Corrosion Fatigue Failure of a Water Injection Line in Oil Operation

摘要

A 24-in (610-mm) water injection line failed by cracking. Testing indicated that the pipe material did not contribute to failure. Deterioration of the external coating led to severe localized corrosion attack and a gradual thinning of the pipe wall. Cracks were initiated from pitting on the outer surface. Low cycle fatigue stresses were created from improper suspension and fixation. The failure was caused by corrosion fatigue.