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九里山矿共安装7台SZ-4型水环式真空泵及压缩机(简称瓦斯机,下同),作抽放瓦斯用。其技术性能见表1。自1982年9月投入运转,每次开一台,轮流运转,到
Jiulishan Mine installed a total of seven SZ-4-type water ring vacuum pumps and compressors (referred to as gas machine, the same below) for the drainage gas used. Its technical performance is shown in Table 1. Since September 1982 put into operation, each opening one, take turns operating to