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城市供水管道频繁爆管、漏水,不仅造成水资源的浪费,影响工矿企业正常生产和居民日常生活,而且威胁着供水管网的安全运行,增加供水企业的运行成本。通过统计广西绿城水务股份有限公司近三年来的供水管道修漏资料,对城市供水管道漏损原因作简要分析,探讨供水管道爆管的成因,并在给水管材的选择、管道工程的设计和施工、调度和运行管理等方面提出对策。 相似文献
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水是生命存在之根本,水的供应是否满足人们的需求,关系重大。在水的供应中,供水管道的长度,体现了一个城市的发展水平。本文立足时间序列模型的特点,利用改革开放30年来都市供水管道长度变化数据,建立了GARCH模型,并对都市未来供水管道的长度进行预测分析。 相似文献
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针对大多数城乡供水工程建设和管理人员缺乏PVC-U管道施工和维护基础知识的现状,结合多年供水工程建设经验及有关技术规范,将城乡供水工程中的PVC-U供水管道的安装与维修方法进行了总结提炼,供广大城乡供水工程建设和管理人员参考. 相似文献
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从近几年兴建的大型供水工程来看 ,所用管材多为钢管、预应力钢筋混凝土管 ,这两种管材的生产、质量性能和使用安全度等方面 ,都还存在一些问题 ,而且由于预应力钢筋混凝土管在运行中出现爆管、渗漏等引起使用和管理部门的担心 ,影响推广使用。因此 ,在一些重大而紧迫的工程中多采用钢管作为输水管道。但钢管的防腐处理较麻烦 ,长距离的管道防腐质量难以得到保证 ,就此结合实际工程选用 FRP管进行必要的调研和论证 相似文献
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Pipe breaks often occur in water distribution networks and result in large water loss and social-economic damage. To reduce the water loss and maintain the conveyance capability of a pipe network, pipes that experienced a severe break history are often necessary to be replaced. However, when to replace a pipe is a difficult problem to the management of water distribution system. This study took part of the water distribution network of Beijing as a case and collected the pipe properties and the pipe breaks data in recent years (2008–2011). A prediction model of pipe beak rate was first developed using genetic programming. Then, an economically optimal pipe replacement model was set up. Finally, the optimal pipe replacement time was determined by the model. The results could help the utility managers to make cost-effective pipe maintenance plans. 相似文献
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Modeling of Water Main Failure Rates Using the Log-linear ROCOF and the Power Law Process 总被引:1,自引:1,他引:0
This paper presents applications of the log-linear ROCOF and the power law process to model the failure rate and estimate
the economically optimal replacement time of the individual pipes in a water distribution system. The performance of the two
failure rate models is examined using the maximized log-likelihoods for different modeling approaches in which the method
of observing failures differs. The optimal replacement time equations for the two models are developed by applying the methodology
of Loganathan et al. (J Water Resour Plan Manage ASCE 128(4):271–279, 2002) for the case in which modified time scales are
used. It was found that the log-linear ROCOF showed better performance than the power law process when the ‘failure-time-based’
method is used. Furthermore, the ‘failure-time-based’ method is proved to be superior compared to the ‘failure-number-based’
method for the water mains under study, implying that recording each failure time results in better modeling of the failure
rate than observing failure numbers in some time intervals. 相似文献
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用水量预测研究和给水管网数学模型研究是优化调度的基础,用水鼍预测模型是在分析城市用水量序列数据模式的基础上,综合利用统计回归的方法建立的数学表达式;给水管网数学模型是建立水厂出厂压力和流量与管网测压点之间的经验数学表达式,它反映了给水系统的运行工况.优化调度模型的建立和求解是优化调度的核心. 相似文献
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上海市自来水市北有限公司根据管网管理需要建立管段数约20万的大型管网模型系统.系统介绍了建立模型所需数据的收集与整理,以及模型建立工程.模型经过校核和调试,目前已在管网规划、现状评估、预案模拟等多项工作中得到应用.以市北闸北水厂停役为例具体讲述了模型的应用. 相似文献