一、课题由来管道运输是石油、天然气最经济、合理的运输方式。由于石油、天然气的易燃、易爆性和具有毒性等特点,管道的安全运行非常重要。油气输送管道长时间服役后,会因外部干扰、腐蚀、管材和施工质量等原因发生失效事故,导致火灾、爆炸、中毒,造成重大经济损失、人员伤亡 First, the subject line Pipeline transportation is the most economical and reasonable mode of transport of oil and natural gas. Due to the flammable, explosive and toxic nature of petroleum and natural gas, the safe operation of the pipeline is very important. After a long period of service, oil and gas pipelines will fail due to external interference, corrosion, pipe material and construction quality, causing fire, explosion and poisoning, resulting in significant economic losses and casualties