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一、前言我厂生产石棉水泥输水管、煤气管、井管已有近三十年历史,多年生产能力仅为110～160公里,是设计能力的18.4～26.7%,远未发挥制管机生产能力,其规格为φ100×4000～φ500×4000mm。管材广泛应用于输水、输
I. INTRODUCTION Our factory has been manufacturing asbestos cement water pipes, gas pipes, and well pipes for nearly 30 years. The annual production capacity is only 110 to 160 kilometers, which is 18.4 to 26.7% of the design capacity. It is far from the production of pipe making machines. Capacity, its specification is φ100×4000～φ500×4000mm. Pipes are widely used in water transportation and transportation