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Dynamics of material detachment from drinking water pipes under flushing conditions in a full-scale drinking water laboratory system

机译：全规模饮用水实验室系统冲洗条件下饮用水管道材料脱离的动态

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Discoloration is currently the major cause of consumer complaints worldwide, being mainly caused by the accumulation and mobilization of materials in the inner pipe walls of drinking water distribution systems. The understanding about material detachment from pipe walls is limited due to its complexity and lack of data. The purpose of this study was to examine the initial stages of material detachment from PVC pipe walls during flushing operations using a full-scale laboratory system. Experiments consisted of a material accumulation phase with periods from 40 to 120 days, followed by a material mobilization phase with wall shear stresses above 5 Pa. Results indicated that material detachment mainly occurs during the periods of velocity increase, at rates ranging from 0.5 to 14 mNTU/s. In addition, a second stage of material detachment was observed during steady flow conditions, and a fast detachment event highlighted impacts of curved sections on the mobilization phenomena.
机译：褪色目前是全世界消费者投诉的主要原因，主要是由饮用水分配系统内管壁的积累和动员引起的。由于其复杂性和数据缺乏，对管壁的材料脱离的理解受到限制。本研究的目的是在使用全尺度实验室系统期间从PVC管壁中检查来自PVC管壁的材料分离的初始阶段。实验由具有40至120天的时间的物质累积阶段组成，其次是具有高于5Pa的壁剪切应力的材料剧阶段。结果表明，材料脱离主要发生在速度增加期间，以0.5至14的速度。 mntu / s。此外，在稳定的流动条件下观察到第二阶段的材料脱离，并且快速脱离事件突出显示弯曲部分对动员现象的影响。

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