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Updated: Sep 4, 2025
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Normothermic Negative Pressure Ventilation Ex Situ Lung Perfusion: Evaluation of Lung Function and Metabolism
Published on: February 14, 2022
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Face Ventilation on a Bleederless Longwall Panel.
S J Schatzel1, V Gangrade1, J D Addis1
1National Institute for Occupational Safety and Health (NIOSH), 626 Cochrans Mills Rd, Pittsburgh, PA 15236, USA.
Mining, Metallurgy & Exploration
|July 15, 2022
Summary
This ventilation study used tracer gas to track airflow in a western US coal mine. Findings reveal multiple pathways for air exchange between the longwall face and worked-out areas, crucial for mine safety.
Area of Science:
- Mining Engineering
- Environmental Science
- Industrial Hygiene
Background:
- Longwall mining ventilation is critical for worker safety and methane dilution.
- Bleederless ventilation systems require careful design to manage airflow.
- Understanding air movement in worked-out areas is essential for effective ventilation.
Purpose of the Study:
- To evaluate air exchange between the longwall face and worked-out areas.
- To document airflow pathways within the longwall mining system.
- To assess the effectiveness of current ventilation strategies.
Main Methods:
- Conducted a tracer gas study using sulfur hexafluoride (SF6) at a western US coal mine.
- Released SF6 on the longwall face and in the gob area.
- Monitored tracer gas movement using underground and surface sites.
Main Results:
- Tracer gas moved through the gob at 0.019 m/s (3.7 fpm).
- Overall tracer gas slug movement averaged 0.0091 m/s (1.8 fpm).
- Identified multiple face airflow pathways from headgate towards tailgate.
Conclusions:
- Confirmed the existence of airflow pathways between the longwall face and worked-out areas.
- Demonstrated the utility of tracer gas studies for characterizing mine ventilation.
- Highlighted the importance of detailed air movement analysis for optimizing ventilation design and gas control.
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