Factors affecting the location of methanometers on mining equipment.
Taylor-CD; Thimons-ED; Zimmer-JA
J Mine Vent Soc S Afr 2003 Jan/Mar; 56(1):25-29
The U.S. Code of Federal Regulations (Title 30) requires that a methane monitor be placed on every mining machine to continuously observe and record methane levels at the face. The monitor must provide a warning whenever methane levels are 1% or higher. An effective monitoring system will indicate a methane concentration of 1% on the mining machine before methane levels at the mining face reach 5%. Where the methane monitor is located on the mining machine is one of the most important factors that determines how effectively face methane levels can be predicted. Any change in the sampling location will result in a change in measured methane concentration. To protect the methanometer, it is usually located on the cutting boon at least 1 to 1.8 m (3 to 6 ft) outby the front cutting bits. A face ventilation system using blowing tubing was simulated in a full-scale test facility. Methane released from the face area was monitored at multiple locations on a model mining machine, as well as at locations near the face. Based on the relationship between concentrations measured on the machine and at the face, criteria were developed for selecting the best machine locations for monitoring methane. Recommendations are given for revising methane action levels for alternative sampling locations.
Methanes; Mining-equipment; Underground-mining; Methane-sampling; Ventilation; Monitoring-systems; Ventilation-systems
NIOSH, Pittsburgh Research Laboratory, P.O. Box 18070, Pittsburgh, PA 15236
Research Tools and Approaches: Control Technology and Personal Protective Equipment
Journal of the Mine Ventilation Society of South Africa