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首页> 外文期刊>Urban water journal >Addressing corrosion control and valve tuberculation in a water distribution system supplied by a silica-laden groundwater
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Addressing corrosion control and valve tuberculation in a water distribution system supplied by a silica-laden groundwater

机译：解决由含二氧化硅的地下水提供的供水系统中的腐蚀控制和阀门结核

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Metal corrosion and valve tuberculation within a water distribution system supplied by groundwater containing 52mg/L silica were studied using a corrosion test rack installed within a residence to determine the effectiveness of phosphate-based (PB) and silica-based (SB) corrosion inhibitor (CI). Results indicated that internal corrosion control based on the use of phosphate-based or silica-based CIs did not significantly decrease iron, lead, or copper corrosion rates, and in one case, caused a negative impact on copper corrosion rate. Evaluations of metal coupons using scanning electron microscopy, electron dispersive X-ray analysis, and X-ray photoelectron spectrophotometry confirmed these findings. Since CI failed to reduce corrosion rates, valve tuberculation within the water system could not be controlled. Consequently, a valve replacement plan was developed in place of an internal corrosion control method using CIs. An opinion of probable replacement cost for 200 tuberculated valves approximated $3.3 million expended over 20years.
机译：使用住宅内安装的腐蚀测试架研究了由含52mg / L二氧化硅的地下水提供的供水系统中的金属腐蚀和阀门结垢，以确定磷酸盐基（PB）和二氧化硅基（SB）缓蚀剂的有效性（ CI）。结果表明，基于使用磷酸盐基或二氧化硅基CI的内部腐蚀控制不会显着降低铁，铅或铜的腐蚀速率，并且在一种情况下，对铜的腐蚀速率产生负面影响。使用扫描电子显微镜，电子弥散X射线分析和X射线光电子分光光度法对金属试样的评估证实了这些发现。由于CI无法降低腐蚀速率，因此无法控制供水系统内的阀门结核。因此，制定了阀门更换计划，以代替使用CI的内部腐蚀控制方法。对于200个管状阀门的可能更换成本的意见大约在20年内花费了330万美元。

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