The corrosion survey for the complex unit during the turnaround finds out the minor corrosion in the primary distillation tower (metallurgy: Q235-B) with a coupon corrosion rate of 0.
联合装置在检修期间进行的腐蚀调查表明：常压分馏系统的初馏塔(材质Q 2 35 - B)腐蚀较轻，挂片腐蚀率为0。
It has been proved that these cracks are caused by sulfide stress corrosion cracking (SSCC) through failure analysis and service environment survey.
通过失效分析和管道服役环境调查，证明开裂原因是管道服役期间发生硫化物应力腐蚀开裂(SSCC)。
According to the investigation and survey, the failure events of pipeline are mainly caused by corrosion, failure of material and construction.
据资料调查分析，输气管道事故主要来自于腐蚀、管材及施工缺陷。
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