions from the unit operations is required. To calculate this value download the spreadsheet by clicking the link titled “Use Y-9 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 emission from this unit type unit (metric tons).”

The Equation Y-9 Summary is presented in the screenshot below. You can hover over an element in the equation to reveal a definition of that element.

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CH₄ Emissions Calculation: Unit-Specific Measurement Data

For the unit-specific measurement data method, Subpart Y collects the annual CH₄ emission from this unit (metric tons).

The CH₄ Summary (Measurement Data) is presented in the screenshot below.

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CH₄ Emissions Calculation: A Unit-Specific Emission Factor Based on a Source Test of the Unit

For the unit-specific emission factor based on a source test of the unit method, Subpart Y collects annual CH₄ emission from this unit (metric tons).

For this method Subpart Y also collects the basis for the CH₄ emission factor:

• Weekly or more frequent measurements
• Periodic (less frequent than weekly) measurements
• Average of multiple source tests
• One-time source test
• Other (specify)

The CH₄ Summary (Emission Factor Based on a Source Test) is presented in the screenshot below.

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N₂O Emissions Calculation: Equation Y-10

The annual N₂O emissions from the unit operations is required. To calculate this value download the spreadsheet by clicking the link titled “Use Y-10 spreadsheet to calculate.” Fill in the spreadsheet using the instructions in the spreadsheet. After completing the spreadsheet, copy the value of N₂O calculated by the spreadsheet to this page in the box next to “Annual N₂O emission from this unit type unit (metric tons).”

The Equation Y-10 Summary is presented in the screenshot below. You can hover over an element in the equation to reveal a definition of that element.

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Also in the CO₂ SUMMARY AND RESULT section, you will find a CO₂ data entry cell. Immediately below this data entry cell you will see a block labeled "Use Inputs Verifier to calculate" and a green GO button. To open the IVT module for Equation Y-8, click GO. See Subpart Y Entering Equation Inputs Using IVT for instructions on using the IVT modules, including the important steps of loading and saving your inputs verifier file.

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Enter the following information in the Equation Y-8 IVT module:

• Annual throughput of unit from company records (barrels/year)
• Coke Burn-off Factor selected from the following radio button options: 
  • Either 7.3 kb coke/bbl feed (default for catalytic cracking units) or 11 kg coke/bbl feed (default for fluid coking units)
  • Enter own value (kg coke/bbl feed)
• Carbon content of coke based on measurement or engineering estimate (default = 0.94) (kg C per kg coke)

Click SAVE to return to the GHG Data and Associated Information page. The value calculated by the IVT module will be displayed in the "Annual CO₂ emission from this fluid catalytic cracking unit" cell. Below this a checkbox labeled “Enter/Report Alternate Result will be displayed. Checking this checkbox will cause a data entry cell labeled “Enter Own Result” to appear in which you may enter a value that you consider to be more accurate than the one calculated by the IVT module.

When you have finished entering data for this unit, click SAVE to return to the Subpart Y Overview page.

CO₂ Emissions Calculation: 98.253(c)(3) - Equation Y-11

The annual CO₂ emissions from the unit operations are required and must be calculated using the Equation Y-11 IVT module. Equation Y-11 is presented in the CO₂ SUMMARY AND RESULT section of the page. You can hover over an element in the equation to reveal a definition of that element.

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Also in the CO₂ SUMMARY AND RESULT section, you will find a CO₂ data entry cell. Immediately below this data entry cell you will see a block labeled "Use Inputs Verifier to calculate" and a green GO button. To open the IVT module for Equation Y-11, click GO. See Subpart Y Entering Equation Inputs Using IVT for instructions on using the IVT modules, including the important steps of loading and saving your inputs verifier file.

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Enter the following information for each regenerative cycle or measurement period in the table in the Equation Y-11 IVT module:

• Regenerative Cycle/Measurement Period
• Coke burn-off quantity from engineering estimates (kg coke/cycle or kg coke/measurement period)
• Carbon content of coke based on measurement or engineering estimate (default = 0.94) (kg C/kg coke)

To add rows to the table, click on the green "+" icon that appears when you hover the cursor to the left of the blank row at the bottom of the table. To delete a row, click on the "x" icon that appears when you hover the cursor to the left of the row you wish to delete.

Click SAVE to return to the GHG Data and Associated Information page. The value calculated by the IVT module will be displayed in the IVT result data cell. Below this a checkbox labeled “Enter/Report Alternate Result" will be displayed. Checking this checkbox will cause a data entry cell labeled “Enter Own Result” to appear in which you may enter a value that you consider to be more accurate than the one calculated by the IVT module.

For this method, Subpart Y also collects the total number of regeneration cycles or measurement periods, as well as the average coke burn-off quantity per cycle or measurement period. The total number of regeneration cycles or measurement periods is calculated and entered automatically by e-GGRT using the data you entered in the IVT module. You must manually enter the average coke burn-off quantity per cycle or measurement period.

When you have finished entering data for this unit, click SAVE to return to the Subpart Y Overview page.

CH₄ Emissions Calculation: Equation Y-9

The annual CH₄ emissions from the unit operations is required. To calculate this value download the spreadsheet by clicking the link titled “Use Y-9 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 emission from this unit type unit (metric tons).”

The Equation Y-9 Summary is presented in the screenshot below. You can hover over an element in the equation to reveal a definition of that element.

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CH₄ Emissions Calculation: Unit-Specific Measurement Data

For the unit-specific measurement data method, Subpart Y collects the annual N₂O CH₄ emission from this unit (metric tons).

The N₂O CH₄ Summary (Measurement Data) is presented in the screenshot below.

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CH₄ Emissions Calculation: A Unit-Specific Emission Factor Based on a Source Test of the Unit

For the unitmethodology that uses a unit-specific emission factor based on a source test of the unit method, Subpart Y collects annual N₂O emission from this unit CH₄ emissions (metric tons).

For this method Subpart Y also collects the basis for the N₂O emission factor:

• Weekly or more frequent measurements
• Periodic (less frequent than weekly) measurements
• Average of multiple source tests
• One-time source test
• Other (specify)

, which must be calculated using the IVT module.

The GHG Emissions and Associated Information page for the CH₄ Summary (Emission The N₂O Summary (Emission Factor Based on a Source Test) methodology is presented in the screenshot below.

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See Also

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In the CH₄ SUMMARY (EMISSION FACTOR BASED ON A SOURCE TEST) section, you will find a CH₄ data entry cell. Immediately below this data entry cell you will see a block labeled "Use Inputs Verifier to calculate" and a green GO button. To open the IVT module for Equation Y-9 alternative inputs, click GO. See Subpart Y Entering Equation Inputs Using IVT for instructions on using the IVT modules, including the important steps of loading and saving your inputs verifier file.

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Enter the following information into the IVT module:

• Value of unit-specific CH₄ emission factor (in metric tons per activity unit; e.g., metric tons/bbl)
• Annual activity data (e.g., input or product rate)
• Unit of measure for the annual activity data (ensure consistent units of measure are used here and for the activity data (i.e., the denominator) used to calculate the emission factor. For example, if your emission factor is in metric tons/bbl then your annual activity data should be reported in units of bbl)

Click SAVE to return to the GHG Data and Associated Information page. The value calculated by the IVT module will be displayed in the IVT result data cell. Below this a checkbox labeled “Enter/Report Alternate Result" will be displayed. Checking this checkbox will cause a data entry cell labeled “Enter Own Result” to appear in which you may enter a value that you consider to be more accurate than the one calculated by the IVT module.

For this method Subpart Y also collects the basis for the CH₄ emission factor selected from the following dropdown box options:

• Weekly or more frequent measurements
• Periodic (less frequent than weekly) measurements
• Average of multiple source tests
• One-time source test
• Other (specify)

When you have finished entering data for this unit, click SAVE to return to the Subpart Y Overview page. 

N₂O Emissions Calculation: Equation Y-10

The annual N₂O emissions from the unit operations is required. To calculate this value download the spreadsheet by clicking the link titled “Use Y-10 spreadsheet to calculate.” Fill in the spreadsheet using the instructions in the spreadsheet. After completing the spreadsheet, copy the value of N₂O calculated by the spreadsheet to this page in the box next to “Annual N₂O emission from this unit type unit (metric tons).”

The Equation Y-10 Summary is presented in the screenshot below. You can hover over an element in the equation to reveal a definition of that element.

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N₂O Emissions Calculation: Unit-Specific Measurement Data

For the unit-specific measurement data method, Subpart Y collects the annual N₂O emission from this unit (metric tons).

The N₂O Summary (Measurement Data) is presented in the screenshot below.

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N₂O Emissions Calculation: A Unit-Specific Emission Factor Based on a Source Test of the Unit

For the methodology that uses a unit-specific emission factor based on a source test, Subpart Y collects annual N₂O emissions (metric tons), which must be calculated using the IVT module.

The GHG Emissions and Associated Information page for the N₂O Emission Factor Based on a Source Test methodology is presented in the screenshot below.

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In the N₂O SUMMARY (EMISSION FACTOR BASED ON A SOURCE TEST) section, you will find a N₂O data entry cell. Immediately below this data entry cell you will see a block labeled "Use Inputs Verifier to calculate" and a green GO button. To open the IVT module for Equation Y-10 alternative inputs, click GO. See Subpart Y Entering Equation Inputs Using IVT for instructions on using the IVT modules, including the important steps of loading and saving your inputs verifier file.

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Enter the following information into the IVT module:

• Value of unit-specific N₂O emission factor (in metric tons per activity unit; e.g., metric tons/bbl)
• Annual activity data (e.g., input or product rate)
• Unit of measure for the annual activity data (ensure consistent units of measure are used here and for the activity data (i.e., the denominator) used to calculate the emission factor. For example, if your emission factor is in metric tons/bbl then your annual activity data should be reported in units of bbl)

Click SAVE to return to the GHG Data and Associated Information page.

For this method Subpart Y also collects the basis for the N₂O emission factor selected from the following dropdown box options:

• Weekly or more frequent measurements
• Periodic (less frequent than weekly) measurements
• Average of multiple source tests
• One-time source test
• Other (specify)

When you have finished entering data for this unit, click SAVE to return to the Subpart Y Overview page. 

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See Also

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Using e-GGRT to Prepare Your Subpart Y Report