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Mining Publication: Methane and Dust Controls for Longwalls: Pocahontas No. 3 Coalbed, Grundy, Va.
Keywords: Degasification Respirable dust Water infusion
Original creation date: January 1974
Authors: A Cetinbas, RP Vinson, J Cervik, MG Zabetakis
Report of Investigations - January 1974
Download PDF Document (1.10 MB)
NIOSHTIC2 Number: 10000712
Pittsburgh, PA: U.S. Department of the Interior, Bureau of Mines, NTIS No. PB-231110, RI 7849, 1974 Jan; :1-16,
The periphery of longwall panels in the Pocahontas No. 3 Coalbed is characterized by a zone of reduced permeability that inhibits the natural drainage of methane. A residual gas pressure of 105 psig was measured after 1 year in an isolated block of coal measuring 340 by 1,100 feet. The buildup of gas pressure within such large blocks causes methane problems during plowing operations. However, natural drainage holes drilled during development have been found to reduce the gas content of the coal in this coalbed by over 90 percent. The effect of water infusion on dust during plowing operations was investigated using existing methane drainage holes. These holes were cleaned of debris and a pipe was grouted into the hole for water infusion of the panel. Both total and respirable dust levels were reduced by 40 to 79 percent. Water infusion of the panel proved more effective than did the use of a plow-mounted spray system.
Image of publication Methane and Dust Controls for Longwalls: Pocahontas No. 3 Coalbed, Grundy, Va.Report of Investigations - January 1974
Download PDF Document (1.10 MB)
NIOSHTIC2 Number: 10000712
Pittsburgh, PA: U.S. Department of the Interior, Bureau of Mines, NTIS No. PB-231110, RI 7849, 1974 Jan; :1-16,
See Also
Degasification and Production of Natural Gas From an Air Shaft in the Pittsburgh Coalbed
Degasification System Selection for U.S. Longwall Mines Using an Expert Classification System
Directionally Controlled Drilling To Horizontally Intercept Selected Strata, Upper Freeport Coalbed, Greene County, Pa.
Drainage of Methane From the Overlying Pocahontas No. 4 Coalbed From Workings in the Pocahontas No. 3 Coalbed
Dust Considerations When Using Belt Entry Air to Ventilate Work Areas
Rotary Drilling Techniques Used in the Beckley Coalbed
Technology News 463 - Machine-Mounted Continuous Respirable Dust Monitor
Technology News 509 - A New Method to Clean Dust From Soiled Work Clothes
Use of Vertical Boreholes for Assisting Ventilation of Longwall Gob Areas
Water Infusion - An Effective and Economical Longwall Dust Control
Page last reviewed: September 21, 2012
Page last updated: September 21, 2012
Content source: National Institute for Occupational Safety and Health, Mining Program
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