This page provides a step-by-step description of how to enter Subpart NN GHG data for NGL Fractionators.

The GHG information required for NGL Fractionators includes four steps:

• Step B1 - Indicate NGL Products Supplied
• Step B2 - Calculation Methodology
• Step B3:
  • Step B3.1 - Equation NN-1 Summary and Results
    OR
  • Step B3.2 - Equation NN-2 Summary and Results
• Step B4 - Equation NN-7 Summary and Results
• Step B5 - Equation NN-8 Summary and Results

The steps required to complete your fractionator report include the use of either Step B3.1 or Step B3.2, but not both.

Your selection of a calculation methodology in Step B1 will determine whether e-GRRT uses Step B3.1 or Step B3.2 to calculate CO₂ quantities from each NGL product supplied.

Each step is described below.

Step B1 - Indicate NGL Products Supplied

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First, you must select the product types supplied by your fractionator. Click this link to view definitions of these products.

By default, all products will be selected for you, or the products that you reported supplying last year will be selected. To deselect a product that you did not supply in the reporting year, locate the check box to the left of the name of the product and click on it.

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This screen provides a warning that by deselecting a particular product, the GHG quantity associated with that product will not be included in the GHG report for this supplier during the reporting year.

If you wish to proceed with deselecting this product, click “DESELECT”. If you do supply this product, you would click “CANCEL”.

Regardless of which selection you make, you will be returned to the Subpart NN overview page.

Step B2 - Calculation Methodology

Repeat Steps B2 through B5 for each product supplied by your facility during the reporting year.

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Find the table titled "GHG SUMMARY" and click the OPEN button adjacent to the name of the product to begin entering GHG data for this product.

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Use the radio buttons to select the methodology used to calculate the potential CO₂ quantity associated with the complete combustion or oxidation of this product.

Methodology 1 uses a higher heating value and CO₂ emissions factor based on heat content to calculate the CO₂ quantity associated with this product.

Methodology 2 uses a CO₂ emissions factor based on product volume to calculate the CO₂ quantity associated with this product.

Based on your selection, e-GRRT will use either Equation NN-1 (if Methodology 1 is selected) or Equation NN-2 (if Methodology 2 is selected) to calculate the potential CO₂ quantity associated with this product.

When finished, click NEXT.

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Once you arrive on the Equation NN-8 Summary page, click NEXT

Step B3.1 - Equation NN-1 Summary and Results

This section provides instructions for users that selected Methodology 1 in Step B1. If you selected Methodology 2 in Step B1, skip to Step B3.2: Equation NN-2 Summary and Results.

If you selected Methodology 1 in Step B1, e-GGRT will guide you to the page containing Subpart NN Equation NN-1 where you can use the radio buttons to indicate the source of reported the CO₂ quantity associated with this product.

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If you elect to enter your own result, select the radio button "Enter my own result," enter the CO₂ quantity associated with this product (in metric tons) in the space provided, and then click NEXT to advance to the next screen. If you choose to use eGGRT to calculate the result for you, make sure the radio button "Use the calculated result rounded" is selected and click NEXT.

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In the spaces provided, enter the total annual volume of this product supplied (in barrels) and the number of days during the reporting year for which substitute data procedures were used to determine this value.

Use the drop-down menu to select the industry standard(s) used to measure the volume. If you select "Other" from the drop down menu, enter the name or a short description of the method you used.
When finished, click NEXT.

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Use the radio buttons to indicate your source for the higher heating value and CO₂ emissions factor.

If you elect not to use the default values, in the spaces provided, enter your own higher heating value (in million Btu per barrel) and/or CO₂ emissions factor (in kilograms of CO₂ per million Btu) as well as the number of days during the reporting year for which substitute data procedures were used to determine these value(s). Use the drop-down menu(s) to select the industry standard(s) used to measure the higher heating value and/or CO₂ emissions factor. If you select "Other" from the drop-down menu, enter the name or a short description of the method you used.

When finished, click NEXT.

You may now skip to Step B4 of these instructions

Step B3.2 - Equation NN-2 Summary and Results

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If you selected Methodology 2 in Step B2, e-GGRT will guide you to the page containing Subpart NN Eq. NN-2 where you can use the radio buttons to indicate the source of the potential CO₂ quantity associated with this product.

If you elect to enter your own result, select the radio button "Enter my own result," enter the CO₂ quantity associated with this product (in metric tons) in the space provided, and then click NEXT to advance to the next screen. If you choose to use eGGRT to calculate the result for you, make sure the radio button "Use the calculated result rounded" is selected and click NEXT.

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In the spaces provided, enter the total annual volume of this product supplied (in barrels) and the number of days during the reporting year for which substitute data procedures were used to determine this value.

Use the drop-down menu to select the industry standard used to measure the volume. If you select "Other" from the drop-down menu, enter the name or a short description of the method you used.
When finished, click NEXT.

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Use the radio buttons to indicate your source for the CO₂ emissions factor.

If you elect not to use the default value, enter your own CO₂ emissions factor (in metric tons CO₂ per barrel) along with the number of days missing data procedures were used to determine this value in the spaces provided.

Then use the drop-down menu to select the industry standard used to measure this value. If you select "Other" from the drop-down menu, enter the name or a short description of the method you used.

When finished, click NEXT.

Step B4 - Equation NN-7 Summary and Results

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On the Subpart NN Equation NN-7 overview page, use the radio buttons to indicate the source of the potential CO₂ quantity associated with the quantity of this product received from other fractionators.

If you elect to enter your own result, select the radio button "Enter my own result," enter the potential CO₂ quantity associated with this product received from other fractionators (in metric tons) in the space provided, and then click NEXT to advance to the next screen. If you choose to use eGGRT to calculate the result for you, make sure the radio button "Use my own result rounded" is selected and click NEXT.

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In the spaces provided, enter the total annual volume of this product received from other fractionators (in barrels) and the number of days during the reporting year for which substitute data procedures were used to determine this value. If your facility did not receive this product during the reporting year, enter "0" for each parameter in the spaces provided.

When finished, click NEXT.

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Use the radio buttons to indicate your source for the CO₂ emissions factor.

If you elect not to use the default value, use the space provided to enter your own CO₂ emissions factor (in metric tons CO₂ per barrel) and the number of days during the reporting year for which substitute data procedures were used to determine this value.

Use the drop-down menu to select the industry standard used to measure CO₂ emissions factor. If you select "Other" from the drop-down menu, enter the name or a short description of the method you used.

When finished, click NEXT.

Step B5 - Equation NN-8 Summary and Results

e-GGRT will use the calculated results from Equations NN-1 or NN-2, and NN-7 in Equation NN-8 to calculate potential CO₂ quantities associated with each fractionated NGL product delivered to customers.

Review the results of both of these equations as well as the result of equation NN-8.

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When you are satisfied that all entered data for this product is correct, click FINISHED.

Next, enter the information for all additional NGL products that you supply by following the procedures described above. If you need to change any of the data entered for a product, click the OPEN button adjacent to the name of the product.

Once you have finished entering data for all products supplied, and clicked FINISHED after each one, you will have completed reporting Subpart NN GHG Information for this fractionator.

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See Also

Screen Errors
Using e-GGRT to Prepare Your Subpart NN Report
Subpart NN Summary Information for this Supplier
Subpart NN Miscellaneous Information
Subpart NN LDC GHG Information
Subpart NN Fractionator GHG Information
Subpart Validation Report

Subpart W Data populated from Subpart NN Data