In order to define the reasons for inner wall cracking of gravity separator in natural gas decarbonization system,multi-ple testings were applied to study the failed samples.Based on the results of crack morphology analysis,hardness analysis,mate-rial chemical composition analysis,metallographic structure analysis and crack filler energy spectrum analysis,it is concluded that improper material selection of equipment lining caused material sensitization during welding process.Then intergranular stress corrosion cracking occurred under the combined action of corrosive medium and stress.Targeted preventive measures were put forward according to the root cause analysis of inner wall cracking.
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