Failure modes and mechanisms in gray cast iron pipes
Failure modes and mechanisms in gray cast iron pipes
复制标题
灰口铸铁管的失效模式和机制
DOI：
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发表时间：
2020
期刊：
影响因子：
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通讯作者：
S. McDonald
中科院分区：
文献类型：
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作者：
J. Makar;R. Desnoyers;S. McDonald
铸铁水管的故障比业内广泛理解的更为复杂和多样。本文讨论了加拿大国家研究理事会在三年的调查中遇到的管道失效的模式和原因。除了腐蚀，制造缺陷，人为错误和管道负载的意外水平都在每年发生的大量管道故障中发挥作用。Pars Ethylene Kish Co. www.pars t yle e.com www.parsethylene-kish.com（+98 21）88 20 20 60 info@parsethylene-kish.com www.example.com由于管道中的水的温度与周围土壤的温度之间的差异，可能产生热作用力。另一种可能导致管道破坏的荷载条件是土壤通过摩擦锁定在管壁上。土壤运动可能会在管道中产生张力，产生简单的拉伸破坏。最后，铅矿，一种在20世纪40年代和50年代使用的硫基接缝密封化合物，由于其热膨胀系数与其密封的管道中的金属热膨胀系数之间的差异，似乎会产生管道故障。该机制将在第3.3节中进一步讨论
Failures in cast iron water mains are more complex and diverse than is widely understood in the industry. This paper discusses the modes and causes of pipe failures that have been encountered during a three year investigation by the National Research Council Canada. In addition to corrosion, manufacturing defects, human error and unexpected levels of pipe loading all play a role in the large number of pipe failures that occur each year. Pars Ethylene Kish Co. www.pars t yle e.com www.parsethylene-kish.com (+98 21) 88 20 20 60 info@parsethylene-kish.com ww w. p rs et hy l ne -k ish .c om possibly thermal forces due to differences between the temperature of the water in the pipes and the surrounding soil. Another possible loading condition that can cause pipe failures is one produced by soil locking to the pipe wall through friction. Soil movements may then produce tension in the pipe, producing simple tensile failures. Finally, leadite, a sulphur based joint sealing compound used in the 1940s and 1950s appears to produce pipe failures due to the difference between its coefficient of thermal expansion and that of the metal in the pipes it seals. This mechanism is discussed further in Section 3.3