Pipe corrosion come mainly from outside -pipe corrosion and corrosive medium transported inside the pipe. Serious inside -pipe corrosion exists in petroleum and sewage transportation piping.

管道腐蚀主要来自管外腐蚀及管内输送的腐蚀介质，输送石油及输送污水的管道内腐蚀更严重。

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Through field cleaning test on 2 water flood pipelines, one sewage transportation pipeline, part old oil pipeline and a scale formed water injection pipeline etc, good result has been gained.

通过对两条注水管线、一条输送污水管线、部分旧输油管线和结垢注水油管的现场清洗试验，证明常温复合清洗液具有很好的清洗效果。

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The double-channel sewage pump has excellent performance and good passing -ability which obtain more widespread application in transportation and processing of city sewage and industrial waste.

双流道污水泵以其良好的性能和较强的过流能力，在城市生活污水、工业废水的输送与处理等方面得到了较为广泛的应用。

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Because so much of our infrastructure including the electrical grid, water and sewage treatment, as well as our transportation system is computerized.

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Civil engineers design and develop the construction of transportation infrastructure and water supply and sewage systems, after attaining at least a bachelor's degree in engineering and several years of experience.

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For example, food distribution, transportation, telecommuni-cations, medical services and access to clean water and management of sewage would be among those affected almost immediately and for long periods of time.

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