脱乙烷塔的腐蚀原因

Corrosion Reason of a Deethanizer

采用渗透法对某海上油田终端脱乙烷塔塔体外表面进行检测,塔体第一节至第四节筒体共发现56处裂纹,严重影响设备的安全运行。通过微观形貌观察和化学成分分析等方法对脱乙烷塔裂纹产生的主要原因进行了探讨,并提出了相应的解决方法,保证装置安全平稳运行。结果表明:塔体的失效形式为氯化物引起的应力腐蚀开裂,主要是由于塔外保温材料破损导致,可通过更换保温材料或塔体材料等措施进行预防。

Penetration method was adopted to detect the external surface of the deethanizer in an offshore oilfield terminal. The results reveal that there were 56 cracks distributed in the first to fourth sections of the deethanizer＇s barrel. In order to ensure the safety in production, the main cracking causes were analyzed through the methods of microstructure observation and chemical composition analysis, and the resolutions were presented. The results show that the failure was due to SCC induced by chloride and could be resolved by replacing the materials of the thermal insulation or the deethanizero