Sentence examples for roof gas from inspiring English sources
PFG curve of degree of roof gas emissions; FGK curve of degree of bottom gas emissions.
For these reasons, a Y-type ventilation and gas drainage system from the roof roadway is used, as shown in Figs. 3 and 4. Open image in new window Fig. 3 Three-dimensional drawing showing different methods of gas drainage Open image in new window Fig. 4 Design of Y-type roof gas drainage boreholes.
It curbs the occurrence of roof, gas, and fire accidents, safeguard coal mine practitioners' personal safety, improves underground mine working environment, ensures coal mine safety, efficient, integrated production, improves the efficiency of coal mining and energy supply, and provides reliable energy security for China's sustained, healthy and stable economic development.
Extensive studies have been undertaken to characterize the roof gas-enrichment zone in the Huainan mining area.
Isolation of a part of a mine could be due to fire, a roof collapse, gas outburst, gas explosion or any kind of emergency.
At the Dakota, you will still have to empty your pockets to get past the co-op board, but for the trouble and for prices that are, on a square footage basis, roughly comparable to those at 15 Central Park West, you can acquire a rarely available apartment in a celebrated building with high gables and deep roofs, gas-lighted entryway and aura of power and mystery.
The zone in the roof becomes gas enriched.
Figuring out the mining-crack-evolution characteristics of overburden strata is very important to roof control, gas drainage, disaster prevention and high efficient mining.
Additionally, boreholes beneath the current coal seam can also be drilled in the upper tailgate which avoids the additional drilling work such as arranging buried pipes in the gob area of the working coal seam or striking boreholes along the roof for gas drainage.
The heating and cooling systems, located on the roof, are gas-powered rather than electric, which reduces energy losses associated with electrical power transmission.
Third, large-diameter horizontal boreholes could be drilled from the roadway to the gas-enrichment zone above the gob roof to drain gas from the gob area and control gas in the upper corner of the working face.
