Insulation Failure Judgement Method of Rigid Polyurethane Foam Insulating Layers on Buried Pipelines

With the increase of long-distance pipelines,corrosion caused by the external coating failure of buried pipelines is concerned about increasingly.Based on research results in relevant fields,by using ANSYS simulation analysis,the insulation failure judgement method and mathematic model have been established.The results show that the criterion is reliable and useful.