During the regular inspection of urban steel gas pipelines,it was found that large areas of external surface corrosion occurred at both ends of the crossing section of buried steel gas pipelines,due to the influence of the external environment.Through visual inspection,leak detection,wall thickness measurement,penetration testing and ultrasonic guided waves,the problematic section of pipeline was detected to evaluate its corrosion severity,and analyzed the causes of corrosion.The results showed that poultry manure and plant secretions damaged the outer surface of crossing steel pipe,causing the anti-corrosion layer to fall off and severe external corrosion,resulting in a large metal corrosion rate,posing serious safety hazards and usage risks.Therefore,the corroded pipeline should be immediately treated with anti-corrosion measures and physically isolated for protection.Daily patrols and supervision should be strengthened.
Steel gas pipelineCrossing pipelineCorrosion analysisCorrosion protection
维普
万方数据
