The aim of the present work is to monitor dew point corrosion of crude and vacuum distillation column overhead section in a petroleum refinery. The material of construction of overhead line pipe was carbon steel. The state of art of crude unit process was introduced. The corrosion and associated hydrolyzing mechanisms were briefly described. The crude processing in a petroleum refinery was extremely dynamic and thus field monitoring attempts were made, which provides some useful information on structural integrity of column downstream equipments. The demulsifier, neutralizer, and corrosion inhibitor were mixed in crude unit at specific locations for corrosion prevention. Field monitoring includes evaluation of pH and chloride content of desalter extracted water and overhead condensed water, Base Sediment & Water (BS&W) and chloride content of as-received & desalted crude, and iron content of overhead condensed water. Furthermore, corrosion coupon was installed in overhead section to obtain the actual corrosion rate. All the field study was conducted for a specified period. The acidity, chloride concentration, and iron loss of condensed water confirmed that acidic corrosion was under control. The corrosion rate of the installed coupons confirmed that corrosion rate was within the specified limit. The results revealed in this paper intended for refinery operators and corrosion engineers involved in understanding of actual process parameters in prevention of overhead acidic corrosion.

中文翻译：

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石油精炼厂原油和真空蒸馏塔塔顶馏出物的腐蚀防护：现场监测研究

本工作的目的是监测石油精炼厂的原油蒸馏塔和真空蒸馏塔顶段的露点腐蚀。架空线管的建筑材料为碳素钢。介绍了粗单元工艺的最新技术。简要描述了腐蚀及其相关的水解机理。石油精炼厂的原油加工非常动态，因此进行了现场监测尝试，这为塔下游设备的结构完整性提供了一些有用的信息。为了防止腐蚀，将破乳剂，中和剂和缓蚀剂在原油装置中的特定位置混合。现场监测包括评估淡水萃取水和塔顶冷凝水，基础沉积物和水（BS＆W）和接收和脱盐后的原油中的氯化物含量，以及塔顶冷凝水中的铁含量。此外，将腐蚀试件安装在顶部区域以获得实际腐蚀速率。所有的现场研究都是在指定的时间内进行的。冷凝水的酸度，氯化物浓度和铁损失证实了酸性腐蚀得到了控制。安装的试片的腐蚀速率证实腐蚀速率在规定的极限范围内。本文揭示的结果供精炼厂操作员和腐蚀工程师使用，他们需要了解实际过程参数以防止产生过高的酸性腐蚀。将腐蚀试样安装在顶部区域以获得实际腐蚀速率。所有的现场研究都是在指定的时期内进行的。冷凝水的酸度，氯化物浓度和铁损失证实了酸性腐蚀得到了控制。安装的试片的腐蚀速率证实腐蚀速率在规定的极限范围内。本文揭示的结果供精炼厂操作员和腐蚀工程师使用，他们需要了解实际过程参数以防止产生过高的酸性腐蚀。将腐蚀试样安装在顶部区域以获得实际腐蚀速率。所有的现场研究都是在指定的时期内进行的。冷凝水的酸度，氯化物浓度和铁损失证实了酸性腐蚀得到了控制。安装的试片的腐蚀速率证实腐蚀速率在规定的极限范围内。本文揭示的结果供精炼厂操作员和腐蚀工程师使用，他们需要了解实际过程参数以防止产生过高的酸性腐蚀。