Based on analysis of problems in old oxygen making machine, necessary measures for local transformation are adopted and expected effect is achieved.

分析了老制氧机存在的问题，有针对性地采取了必要的局部改造措施，达到了预期目的。

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Since running, the system runs steadily, its control precision is higher and the quality of steel tube is satisfactory. The expected effect is achieved.

投运以来，系统运行稳定可靠，控制精度高，钢管质量好，取得了预期效果。

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Since running, the system runs steadily, its control precision is higher and the quality of steel tube is satisfactory. The expected effect is achieved.

投运以来，系统运行稳定可靠，控制精度高，钢管质量好，取得了预期效果。

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