Causes analysis for leakage of heat exchange tubes
The leaking of some tubes in heat exchanger was observed in a secondary tower's top condenser in one certain distillation deisobutanizer.In order to find out the failure cause and prevent the similar incidents from recurring,the chemi-cal composition,mechanical properties,metallographic structure,and microscopic morphology of the tubes were analyzed to identify the reasons for leaking.The results showed that the heat exchanger tubes had a serious uniform corrosion and local point corrosion perforation,leading to the leaking of tubes.Moreover,the corrosion morphology had the characteristics of microbiological corrosion.Meanwhile,the large size nonmetallic inclusions in heat exchanger tubes accelerated the process of point corrosion perforation of tube wall.
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