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Sunday, August 2, 2020 | History

2 edition of Methane control on longwalls with cross-measure boreholes (Lower Kittanning Coalbed) found in the catalog.

Methane control on longwalls with cross-measure boreholes (Lower Kittanning Coalbed)

F. Garcia

Methane control on longwalls with cross-measure boreholes (Lower Kittanning Coalbed)

by F. Garcia

  • 299 Want to read
  • 3 Currently reading

Published by U.S. Dept. of the Interior, Bureau of Mines in Pittsburgh, Pa. (P.O. Box 18070, Pittsburgh 15236) .
Written in English

    Places:
  • Pennsylvania,
  • Cambria County.,
  • Cambria County
    • Subjects:
    • Coalbed methane drainage -- Pennsylvania -- Cambria County.,
    • Longwall mining -- Pennsylvania -- Cambria County -- Safety measures.,
    • Boring.

    • Edition Notes

      Bibliography: p. 17.

      Statementby F. Garcia and J. Cervik.
      SeriesReport of investigations ;, 8985, Report of investigations (United States. Bureau of Mines) ;, 8985.
      ContributionsCervik, Joseph.
      Classifications
      LC ClassificationsTN23 .U43 no. 8985, TN305 .U43 no. 8985
      The Physical Object
      Pagination17 p. :
      Number of Pages17
      ID Numbers
      Open LibraryOL2663106M
      LC Control Number85600126

      Underground gas drainage (based on European methods) as an alternative means of methane control are being developed. Cross-measure boreholes are drilled into the roof over the panel and on. top methane drainage entry upper wall boreholes: lenght: m GHYLDWLRQ VORSH lower wall boreholes: lenght: m GHYLDWLRQ VORS KEY: intake air return air methane drainage pipeline cross-measure borehole regulator mine seal A A head entry tail entry L O N G W A L L L s=( - ) L g h > 5g but min. 12m min.

      "The cross-measure borehole technique has been shown by the Bureau of Mines to be an effective method of controlling methane liberated by fracturing the roof strata in longwall gobs where overburden is less than ft ( m). Boreholes are drilled Cited by: 6. ri / methane control on longwalls with cross-measure boreholes (lower kittanning coalbed), pb, $ 15 ri / reducing hazards in underground coal mines through the recognition and delineation of coalbed discontinuities caused by ancient channel processes, pb, $

      "The cross-measure borehole technique has been shown by the Bureau of Mines to be an effective method of controlling methane liberated by fracturing the roof strata in longwall gobs where overburden is less than ft ( m). Boreholes are drilled Cited by: 1. Methane Control on Longwalls with Cross-Measure Boreholes (Lower Kittanning Coalbed) 1/1/ - Reports of Investigations The cross-measure borehole technique is an effective method of controlling methane liberated by fracturing the roof strata in longwall gobs where overburden is .


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Methane control on longwalls with cross-measure boreholes (Lower Kittanning Coalbed) by F. Garcia Download PDF EPUB FB2

The cross-measure borehole technique has been shown by the Bureau of Mines to be an effective method of controlling methane liberated by fracturing the roof strata in longwall gobs where overburden is less than ft ( m). The captured methane is thus prevented from entering the ventilation system of the mine.

About 71 pct of the methane produced by longwall mining in the Lower Kittanning coalbed was captured by the cross-measure boreholes. Borehole spacing is an important factor. Centers for Disease Control and Prevention.

CDC twenty four seven. NIOSHTIC-2 Publications Search. Methane Control on Longwalls With Cross-measure Boreholes. Authors Garcia-F Source Gri Quart Rov Methane from Coal Seams Tech 5(1) Methane control on longwalls with cross-measure boreholes (Lower Kittanning Coalbed) 17 p. (OCoLC) Online version: Garcia, F.

(Fred). Methane control on longwalls with cross-measure boreholes (Lower Kittanning Coalbed). Pittsburgh, Pa. (P.O. BoxPittsburgh ): U.S. Dept. of the Interior, Bureau of Mines, [] (OCoLC) Additional Physical Format: Garcia, F.

(Fred). Methane control on longwalls with cross-measure boreholes (Lower Kittanning Coalbed) 17 p. (OCoLC)   Guidelines for the Prediction and Control of Methane Emissions on Longwalls [Schatzel, Dr.

Steven J., Karacan, Dr. Ozgen, Krog, Robert B., Esterhuizen, Dr. Gabriel S., Goodman, Dr. Gerrit V.R., Centers for Disease Control and Prevention, Department of Health and Human Services, National Institute of Occupational Safety and Health] on Amazon Cited by: 5.

The captured methane is thus prevented from entering the mine's ventilation system. About 71 pct of the methane produced by longwall mining in the Lower Kittanning Coalbed was captured by the cross-measure boreholes.

Borehole spacing is an important factor. Methane control on longwalls with cross-measure boreholes (Lower Kittanning Coalbed) /Author: F.#N# (Fred) Garcia and Joseph. Cervik.

The captured methane is thus prevented from entering the mine's ventilation system. About 71 pct of the methane produced by longwall mining in the Lower Kittaning coalbed was captured by the cross-measure boreholes. Borehole spacing is an important factor affecting the performance of.

Methane drainage with cross-measure boreholes. Boreholes 2–4 in. in diameter are drilled from the tailgate to a depth of – ft in the floor. The inclination of these boreholes varies from 20 to 50 degrees, and the axis of the boreholes is inclined to the longwall axis at 15–30 degrees.

Journal Article: Methane drainage with cross-measure boreholes on a retreat longwall face Title: Methane drainage with cross-measure boreholes on a retreat longwall face Full Record. In addition, the cross-measure boreholes on panel B were drilled parallel to the face, whereas those on panel A were drilled at a 45 degrees angle with respect to the longwall axis.

The studies show that the cross-measure system captured 71 pct of the methane generated by longwall mining on panel A. Methane drainage using underground cross-measure boreholes. Methane drainage using underground cross-measure boreholes was the major outburst control method used before in the Luling mine.

The number of boreholes drilled was very large and much time was spent solving gas “kicks.” On average, only one borehole could be finished per Cited by: Control of methane hazard depends also on other co-occuring natural dangers for which used preventive actions eliminate methane hazard.

dependent on mining and ventilation systems of longwalls. Guidelines for the Prediction and Control of Methane Emissions on Longwalls Details Compiled by the U.S.

Dept of Health and Human Services, CDC/NIOSH Office of Mine Safety and Health Research, these guidelines are recommended for controlling longwall coalbed methane.

When analyzing the results presented in table it must be observed that in case of most longwalls there is a high correlation between ventilation air methane emission, absolute methane-bearing.

Methane emission with depth Methane emissions from the extraction increase (1ft=0,m, 1 MMscf=28,32 m3) In exploitation was performed by means of Selection of horizontal boreholes, cross-measure boreholes, vertical boreholes, or gob gas vent holes is somewhat dependent on the gassiness of the coal seam and the fractured rock strata.

The number of boreholes, their locations, and their degasification durations can be Author: Satar Mahdevari. Methane control on longwalls with cross-measure boreholes (Lower Kittanning Coalbed) / (Pittsburgh, Pa. (P.O. BoxPittsburgh ): U.S. Dept.

of the Interior, Bureau of Mines, []), by F. Garcia and Joseph Cervik (page images at HathiTrust) Shield mechanics and resultant load vector studies /. "The cross-measure borehole technique has been shown by the Bureau of Mines to be an effective method of controlling methane liberated by fracturing the roof strata in longwall gobs where overburden is less than ft ( m).

Boreholes are drilled into roof strata before mining operations affect the roof by: 6. methane in polish coal mines - methods of control and utilisati on N. Szlązak 1, D. Obracaj 1, *M. Boro wski 1, J. Swolkień 1, M. Korzec 1 1 AGH UNIVERSITY OF SCIENCE AND T ECHNOLOGY."The cross-measure borehole technique has been shown by the Bureau of Mines to be an effective method of controlling methane liberated by fracturing the roof strata in longwall gobs where overburden is less than ft ( m).

Boreholes are drilled Cited by: Prediction of longwall methane emissions an evaluation of the influence of mining practices on gas emissions and methane control systems / Guidelines for the prediction and control of methane emissions on longwalls Published: Methane control on longwalls with cross-measure boreholes (Lower Kittanning coalbed).