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Refuge alternatives relief valve testing and design with updated test stand.

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Refuge alternatives relief valve testing and design.

T J Lutz1, P T Bissert1, G T Homce1

  • 1T.J. Lutz, P.T. Bissert, G.T. Homce, member SME, and J.A. Yonkey are mechanical engineer, mechanical engineer, electrical engineer and engineering technician, respectively, at the U.S. National Institute for Occupational Safety and Health (NIOSH), Pittsburgh, PA, USA.

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|December 27, 2016
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Summary

Researchers tested pressure relief valves (PRVs) for mine refuge alternatives (RAs) to ensure safety compliance. Some valves met regulations, while others required modification, highlighting the need for further research on survivability during overpressure events.

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Area of Science:

  • Occupational Safety and Health
  • Mining Engineering
  • Mechanical Engineering

Background:

  • Refuge alternatives (RAs) are crucial for miner safety during emergencies.
  • Pressure relief valves (PRVs) are essential components of RAs, preventing overpressurization.
  • Regulatory bodies like the Mine Safety and Health Administration (MSHA) set standards for PRV performance.

Purpose of the Study:

  • To evaluate the performance of different PRVs against MSHA regulations (30 CFR).
  • To assess the relief pressure and flow characteristics of various valve types.
  • To identify potential improvements for PRV designs in RAs.

Main Methods:

  • Development of an instrumented benchtop test fixture with a centrifugal blower and ductwork.
  • Testing of three distinct PRV units: modified PVC check valve, butterfly check valve, and a commercial RA valve.
  • Evaluation of valve performance under different configurations to ensure compliance with 30 CFR.

Main Results:

  • The commercially available RA valve did not meet the 30 CFR relief pressure specification but might meet the manufacturer's specification.
  • Modified alternative valve designs were adjusted to meet the 30 CFR relief pressure specification.
  • All tested valve designs require further research to assess survivability against a 103 kPa impulse overpressure.

Conclusions:

  • Ensuring PRV compliance with safety regulations is critical for effective mine refuge alternatives.
  • Further research and development are necessary to enhance the robustness of PRVs against extreme overpressure events.
  • Optimizing PRV design is essential for improving miner safety in underground mining environments.