摘要
分析了塔里木油田某联合站天然气处理单元的中压气冷却器出口到原料气压缩机出口分离器入口管线中的腐蚀监测挂片发生氢鼓泡的原因。通过对现场4件腐蚀监测挂片及1件库存的20G管线试片进行理化性能分析,并对20G管线试片进行抗氢致开裂(HIC)性能检测。结果表明,该管线试片的化学成分和金相组织均符合标准中对于20G材质的要求;腐蚀监测挂片表面出现的氢鼓泡主要是由于输气中H2S浓度过高引起的;管线试片的金相剖面裂纹厚度敏感率超过标准要求,发生硫化氢氢致开裂的风险极高。因此,20G材质在该工况条件下使用时,需加强腐蚀监测和壁厚检测,并考虑通过在湿硫化氢介质进入管线前添加脱硫装置或投加缓蚀剂来减缓腐蚀,延长管线的使用寿命。
The causes of hydrogen blistering for corrosion monitoring coupons were analyzed. The coupons were located in the entrance pipeline from medium pressure gas cooler oudet to raw gas compressor outlet separator, in a united station natural gas processing unit of the Tarim oilfield. The physiochemical properties of 4 pieces of corrosion monitoring coupons on the scene and 1 piece of 20G pipeline test piece in-store were analyzed, and the HIC performance of 20G pipeline test piece was tested. The results showed that the chemical composition and metallographic microstructure of tested piece of pipeline met the standard requirements for 20G material. The hydrogen blistering of corrosion monitoring coupons was mainly caused by the high concentration of HzS in the pipeline. Metallographic section crack thickness sensitive rate of pipeline test piece exceeded the standard requirements, There is a high risk of hydrogen-induced cracking. Therefore, when 20G material is used in the condition, the corrosion monitoring and testing of wall thickness needs to be strengthened, Installing desulfurization device or adding corrosion inhibitor to slow down the corrosion before the wet hydrogen sulfide medium into the pipeline showed be considered for extending the service life of the pipeline.
出处
《腐蚀与防护》
CAS
北大核心
2015年第7期687-691,共5页
Corrosion & Protection
关键词
湿硫化氢环境
20G
氢鼓泡
氢致开裂
wet hydrogen sulfide environment
20G
hydrogen blistering
hydrogen induced cracking
