Design and operation features of gas drainage pipelines made of different materials

The regulatory document [21] says that gas drainage pipelines can be made of steel pipes with walls not less than 2.5 mm thick, or of pipes made of other materials adopted for the application in underground mines. Recently, glass fiber reinforced plastic pipes feature increasingly more frequent use as they have better technical characteristics than steel. The operation of gas drainage pipelines, subject to varying content and rate of wet methane–air mixture flow from drainage boreholes to ground surface, calls for specific care. The varying characteristics are the pressure, volume and methane content of the methane–air mixture in the pipeline. These factors influence the whole gas drainage process efficiency and the variable parameters of the methane–air mixture fed to ground surface. The growing depression in the underground gas pipeline results in the higher air inleakage from mine air, which adversely affects the gas mixture as the methane content decreases in it. The beneficial use of mine methane needs that methane content in the gas–air mixture is stable, which needs obligatory adjustment of the mixture flow regimes. An emphasis should be laid on the underground gas drainage system made of GFRP pipes only.

Malashkina V. A. Design and operation features of gas drainage pipelines made of different materials. MIAB. Mining Inf. Anal. Bull. 2022;(11):173-181. [In Russ]. DOI: 10.25018/0236_1493_2022_11_0_173.

V.A. Malashkina, Dr. Sci. (Eng.), Professor, National University of Science and Technology «MISiS», 119049, Moscow, Russia, e-mail: promecolodgy@mail.ru, ORCID ID: 0000-0001-9270-4790.

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