Page 334 - Advanced Mine Ventilation
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Gas Transport in Underground Coal Mines 311
Figure 18.1 Underground methane pipe installation.
Figure 18.2 Venthole surface installation.
connection will be used every 10 joints (approximately 210 ft apart) so that a section of
the pipeline can be removed without cutting the line if one or more joints need to be
replaced later.
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b. All underground plastic line will be 3 to 6 HDPE pipes. Plastic flange adapters will be
fusion bonded to the pipe ends in fresh air. Steel flanges back up rings installed prior to
fusion bonding will be used to connect plastic to plastic and plastic to steel.
