Pipeline in service, inevitably due to corrosion, fatigue and mechanical damage caused by pipeline defects, reducing the maximum safe operating pressure and reliability of the pipeline. Practice has proved that the pipeline testing - assessment - repair reinforcement is to ensure the integrity of the pipeline an effective way. Fracture mechanics, damage mechanics and damage mechanics model, and evaluate the residual strength of the defect pipeline. Combining with the law of the growth of the defect, the prediction of the damage and damage of the coating and the pipe body is made by using the inner or outer detection technology. Remaining life of defective pipeline.

Pipeline repair and reinforcement technology is to ensure the integrity of the pipeline and extend the life of an important means of the pipeline. For the pipeline repair reinforcement technology research and development is also an effective way to save social resources, pipeline repair reinforcement method can be roughly divided into three types and eight small types:

(1) welding types: (a) surfacing; (b) patch; (c)

(2) fixture type: (d) ordinary fixture; (e) note injection of epoxy;

(3) fiber composite material type: (f) glass fiber composite material repair; (g) carbon fiber composite material repair; aramid fiber composite material repair.

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