Abstract

In recent years, with the development of society, people pay more attention to environmental problems year by year. Because gas has the characteristics of low pollution and high calorific value, the proportion of gas in energy structure is increasing year by year. With the continuous development of civil gas business, the safety of gas pipeline has become a widely concerned focus. How to ensure the safe operation of gas pipeline has become the first problem to be considered by each pipeline gas operators. Civil gas pipeline accidents have the characteristics of sociality, suddenness and complexity. The civil gas pipeline system is distributed in the area where the population and public facilities are concentrated. Once the accident occurs, it not only causes serious casualties and property losses, but also causes social insecurity, environmental pollution and other problems. Therefore, the Chinese regulations, Periodical Inspection Regulation for City Gas Pressure Pipeline and Thermal Pressure Pipeline (TSG D7004-2010), require regular inspection of civil gas pipelines.

During the regular inspection of a gas pipeline, the damaged point of the pipeline anticorrosive coating is found by the PCM (Pipeline Current Mapper) system. We decided to dig the point and make a direct inspection. Two dents and a gouge were found on the pipe. We evaluated these defects according to the technical standard. Because the pipeline delivery can’t be stopped for the time being, we used carbon fiber reinforcement method to repair the defects temporarily. This paper describes in detail the process of defect evaluation and repair, which has certain reference significance for the repair and use management of civil gas pipeline defects.

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