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为满足我矿100万t／a精矿生产能力，原建设了两条材质为A3钢377X10的卷焊钢管作为精矿输送管道，全长221645m。根据地形条件，全部采用自流管道，坡度按B·C克诺罗兹公式计算为13％，按现场实际情况设计为11．00％～15．09％。我矿自1976年投产以来，因坡度大，流速高．介质对
To meet the mine 1 million t / a concentrate production capacity, the original construction of the two materials for the A3 steel 377X10 volume welded pipe as a concentrate delivery pipe, a total length of 221645m. According to the topographic conditions, all the gravity pipelines are used. The slope is calculated according to the B · C Knorrodz formula as 13% and according to the actual situation of the site as 11.00% ~ 15.09%. Since mine was put into operation in 1976, it has a large slope and high flow rate. Media pair