论文部分内容阅读
城市供水系统中的管道如果出现事故,由于目前管道修复技术落后,往往造成长时间、大面积停水。不仅损失水量,浪费能源,而且严重影响城市人民的正常生活和工业生产。因此,对给水管道事故进行调研,分析事故原因,有效地采取预防措施,是城市供水亟需研究解决的课题。1 管道中的水锤事故 当阀门或水泵突然开闭时,水流在管道内产生的水锤现象,使得管道中瞬时压力很大,超过正常水压的几倍到几十倍,这样高的水压有可能使管段破裂。 消除水锤常采取的措施有:①在水泵附近供水管道上安装水锤消除器或安全阀,进行泄水减压。②在泵的出水口管道上安装缓闭逆止阀,延长时间,进行缓闭减压。2 管道造成气囊引起的事故 管道施工充水作业时,未排净的
If accidents occur in the pipelines in the urban water supply system, due to the current backwardness in pipeline repair technology, it often causes long-term and large-scale water stoppages. Not only does it lose water, it wastes energy, but it also seriously affects the normal life and industrial production of urban people. Therefore, research on water supply pipeline accidents, analysis of the causes of the accidents, and effective preventive measures are issues that need to be studied and solved by urban water supply. 1 water hammer accident in the pipeline When the valve or the water pump suddenly opens and closes, the water hammer generated by the water flow in the pipeline causes the instantaneous pressure in the pipeline to be very large, which is several times to several dozen times higher than the normal water pressure. Pressure may break the pipe section. Eliminating the water hammer’s usual measures include: 1 Install a water hammer eliminator or safety valve on the water supply pipe near the water pump to perform pressure relief. 2 Install a slow closing check valve on the outlet pipe of the pump to extend the time and perform slow closing and decompression. 2 Accidents caused by airbags caused by air ducts