介绍了一种新型适应沉降液气两相波纹管,并对其工作性能进行了测试,试验结果表明:试件满足极限工作条件下的各项性能指标;该管道伸长率达到74.36%,波纹连接管不会发生受拉破坏;波纹管在180°弯曲后表面无裂纹,性能良好;管道在充满1....介绍了一种新型适应沉降液气两相波纹管,并对其工作性能进行了测试,试验结果表明:试件满足极限工作条件下的各项性能指标;该管道伸长率达到74.36%,波纹连接管不会发生受拉破坏;波纹管在180°弯曲后表面无裂纹,性能良好;管道在充满1.5 MPa水压力下发生扭转51°变形,同时施加2.94 k N的压力或者扭转拉伸达到70.42%,管道依然保持较好的工作状态。同时验证了管道在覆土压力和行车荷载作用下,以及大变形位移下均能满足服役要求。基于管道优异的工作性能,对该管道的应用范围进行了扩展和延伸。展开更多
The electrochemical corrosion of ductile pipes(DPs)in drinking water distribution systems(DWDS)has a crucial impact on cement-mortar lining(CML)failure and metal release,potentially leading to drinking water quality d...The electrochemical corrosion of ductile pipes(DPs)in drinking water distribution systems(DWDS)has a crucial impact on cement-mortar lining(CML)failure and metal release,potentially leading to drinking water quality deterioration and posing a risk to public health.An in-situ scanning vibrating electrode technique(SVET)with micron-scale resolution,microscopic scale detection and water quality analysis were used to investigate the corrosion behavior and metal release from DPs throughout the whole CML failure process.Metal pollutants release occurred at three different stages of CML failure process,and there are potential risks of water quality deterioration exceeding the maximum allowable levels set by national standards in the partial failure stage and lining peeling stage.Furthermore,the effects of water chemistry(Cl^(−),SO_(4)^(2−),NO_(3)−,and Ca^(2+))on corrosion scale growth and iron release activity,were investigated during the CML partial failure stage.Results showed that the CML failure process in DPs was accelerated by the autocatalysis of localized corrosion.Cl^(−)was found to damage the uncorroded metal surface,while SO_(4)^(2−)mainly dissolved the corrosion scale surface,increasing iron release.Both the oxidation of NO_(3)−and selective sedimentation of Ca2+were found to enhance the stability of corrosion scales and inhibit iron release.展开更多
文摘介绍了一种新型适应沉降液气两相波纹管,并对其工作性能进行了测试,试验结果表明:试件满足极限工作条件下的各项性能指标;该管道伸长率达到74.36%,波纹连接管不会发生受拉破坏;波纹管在180°弯曲后表面无裂纹,性能良好;管道在充满1.5 MPa水压力下发生扭转51°变形,同时施加2.94 k N的压力或者扭转拉伸达到70.42%,管道依然保持较好的工作状态。同时验证了管道在覆土压力和行车荷载作用下,以及大变形位移下均能满足服役要求。基于管道优异的工作性能,对该管道的应用范围进行了扩展和延伸。
基金supported by the National Natural Science Foundation of China(Nos.51808158,52170101,and 52200116)Tianjin Natural Science Foundation(No.23JCYBJC00640).
文摘The electrochemical corrosion of ductile pipes(DPs)in drinking water distribution systems(DWDS)has a crucial impact on cement-mortar lining(CML)failure and metal release,potentially leading to drinking water quality deterioration and posing a risk to public health.An in-situ scanning vibrating electrode technique(SVET)with micron-scale resolution,microscopic scale detection and water quality analysis were used to investigate the corrosion behavior and metal release from DPs throughout the whole CML failure process.Metal pollutants release occurred at three different stages of CML failure process,and there are potential risks of water quality deterioration exceeding the maximum allowable levels set by national standards in the partial failure stage and lining peeling stage.Furthermore,the effects of water chemistry(Cl^(−),SO_(4)^(2−),NO_(3)−,and Ca^(2+))on corrosion scale growth and iron release activity,were investigated during the CML partial failure stage.Results showed that the CML failure process in DPs was accelerated by the autocatalysis of localized corrosion.Cl^(−)was found to damage the uncorroded metal surface,while SO_(4)^(2−)mainly dissolved the corrosion scale surface,increasing iron release.Both the oxidation of NO_(3)−and selective sedimentation of Ca2+were found to enhance the stability of corrosion scales and inhibit iron release.
