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Related Experiment Videos

A generic mixing system for achieving conditions suitable for single point representative effluent air sampling

A R McFarland1, N K Anand, C A Ortiz

  • 1Department of Mechanical Engineering, Texas A&M University, College Station, 77841, USA.

Health Physics
|January 12, 1999
PubMed
Summary

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The U.S. Environmental Protection Agency (EPA) approved new methods for sampling radionuclide aerosol particles. A developed mixing system ensures accurate single-point sampling in U.S. Department of Energy (DOE) facilities.

Area of Science:

  • Environmental Science
  • Chemical Engineering
  • Industrial Hygiene

Background:

  • Radionuclide aerosol particle sampling is critical for U.S. Department of Energy (DOE) facilities.
  • Existing methods often require specific flow conditions for accurate sampling.
  • U.S. Environmental Protection Agency (EPA) approval is necessary for alternate methodologies.

Purpose of the Study:

  • To present EPA-approved Alternate Reference Methodologies for radionuclide aerosol particle sampling.
  • To introduce a generic mixing system for stacks and ducts lacking adequate flow mixing.
  • To validate the effectiveness of the mixing system for single-point sampling.

Main Methods:

  • Utilized single-point sampling with shrouded probes in well-mixed flow cross-sections.

Related Experiment Videos

  • Developed and implemented a generic mixing system for non-ideal stack and duct configurations.
  • Measured coefficients of variation for velocity, tracer gas, and aerosol particle profiles.

    • Main Results:

    • Achieved coefficients of variation below 10% for velocity, tracer gas, and 10 micrometer aerodynamic diameter aerosol particles.
    • Demonstrated that the mixing system's effectiveness is independent of system size and flow rate in turbulent flow.
    • Confirmed results are well within the EPA's acceptable limit of 20% variation.

    Conclusions:

    • The developed mixing system effectively creates conditions suitable for single-point sampling.
    • Alternate Reference Methodologies, including the mixing system, are validated for radionuclide aerosol particle sampling.
    • These advancements support regulatory compliance and enhance safety at DOE facilities.