In view of the leakage of the weld between the body and the lower head of the D2304 washing gas seal tank of the polyethylene device of Yang Petrochemical,the failure of the scrubber seal tank was analyzed through macroscopic inspection,composition analysis,metallogram inspection and hardness test,and the root causes of the leakage caused by excessive welding residual stress and corrosive ion Cl-at the weld were respectively analyzed.Some suggestions are given for checking the water content in the process of late container renewal manufacturing and operation.
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