Greenhouse Gas Reporting Help

Subpart Y Delayed Coking Unit Information for RY2018 and Later Years

Created by Isaac Locke on Dec 17, 2020

This topic provides a step-by-step description of how to enter Subpart Y Delayed Coking unit information about this facility. For reporting years 2018 and future years.

Data reporting for delayed coking is not limited to this section. Data for delayed coking processes must be entered in the, “Delayed Coking Unit Information” tab of the Subpart Overview page.

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Adding or Updating Delayed Coking Unit Information

To add or update Subpart Y Delayed Coking Unit Information for this Facility, click the link titled "ADD a Delayed Coking Unit" below the DELAYED COKING UNITS table on the Subpart Y Overview page.

To edit an existing Delayed Coking Unit, click on the edit icon or the Name/ID link in the first column in the DELAYED COKING UNITS table.

To delete an existing Delayed Coking Unit, click on the delete icon in the last column in the DELAYED COKING UNITS table.

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Subpart Y requires you to report the following data for each delayed coking unit at your facility:

A unique name or identifier, plus optional description. See also About Unique Unit Names
Maximum rated throughput of Delayed Coking Units (measured as bbl/stream day)
The total number of associated delayed coking vessels (or coke drums)
Several radio buttons are required on this screen:

Basis for the typical dry mass of coke at the end of the coking cycle.

Calculated using Equation Y-18a
Mass measurements from company records

Method used to estimate the average temperature of the coke bed (T_int).

Overhead temperature, Equation Y-18c
Pressure correlation and Equation Y-18d

Type of emission factor was used in Equation Y-18f.

Unit-specific factor
Default factor

Note: Responses to the following questions will be included in your annual report and are necessary so that the Inputs Verifier Tool can collect only the necessary data for Equations Y-18a, Y-18b, Y-18c, Y-18d, Y-18e, and Y-18f, as appropriate.

When you are finished entering the required information, click SAVE.

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Adding or Updating Delayed Coking Emissions

To add or update Delayed Coking Emissions for a delayed coking unit, locate the unit in the DELAYED COKING UNITS table on the Subpart Y Overview page, and click OPEN next to the specific Delayed Coking Unit. The following page will appear.

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After entering the annual quantity of coke produced, select the green, "GO" button to open the "EQUATION Y-18f SUMMARY AND RESULT IVT PAGE

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Depending on the radio button selection made while configuring the DCU equipment on the “ADD a Delayed Coking Unit” page, the “Delayed Coking Emissions” page will contain certain boxes in the “inputs to Equation Y-18a, 18b, 18c, 18d, 18e, and 18” IVT section which are highlighted in white for data entry. Note that all data elements may be edited (indicated by the gray shading), including IVT calculated results.

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A user may enter their own calculated result if they believe IVT has miscalculated the Annual methane emission from decoking operations.

Once the information produced by the IVT calculations is correct, click “SAVE”. This will return you to the Subpart Overview Page.

Repeat this step until you have entered information for all coking drums for this delayed coking unit.

When finished, click SAVE.

Adding or Updating Delayed Coking Unit Information

Adding or Updating Delayed Coking Emissions

See Also