This page provides an overview of subtopics that are central to Subpart Y reporting:

• #Subpart Y Summary Information for this Facility
• #Subpart Y Delayed Coking Unit Information
• #Subpart Y Asphalt Blowing Unit Information
• #Subpart Y Coke Calcining Unit Information
• #Subpart Y Catalytic Cracking, Fluid Coking, and Catalytic Reforming Unit Information
• #Subpart Y Flares Unit Information
• #Subpart Y Process Vents Unit Information
• #Subpart Y Sulfur Recovery Plant Information
• #Subpart Y Emissions Information for Process Units Monitored by CEMS
• #Subpart Y Validation Report

The end of the page contains links you can use for more information on these topics.

Subpart Y Summary Information for this Facility

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Subpart Y requires you to report the following data about your facility:

• The annual CO₂ emissions from sour gas sent off-site for sulfur recovery
• The annual CH₄ emissions from the following sources:
  • Uncontrolled Blowdown Systems
  • Equipment Leaks
  • Loading Operations
  • Storage Tanks
  • Delayed Coking

Subpart Y Delayed Coking Unit Information

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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
• Method used to calculate the CH₄ emissions

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

• A unique name or identifier, plus optional description. See also About Unique Unit Names
• Typical drum outage in feet (i.e. unfilled distance from the top of the drum)

Subpart Y Asphalt Blowing Unit Information

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Subpart Y Coke Calcining Unit Information

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Subpart Y Catalytic Cracking, Fluid Coking, and Catalytic Reforming Unit Information

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Subpart Y collects the following data about your Catalytic Cracking, Fluid Coking, or Catalytic Reforming unit:

• A unique name or identifier, plus optional description for this unit (see also About Unique Unit Names)
• Specify the type of unit:
  • Fluid Catalytic Cracking Unit
  • Thermal Catalytic Cracking Unit
  • Traditional Fluid Coking Unit
  • Catalytic Reforming Unit
  • Fluid Coking Unit with Flexicoking Design (see note below)
• An indication whether each unit is monitored by a CEMS

For Catalytic Cracking or Coking units that are NOT monitored by CEMS, Subpart Y also collects the following data:

• Maximum rated throughput of the unit (bbl per stream day)
• Method used to calculate CO₂ emissions (only appears if you select No for using a CEMS):
  • 98.253(c)(2) - Equation Y-6 and continuous monitor for flow (but not meeting the CEMS monitoring requirements of 98.253(c)(1); e.g., not meeting the full CEMS quality assurance requirements)
  • 98.253(c)(2) - Equation Y-6 and Y-7a
  • 98.253(c)(2) - Equation Y-6 and Y-7b
  • 98.253(c)(3) - Equation Y-8 (option appears only for Catalytic Cracking or Coking units; available only for catalytic cracking units and fluid coking units with rated capacities of 10,000 barrels per stream day (bbls/sd) or less that do not use a continuous CO₂ CEMS for the final exhaust stack)
  • 98.253(e)(3) - Equation Y-11 (option appears only for Catalytic Reforming units)
• Method used to calculate CH₄ emissions:
  • Equation Y-9
  • Unit-specific measurement data
  • A unit-specific emission factor based on a source test of the unit
• Method used to calculate N₂O emissions:
  • Equation Y-10
  • Unit-specific measurement data
  • A unit-specific emission factor based on a source test of the unit

For Catalytic Cracking or Coking units that are monitored by CEMS, Subpart Y also collects the following data:

• Maximum rated throughput of the unit (bbl per stream day)
• Method used to calculate CH₄ emissions:
  • Equation Y-9
  • Unit-specific measurement data
  • A unit-specific emission factor based on a source test of the unit
• Method used to calculate N₂O emissions:
  • Equation Y-10
  • Unit-specific measurement data
  • A unit-specific emission factor based on a source test of the unit

Subpart Y Flares Unit Information

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Subpart Y Process Vents Unit Information

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Subpart Y collects the following data about your Process Vent unit:

• A unique name or identifier, plus optional description for this process vent unit (see also About Unique Unit Names):
• Operation type associated with this process vent:
• Control device used to reduce methane (and other organic) emissions from the unit:
• Annual volumetric flow discharged to the atmosphere (scf)
• Method used to measure or estimate the annual volumetric flow rate:
• Number of venting events, if vent is intermittent
• Cumulative venting time (hours)
• Greenhouse gases to report for this process vent. Select any combination of CO₂, CH₄ or N₂O. CO₂ emissions must be reported if the process vent contains greater than 2 percent by volume CO₂ or greater. CH₄ emissions must be reported if the process vent contains 0.5 percent by volume of CH₄ or greater. N₂O emissions must be reported if the process vent contains 0.01 percent by volume of N₂O or greater.

Subpart Y collects the following data if CO₂ is being reported for this Process Vent:

• Annual CO₂ emissions from this process vent (metric tons).
• Annual average mole fraction of CO₂
• Method used to measure or estimate the annual average mole fraction of CO₂:

Subpart Y collects the following data if CH₄ is being reported for this Process Vent:

• Annual CH₄ emissions from this process vent (metric tons).
• Annual average mole fraction of CH₄
• Method used to measure or estimate the annual average mole fraction of CH₄:

Subpart Y collects the following data if N₂O is being reported for this Process Vent:

• Annual N₂O emissions from this process vent (metric tons).
• Annual average mole fraction of N₂O
• Method used to measure or estimate the annual average mole fraction of N₂O:

Subpart Y Sulfur Recovery Plant Information

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Subpart Y Emissions Information for Process Units Monitored by CEMS

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For each CEMS Monitoring Location, provide the following information:

• A unique unit name or identifier for the CML (see also About Unique Unit Names)
• An optional description or label for the CML
• The configuration of processes or process units that are monitored by the CML:
  • Single industrial process or process unit that exhausts to a dedicated stack
  • Multiple industrial processes or process units share a common stack
  • Industrial process or process unit shares a common stack with one or more stationary fuel combustion units
• The name of each fuel combusted in the unit(s) monitored by the CEMS
• The Tier 4/CEMS methodology start and end dates
• The cumulative total of hourly CO₂ mass emissions for each quarter of the reporting year (in metric tons) (Do not cumulate emissions data between quarters)
• The total annual CO₂ mass emissions measured by the CEMS (in metric tons)
• An indication whether emissions reported for the CEMS include emissions calculated according to 98.33(a)(4)(viii) for a slipstream that bypassed the CEMS
• The total annual biogenic CO₂ emissions from the combustion of all biomass fuels combined (in metric tons) (if applicable)
• The total annual non-biogenic CO₂ emissions (includes fossil fuel, sorbent, and process CO₂ emissions, in metric tons)
• The total annual CH₄ and N₂O emissions associated with the combustion of all Table C-2 fuels combusted in all processes/process units monitored by the CEMS derived from application of Equation C-10 (in metric tons) (if there are no combustion emissions in this CML, please enter zero)
• The total number of source operating hours in the reporting year
• The total operating hours in which a substitute data value was used in the emissions calculations for the CO₂ concentration parameter
• The total operating hours in which a substitute data value was used in the emissions calculations for the stack gas flow rate parameter
• If moisture correction is required and a continuous moisture monitor is used, the total operating hours in which a substitute data value was used in the emissions calculations for the stack gas moisture content parameter
• An indication of the process units monitored by the CML
• The CO₂ emissions from this CEMS Monitoring Location that are attributable to process CO₂ emissions from this process unit (metric tons).

Subpart Y Validation Report

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#Back to Top

See Also

Screen Errors
Using Cal e-GGRT to Prepare Your Subpart Y Report
Subpart Y Summary Information for this Facility
Subpart Y Delayed Coking Unit Information
Subpart Y Asphalt Blowing Unit Information
Subpart Y Coke Calcining Unit Information
Subpart Y Catalytic Cracking, Fluid Coking, and Catalytic Reforming Unit Information
Subpart Y Flares Unit Information
Subpart Y Process Vents Unit Information
Subpart Y Sulfur Recovery Plant Information
Subpart Y Emissions Information for Process Units Monitored by CEMS
Subpart Validation Report