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:

Selecting the Appropriate Calculation Spreadsheet

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:

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:

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:

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:

Downloading a Calculation Spreadsheet

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.

Using a Calculation Spreadsheet to Make Calculations

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.

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.

Using the Equation X-1 Calculation Spreadsheet

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:

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.

Using the Equation X-2 Calculation Spreadsheet

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:

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.

Using the Equation X-3 Calculation Spreadsheet

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:

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.

Using the Equation X-4 Calculation Spreadsheet

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:

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.

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