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原文传递 Common Causes of Material Degradation inBuried Piping (U)

题名：	Common Causes of Material Degradation inBuried Piping (U)
作者：	C. F. Jsnkins
关键词：	degradation；material；cause；common；ping；chemistry；applications；mechanica；mechanism；chemical
摘要：	Buried pipe may fail for innumerable reasons. Causes can be mechanical damage/breakage, chemically initiated corrosion, or a combination. Failures may originate either internally or externally on the pipe. They may be related to flaws' in the design, to excessive or unanticipated internal pressure or ground level loading, and/or td poor or uncertain installation practice. Or the pipe may simply "wear out" in service. Steel is strong and very forgiving in underground applications, especially with regard to backfill. However, soil support developed through densification or compaction is critical for brittle concrete and vilified clay tile pipe, and. is very important for cast iron and plastic pipe. Chemistry of the soil determines whether or not it will enhance corrosion or other types of degradation. Various Causes and mechanisms for deterioration of buried pipe are indicated. Some peculiarities of the different materials of construction are characterized. Repair methods and means to circumvent special problems are described.
报告类型：	科技报告