The processing, production equipment, main technical points and dosage design of double wall corrugated PVC pipe are introduced, and the results of faults and its solutions in production are analyzed.
介绍了生产聚氯乙烯（ PVC）双壁波纹管的工艺流程、生产设备、工艺控制要点及配方设计，分析了生产中出现故障的原因，并提出解决措施。
And then, it is discussed that there are not only one symmetric solutions in the sudden-expansion flows of open channel and round pipe.
同时，讨论了明渠突扩流动和圆管突扩流动中存在的不止一个对称解问题，并就此问题未被重视的原因进行了初步分析。
Some problems, such as serious pipe corrosion and unstable acid-base property, and the solutions are presented.
提出目前存在着管线腐蚀严重、水的酸碱性不稳定等问题及解决的方法。
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