Subpart Y Asphalt Blowing Unit Information


This topic provides a step-by-step description of how to enter Subpart Y Asphalt Blowing unit information about this facility

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Adding or Updating Asphalt Blowing Information

To add or update Subpart Y Asphalt Blowing Information for this Facility, locate the ASPHALT BLOWING UNIT-LEVEL EMISSIONS SUMMARY table on the Subpart Y Overview page.

Click the link titled "ADD an Asphalt Blowing Unit."

To edit an existing Asphalt Blowing Unit, click on the edit icon or the Name/ID link, which is the first column in the ASPHALT BLOWING UNIT-LEVEL EMISSIONS SUMMARY table.

To delete an existing Asphalt Blowing Unit, click on the delete icon, which is the last column in the ASPHALT BLOWING UNIT-LEVEL EMISSIONS SUMMARY table.

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Subpart Y requires you to report the following data about your asphalt blowing operations:

  • A unique name or identifier, plus optional description for this asphalt blowing unit. See also About Unique Unit Names.
  • Specify the control device used to reduce methane (and other organic) emissions from the unit. Select from Vapor scrubber, Thermal oxidizer, Flare, Other (specify), or None.

When you are finished, click SAVE.

If you selected Thermal oxidizer, Flare, or Other, an additional question will appear requiring you to select a CO2 AND CH4 EMISSIONS CALCULATION METHOD. The system requires you to select the method used to calculate the CO2 and CH4 emissions for your asphalt blowing operations from the following list:

  • Equations Y-14 and Y-15 (appears only if Other was selected)
  • Equations Y-16a and Y-17
  • Equations Y-16b and Y-17
  • Equation Y-19 (Process Vent)

When you are finished, click SAVE.

Note: if you selected Vapor scrubber or None as the asphalt blowing operations control device, you must use Equations Y-14 and Y-15 or Y-19 (Process Vent).

The emissions entry screen presented will be dependent on the type of control device selected and, if necessary, the calculation method selected.

Adding or Updating Asphalt Blowing Emissions Information

Step 1: Asphalt Blowing Operations Emissions Summary and Result

If Equation Y-14 and Y-15 is required or chosen, then you will be prompted with the Equation Y-14/Y-15 Summary and Result page.

If Equation Y-16a is chosen then you will be prompted with the Equation Y-16a/Y-17 Summary and Result page.

If Equation Y-16b is chosen then you will be prompted with the Equation Y-16b/Y-17 Summary and Result page.

If Equation Y-19 (Process Vent) is chosen then you will be prompted with the Equation Y-19 (Process Vent) Summary and Result page.

Data entry instructions for each of these pages follow:

Step 1a: Equation Y-14/Y-15 Summary and Result

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The annual CO2 and CH4 emissions from asphalt blowing operations are required. To calculate this value download the appropriate spreadsheet by clicking the link titled “Use Y-14 spreadsheet to calculate” for CO2 or “Use Y-15 spreadsheet to calculate” for CH4. Fill in the spreadsheet using the instructions in the spreadsheet. After completing each respective spreadsheet, copy the values of CO2 and CH4 calculated by the spreadsheet to this page in the box next to “Annual CO2 emission from this asphalt blowing unit (metric tons)” or “Annual CH4 emission from this asphalt blowing unit (metric tons),” as appropriate.

The Equation Y-14/Y-15 Summaries are presented on the page. You can hover over an element in the equation to reveal a definition of that element.

Both the CO2 and CH4 emission factors require a basis:

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

Note: if you selected Vapor scrubber or None as the asphalt blowing operations control device, you must use Equations Y-14 and Y-15 or Y-19 (Process Vent).

Step 1b: Equation Y-16a / Y-17 Summary and Result

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The annual CO2 and CH4 emissions from asphalt blowing operations are required. To calculate this value download the appropriate spreadsheet by clicking the link titled “Use Y-16a spreadsheet to calculate” for CO2 or “Use Y-17 spreadsheet to calculate” for CH4. Fill in the spreadsheet using the instructions in the spreadsheet. After completing each respective spreadsheet, copy the values of CO2 and CH4 calculated by the spreadsheet to this page in the box next to “Annual CO2 emission from this asphalt blowing unit (metric tons)” or “Annual CH4 emission from this asphalt blowing unit (metric tons),” as appropriate.

The Equation Y-16a/Y-17 Summaries are presented on the page. You can hover over an element in the equation to reveal a definition of that element.

Both the CO2 and CH4 emission factors require a basis:

  • Used default emission factor
  • Weekly or more frequent measurements
  • Periodic (less frequent than weekly) measurements
  • Average of multiple source tests
  • One-time source test
  • Other (specify)
Step 1c: Equation Y-16b/Y-17 Summary and Result

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The annual CO2 and CH4 emissions from asphalt blowing operations are required. To calculate this value download the appropriate spreadsheet by clicking the link titled “Use Y-16b spreadsheet to calculate” for CO2 or “Use Y-17 spreadsheet to calculate” for CH4. Fill in the spreadsheet using the instructions in the spreadsheet. After completing each respective spreadsheet, copy the value of CO2 and CH4 calculated by the spreadsheet to this page in the box next to “Annual CO2 emission from this asphalt blowing unit (metric tons)” or “Annual CH4 emission from this asphalt blowing unit (metric tons),” as appropriate.

The Equation Y-16b/Y-17 Summaries are presented on the page. You can hover over an element in the equation to reveal a definition of that element.

The CO2, carbon, and CH4 emission factors require a basis:

  • Used default emission factor
  • Weekly or more frequent measurements
  • Periodic (less frequent than weekly) measurements
  • Average of multiple source tests
  • One-time source test
  • Other (specify)
Step 1d: Equation Y-19 (Process Vent) Summary and Result

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The annual CO2 and CH4 emissions from asphalt blowing operations are required. To calculate this value download the appropriate 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 values of CO2 and CH4 calculated by the spreadsheet to this page in the box next to “Annual CO2 emission from this process vent (metric tons)" or “Annual CH4 emission from this process vent (metric tons)" as appropriate.

The Equation Y-19 (Process Vent) 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 about your asphalt blowing unit process vent:

  • 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, if vent is intermittent (see note below)
  • Cumulative venting time (hours)
  • Annual average mole fraction of CO2
  • Method used to measure or estimate the annual average mole fraction of CO2:
    • Engineering estimates/process knowledge
    • Direct measurement
    • Other (specify)
  • Annual average mole fraction of CH4
  • Method used to measure or estimate the annual average mole fraction of CH4:
    • Engineering estimates/process knowledge
    • Direct measurement
    • Other (specify)

Note that number of venting events is not applicable for continuous venting in which case you may leave this field blank.

Step 2: Save Your Data

When you have finished entering Asphalt Blowing Operations Emissions Summary and Result, click SAVE.

After you save the data on this page, the next time you open the page, the calculators on the top of the page will display the CO2 and CH4 emissions, rounded to the nearest 0.1 and 0.01 of a metric ton, respectively. The values displayed are for informational purposes only.

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See Also

Screen Errors
Using e-GGRT to Prepare Your Subpart Y Report
Subpart Y Summary Information for this Facility
Subpart Y Delayed Coking Unit Information
Subpart Y Asphalt Blowing Unit Information
Subpart Y Coke Calcining Unit Information
Subpart Y Catalytic Cracking, Fluid Coking, and Catalytic Reforming Unit Information
Subpart Y Flares Unit Information
Subpart Y Process Vents Unit Information
Subpart Y Sulfur Recovery Plant Information
Subpart Y Emissions Information for Process Units Monitored by CEMS
Subpart Validation Report

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