Failure Analysis of Field Joint Coating(FJC) and Suggestion

The field joint coating(FJC) technology based on heat shrinkable sleeves(HSS) has been used widely in the new oil/gas pipeline projects of PetroChina.However,there was some joint coating failure occurring in installation field.Results of failure analyses in the present work show that it is urgent to improve the performance of key materials,to optimize the installation process and to perfect the current standards and specifications applied to laboratory tests to enhance the quality control of FJC projects.Some suggestions have leen put forward.