These optional spreadsheets are provided to assist reporters in calculating emissions and in keeping records of these calculations.
Reporters are required to keep records of these calculations under 40 CFR 98.3(g) and additional subpart-specific provisions, but are not required to use these spreadsheets or to submit any spreadsheets to EPA.
Overview
This help page provides guidance for working with the supplemental Subpart X calculation spreadsheets. The spreadsheets calculate the CO2 process emissions in accordance with Equations X-1 through X-4 in subpart X. A facility must use these equations to calculate emissions when complying with the mass balance option in subpart X. As stated in §98.242, process emissions for the mass balance option are the total CO2 generated in the process itself plus the CO2 generated by combustion of off-gas from the process. The guidance provides step-by-step instructions for the following tasks:
- Selecting the Appropriate Calculation Spreadsheet
- Downloading a Calculation Spreadsheet
- General Information on Using a Calculation Spreadsheet
- Using the Equation X-1 Calculation Spreadsheet
- Using the Equation X-2 Calculation Spreadsheet
- Using the Equation X-3 Calculation Spreadsheet
- Using the Equation X-4 Calculation Spreadsheet
Specific information on each of the calculation spreadsheets is provided below:
Calculation Spreadsheet | Calculation | Selection Criteria: | Instructions |
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Net Contribution to Calculated Emissions from Carbon Materials | Gaseous | ||
Net Contribution to Calculated Emissions from Carbon Materials | Liquid | ||
Net Contribution to Calculated Emissions from Carbon Materials | Solid | ||
Annual CO2 Emissions | N/A |
Subpart X requires a facility to report annual CO2 process emissions from each process unit used to produce petrochemicals. To calculate emissions from a process unit, users must first calculate the annual net contribution to calculated emissions from carbon in gaseous, liquid, and solid feedstocks and products using calculation spreadsheets for equations X-1, X-2, and X-3, respectively. Once completed, users should then copy the results from those spreadsheets into the Equation X-4 Calculation Spreadsheet. This sequence must be repeated for each process unit.
For each process unit with any gaseous feedstocks or products, users should calculate the annual net contribution to calculated emissions from the gaseous carbon materials using Equation X-1 and the Equation X-1 Calculation Spreadsheet. Equation X-1 is provided below:
(Equation X-1) |
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For each process unit with any liquid feedstocks or products, users should calculate the annual net contribution to calculated emissions from the liquid carbon materials using Equation X-2 and the Equation X-2 Calculation Spreadsheet. Equation X-2 is provided below:
(Equation X-2) |
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For each process unit with any solid feedstocks or products, users should calculate the annual net contribution to calculated emissions from the solid carbon materials using Equation X-3 and the Equation X-3 Calculation Spreadsheet. Equation X-3 is provided below:
(Equation X-3) |
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For each process unit, users should calculate the annual CO2 mass emissions from process operations and process off-gas combustion using Equation X-4 and the Equation X-4 Calculation Spreadsheet. Equation X-4 is provided below:
(Equation X-4) |
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Calculation spreadsheets for Subpart X may be downloaded by clicking one of the links in the first column of the table below. Users may also jump to instructions for each calculation spreadsheet by clicking one of the links in the third column.
Calculation Spreadsheet | Calculation | Selection Criteria: | Instructions |
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Net Contribution to Calculated Emissions from Carbon Materials | Gaseous | ||
Net Contribution to Calculated Emissions from Carbon Materials | Liquid | ||
Net Contribution to Calculated Emissions from Carbon Materials | Solid | ||
Annual CO2 Emissions | N/A |
The guidance provided in this section applies to each of the calculation spreadsheets for Subpart X. Additional guidance is provided for each individual calculation spreadsheet in the sections below.
Color coding
The calculation spreadsheets contain green input cells, gray informational cells, and red-bordered results cells filled with yellow or white. Users should use green input cells to enter all data specific to their facility, unit, or process. Gray informational cells contain parameter names, column and row headings, equation constants and subtotals. Calculation results are displayed in red-bordered results cells filled with yellow or white. For red-bordered, yellow-filled results cells, the values in these cells should be entered in the appropriate and separate calculation spreadsheet (as directed below cell) where additional calculations will be made. For red-bordered, white filled results cells, the values in these cells should be entered in e-GGRT for the appropriate process units. All cells that are not green input cells are locked and cannot be modified.
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Green input cell (data entry) |
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Gray informational cells (locked) |
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Red-bordered, yellow-filled results cells (enter in appropriate and separate calculation spreadsheet) |
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Red-bordered, white filled results cells (enter in e-GGRT) |
Stop and Warning Messages
The calculation spreadsheets will display a stop message if the user enters a value that is invalid or a warning message if the user enters a value outside the EPA estimated range for a particular data element. For invalid data entries, the stop messages will not allow a user to proceed and the user must reenter valid data before moving forward. For data entries that are outside the EPA estimated range for a particular data element, the warning messages will allow a user to proceed if the user deems the entered value to be accurate.
Multiple Process Units
Users with multiple process units should use separate calculation spreadsheets for each process unit. Users should not aggregate data for multiple process units when using these calculation spreadsheets.
Calculate the annual net contribution to calculated emissions from carbon materials for each process unit with gaseous feedstocks and/or products using Equation X-1 and the Equation X-1 Calculation Spreadsheet. Space is provided for up to three gaseous feedstocks and three gaseous products in the spreadsheet. Use additional copies of this spreadsheet for additional materials and add the contributions prior to entering in the Equation X-4 Calculation Spreadsheet. Equation X-1 is provided below:
(Equation X-1) |
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Begin by entering the facility name, your name, the process unit name or identifier, the unit type, the reporting period, and any additional comments in the green input cells of the general information table located immediately below the equation in the calculation spreadsheet. This is for your records.
Next, enter the requested information in the green input cells in the General Input Data table.
Next, enter the requested information in the green input cells in the Input Data for Feedstocks table.
Then, enter the requested information in the green input cells in the Input Data for Products table.
The calculation spreadsheet will calculate the net contribution to calculated emissions from all carbon-containing gaseous feedstocks and products in a process unit. This calculated value will be displayed in the red-bordered cell with yellow fill at the bottom of the spreadsheet. This value should be entered in the Equation X-4 Calculation Spreadsheet for this process unit.
Calculate the annual net contribution to calculated emissions from carbon materials for each process unit with liquid feedstocks and/or products using Equation X-2 and the Equation X-2 Calculation Spreadsheet. Space is provided for up to three liquid feedstocks and three liquid products in the spreadsheet. Use additional copies of this spreadsheet for additional materials and add the contributions prior to entering in the Equation X-4 Calculation Spreadsheet. Equation X-2 is provided below:
(Equation X-2) |
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Begin by entering the facility name, your name, the process unit name or identifier, the unit type, the reporting period, and any additional comments in the green input cells of the general information table located immediately below the equation in the calculation spreadsheet. This is for your records.
Next, enter the requested information in the green input cells in the Input Data for Feedstocks table.
Then, enter the requested information in the green input cells in the Input Data for Products table.
The calculation spreadsheet will calculate the net contribution to calculated emissions from all carbon-containing liquid feedstocks and products in a process unit. This calculated value will be displayed in the red-bordered cell with yellow fill at the bottom of the spreadsheet. This value should be entered in the Equation X-4 Calculation Spreadsheet for this process unit.
Calculate the annual net contribution to calculated emissions from carbon materials for each process unit with solid feedstocks and/or products using Equation X-3 and the Equation X-3 Calculation Spreadsheet. Space is provided for up to three solid feedstocks and three solid products in the spreadsheet. Use additional copies of this spreadsheet for additional materials and add the contributions prior to entering in the Equation X-4 Calculation Spreadsheet. Equation X-3 is provided below:
(Equation X-3) |
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Begin by entering the facility name, your name, the process unit name or identifier, the unit type, the reporting period, and any additional comments in the green input cells of the general information table located immediately below the equation in the calculation spreadsheet. This is for your records.
Next, enter the requested information in the green input cells in the Input Data for Feedstocks table.
Then, enter the requested information in the green input cells in the Input Data for Products table.
The calculation spreadsheet will calculate the net contribution to calculated emissions from all carbon-containing solid feedstocks and products in a process unit. This calculated value will be displayed in the red-bordered cell with yellow fill at the bottom of the spreadsheet. This value should be entered in the Equation X-4 Calculation Spreadsheet for this process unit.
Calculate the annual mass of CO2 process emissions using the results from the X-1, X-2, and X-3 calculation spreadsheets in Equation X-4, and the Equation X-4 Calculation Spreadsheet. Equation X-4 is provided below:
(Equation X-4) |
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Begin by entering the facility name, your name, the process unit name or identifier, the unit type, the reporting period, and any additional comments in the green input cells of the general information table located immediately below the equation in the calculation spreadsheet. This is for your records.
Next, enter the requested information in the green input cells in the Input Data for Feedstocks table.
The calculation spreadsheet will calculate the annual CO2 process emissions in metric tons per year for a process unit. This calculated value will be displayed in the red-bordered cell with white fill at the bottom of the spreadsheet. This value should be entered in e-GGRT for this process unit.
