Subpart Y Asphalt Blowing Unit Information for RY2018 and Later Years


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 UNITS 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 UNITS EMISSIONS SUMMARY table.

To delete an existing Asphalt Blowing Unit, click on the delete icon, which is the last column in the ASPHALT BLOWING UNITS 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
    • Other non-combustion control device
    • Thermal oxidizer
    • Flare
    • Other vapor combustion control device
    • None

When you are finished, click SAVE.

After you specify the control device, 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:

  • If VAPOR SCRUBBER is selected, options for equations Y-14/Y-15 or equation Y-19 (Process Vent) are available.
  • If OTHER NON-COMBUSTION CONTROL DEICE is selected, options for equations Y-14/Y-15 or equation Y-19 (Process Vent) are available.
  • If THERMAL OXIDIZER is selected, options for equations Y-16a/Y-17, equations Y-16b/Y-17, or equation Y-19 (Process Vent) are available.
  • If FLARE is selected, options for equations Y-16a/Y-17, equations Y-16b/Y-17, or equation Y-19 (Process Vent) are available.
  • If OTHER VAPOR COMBUSTION CONTROL DEVICE is selected, Y-16a/Y-17, equations Y-16b/Y-17, or equation Y-19 (Process Vent) are available.
  • If NONE is selected, options for equations Y-14/Y-15 or equation Y-19 (Process Vent) are available.


When you are finished, click SAVE.


The emissions entry screen presented will be dependent on the type of control device selected and 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 Equation Y-14/Y-15 SUMMARY AND RESULT sections are presented on the page. You can hover over an element in the equation to reveal a definition of that element. The annual CO2 and CH4 emissions from asphalt blowing operations are required and must be calculated using the Inputs Verifier Tool (IVT) from the equation inputs you enter.

Before you can access the respective IVT modules for Equation Y-14 and Y-15, you must select the basis for the CO2 and CH4 emission factors from the following options in the dropdown box for each equation:

  • 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)

In the EQUATION Y-14 SUMMARY AND RESULT section, you will find a data entry cell labeled "Annual CO2 emissions from this asphalt blowing unit." 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-14, 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 IVT module for Equation Y-14 and click SAVE:

  • Quantity of asphalt blown (million barrels per year)
  • Emission factor for CO2 from uncontrolled asphalt blowing from facility-specific test (default = 1,100) (metric tons CO2/MMbbl asphalt blown)

Similarly, access the IVT module for Equation Y-15 by clicking the green GO button beneath the data entry cell labeled "Annual CH4 emissions from this asphalt blowing unit" in the EQUATION Y-15 SUMMARY AND RESULT section. In the IVT module enter:

  • Emission factor for CH4 from uncontrolled asphalt blowing from facility-specific test (default = 580) (metric tons CH4/MMbbl asphalt blown)
Step 1b: Equation Y-16a/Y-17 Summary and Result

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. The annual CO2 and CH4 emissions from asphalt blowing operations are required and must be calculated using the Inputs Verifier Tool (IVT) from the equation inputs you enter.

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Before you can access the respective IVT modules for Equation Y-16a and Y-17, you must select the basis for the CO2, carbon, and CH4 emission factors from the following dropdown box options:

  • 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)

In the EQUATION Y-16a SUMMARY AND RESULT section, you will find a data entry cell labeled "Annual CO2 emissions from this asphalt blowing unit." 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-16a, 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 IVT module for Equation Y-16a and click SAVE:

  • Quantity of Asphalt Blown (million barrels per year)
  • Carbon emission factor from asphalt blowing from facility-specific test (default = 2,750) (metric tons C/MMbbl asphalt blown)

Similarly, access the IVT module for Equation Y-17 by clicking the green GO beneath the data entry cell labeled "Annual CH4 emissions from this asphalt blowing unit" in the EQUATION Y-15 SUMMARY AND RESULT section. In the IVT module enter:

  • Emission factor for CH4 from uncontrolled asphalt blowing from facility-specific test (default = 580) (metric tons CH4/MMbbl asphalt blown)

(Note: The IVT will use a value of 0.02 for the fraction of methane uncombusted in thermal oxidizer or flare based on assumed 98% combustion efficiency in addition to the above equation input value in this equation calculation.) 

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

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 annual CO2 and CH4 emissions from asphalt blowing operations are required and must be calculated using the Inputs Verifier Tool (IVT) from the equation inputs you enter.

Click this link to expand

Before you can access the respective IVT modules for Equation Y-16b and Y-17, you must select the basis for the CO2, carbon, and CH4 emission factors from the following dropdown box options:

  • 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)

In the EQUATION Y-16b SUMMARY AND RESULT section, you will find a data entry cell labeled "Annual CO2 emissions from this asphalt blowing unit." 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-16b, 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 IVT module for Equation Y-16b and click SAVE:

  • Quantity of Asphalt Blown (million barrels per year)
  • Emission factor for CO2 from uncontrolled asphalt blowing from facility-specific test data (default = 1,100) (metric tons CO2/MMbbl asphalt blown)
  • Carbon emission factor from asphalt blowing from facility-specific test (default = 2,750) (metric tons C/MMbbl asphalt blown)

Similarly, access the IVT module for Equation Y-17 by clicking the green GO beneath the data entry cell labeled "Annual CH4 emissions from this asphalt blowing unit" in the EQUATION Y-15 SUMMARY AND RESULT section. In the IVT module enter:

  • Emission factor for CH4 from uncontrolled asphalt blowing from facility-specific test (default = 580) (metric tons CH4/MMbbl asphalt blown)

(Note: The IVT will use a value of 0.02 for the fraction of methane uncombusted in thermal oxidizer or flare based on assumed 98% combustion efficiency in addition to the above equation input value in this equation calculation.)  

When you have finished entering data in an IVT module, click SAVE to return to the GHG DATA AND ASSOCIATED INFORMATION page for the Asphalt Blowing unit. 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.

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 Code
Using e-GGRT to Prepare Your Subpart Y Report

 

e-GGRT -- Help -- FAQ -- FLIGHT -- GHGRP

This web site is maintained by a contractor to the U.S. Environmental Protection Agency (RY2023.R.01)