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Subpart Y requires you to report the following data about your asphalt blowing operations:
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:
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When you are finished, click SAVE.
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Note: if you selected Vapor scrubber or None as the asphalt blowing operations control device, you must use Equations Y-14 and Y-15 , so no options are provided |
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-19 (Process Vent). |
To add or update emissions for your asphalt blowing unit, locate the ASPHALT BLOWING UNIT-LEVEL EMISSION SUMMARY table on the Subpart Y Overview page, and click OPEN.
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For asphalt blowing operations, you must calculate CO2 and CH4 emissions.
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
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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:
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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 emissions emission from this asphalt blowing unit (metric tons)" or "Annual CH4 emissions emission from this asphalt blowing unit (metric tons)," as appropriate.
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- 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)
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Note: If using the process vent method for an asphalt blowing unit, enter your CO2 and CH4 emissions on this page. For the entries regarding the emissions factor basis used, choose "Other" and add "Process Vent Method" to the text box that appearsif 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 emissions emission from this asphalt blowing unit (metric tons)" or "Annual CH4 emissions emission from this asphalt blowing unit (metric tons)," as appropriate.
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- 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)
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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 emissions emission from this asphalt blowing unit (metric tons)" or "Annual CH4 emissions 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.
Both the 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)
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Note that number of venting events is not applicable for continuous venting in which case you may leave this field blank |
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Note: If using the process vent method for an asphalt blowing unit, enter your CO2 and CH4 emissions on this page. For the entries regarding the emissions factor basis used, choose "Other" and add "Process Vent Method" to the text box that appears. |
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 value values displayed is are for informational purposes only.
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