Navigating Refining Regulations: 40 CFR Part 63 Subpart CC

Learn more about National Emission Standards for Hazardous Air Pollutants from Petroleum Refineries specifically on 40 CFR Part 63 Subpart CC. This blog post outlines the steps to comply with Subpart CC and how ESC Spectrum can equip your facility to streamline emission monitoring needs.
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National Emission Standards for Hazardous Air Pollutants From Petroleum Refineries

Petroleum refineries are essential to producing gasoline, diesel, and other vital products that keep our world running. However, they also emit hazardous air pollutants (HAPs) that pose significant risks to human health and the environment.


To mitigate these risks, the Environmental Protection Agency (EPA) established Title 40 Chapter I Subchapter C Part 63 Subpart CC, which sets the National Emission Standards for Hazardous Air Pollutants (NESHAP) From Petroleum Refineries.

What is Subpart CC?

Subpart CC is a section of the NESHAP regulations specifically tailored to petroleum refineries. It aims to reduce emissions of hazardous air pollutants through stringent control technologies and operational practices. The hazardous air pollutants targeted by Subpart CC include substances like benzene, toluene, and xylene.


Key Elements of Subpart CC

  • Emission Limits: The subpart sets specific limits on the amount of hazardous pollutants that can be emitted from various refinery processes and equipment. 


  • Control Technologies: Refineries are required to implement the best available control technologies (BACT) to capture and reduce emissions. This includes equipment like absorbers, carbon adsorbers, condensers, incinerators, flares, boilers, and process heaters.


  • Operational Standards: In addition to equipment requirements, Subpart CC mandates certain operational practices. For example, refineries must regularly inspect and maintain equipment to ensure it operates efficiently and with minimal emissions.


  • Monitoring and Reporting: Continuous monitoring of emissions is crucial. Refineries must use approved methods to measure emissions and report to the EPA. This ensures compliance and helps the agency track pollution levels.

Need tips to keep your CEMS equipment running smoothly? Read 5 tips to enhance operational standards at your facility.

Understanding Emission Points in Refineries Under Subpart CC

An emission point in a refinery refers to a specific location or source within the facility where pollutants are released into the environment. These pollutants can be gases, particulates, or other substances.


In the context of this regulatory subpart, the term “affected source” encompasses all emission points located at a single refinery plant site. Emission points at refineries that fall under this rule include:


  1. Miscellaneous process vents
  2. Storage vessels
  3. Wastewater streams and treatment operations
  4. Equipment leaks
  5. Gasoline loading racks
  6. Marine vessel loading operations
  7. Equipment at bulk gasoline terminals or breakout stations
  8. Heat exchange systems
  9. Emissions from decoking operations of coking units

Continuous Monitoring of Operating Parameters

  • Data Collection: Measure data at least once per hour.


  • Record Keeping: Record data values or block averages (1-hour or shorter).


  • Automated Systems:
    • Measure and record operating parameters hourly.
    • Record date/time of monitor status and detect unchanging data.
    • Compute daily averages based on recorded data.
  • Daily Averages: Calculate and retain daily averages of monitored parameters.


  • Within Range: If all values are within the established range, a simplified record can be kept instead of daily averages.


  • Exclusions: Exclude data during system breakdowns, repairs, calibration checks, and adjustments from averages.

Whether you require custom-built solutions for natural gas and midstream operations, precise process monitoring, efficient flare gas management, or comprehensive fenceline and ambient air monitoring, we have the technology and expertise to meet your unique needs. Explore our range of solutions today.

How Do Refineries Comply?

Compliance with Subpart CC involves several steps:


  • Installing Control Equipment: Refineries must equip their facilities with technology capable of reducing HAP emissions.


  • Routine Inspections: Regular checks and maintenance ensure that all equipment functions correctly. Learn more about our CEMS Maintenance Program.


  • Recordkeeping: Detailed records of emissions and maintenance activities must be kept and made available for EPA inspections.
    • Keep copies of all applicable reports and records for at least 5 years unless specified otherwise.
    • Records must be readily accessible within 24 hours.
    • Records can be maintained in hard copy or electronic form (e.g., paper, microfilm, computer, flash drive, floppy disk, magnetic tape, or microfiche).


  • Reporting: Refineries need to submit periodic reports to the EPA, detailing their emissions and any deviations from standards. Our Reporting team is on standby to help your facility meet compliance in its reporting to the EPA. 


    Learn more about our Reporting Services today. 

To review Subpart CC in its entirety, visit here.

How ESC Spectrum Can Help in Refining Plants

Facilities across the U.S. rely on StackVision and Prism, our industry-leading data acquisition system software, for accurate and reliable air emissions monitoring and reporting to meet federal, state, and local requirements.


Our family of 8864 Data Controllers provides a reliable and powerful hardware bridge between StackVision and Prism. They excel at collecting, monitoring, conducting Quality Assurance, and reporting on emissions data from continuous monitoring systems with pinpoint accuracy.

Picture of Taylor Hempel - Marketing Specialist II

Taylor Hempel - Marketing Specialist II

Taylor Hempel is a skilled marketer specializing in content creation, social media management, and driving customer engagement. With a BBA in Marketing from the University of Texas at San Antonio, she joined ESC Spectrum in February 2022. Taylor is adept at crafting informative content about continuous emissions monitoring systems, its components and data acquisition systems allowing her to craft content that educates and informs industry professionals.

Contact Taylor at for questions or comments.

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