Frontier -technology application -pipelines repairing engineering

Because of long time use ,Natural gas and oil pipelines inner surfaces will be corroded ,and has the risk of safety.Especially with construction of several decades ,most of pipelines has been covered by the buildings and streets.If repair these pipes by excavation ,it will be a big costs ,and affect the city traffics ,even hard to put into effect .But as the technology goes,a new non-excavation pipe repairing technology has been practiced in the engineering.Because advantages of oil-resistance,anti-aging and other good performances, this hose has been applied in engineering wide-spread,besides it solves the challenge of big project expenses in the city rigid and harsh position,to some extent,it prolongs the life of service and leads to  more economic and social benefits.