Corrosion failure of stainless-steel in caustic soda lines

Author:

Gaur Bhupendra1

Affiliation:

1. Worley India Pvt. Ltd ., Navi Mumbai , India

Abstract

Abstract The paper deals with the case studies of stainless steel piping corrosion in caustic soda transfer lines at a hydrocarbon processing plant, in the Asian region. The lines were in service of transferring the caustic soda solution from the storage tank farm to different process units, for subsequent use in reaction vessels. To maintain a minimum temperature of the fluid to avoid its precipitation, the lines were accompanied by a steam heat-tracer, throughout the line route. The material of construction (MOC) of the line was stainless steel type 316. After a period of about 3.5 years, 2” caustic line suffered fluid leakage, which was noticed through significant salt accumulation over insulation at one location. A valve was also noticed to leak through a weld at a 1.5” distribution line. The affected components were removed from service and subjected to detailed inspection and laboratory investigation, using advanced tools of metallurgical analysis and characterization. It was found that leakage in 2” line had occurred due to poor workmanship used during the repair of a manufacturing defect at the affected location and leakage of the valve had taken place due to the use of improper welding practice (in the case of subjected weld). In addition, the significant role of metallurgical defects in the parent metal was also disclosed to result in the observed failures. In addition, the contribution of process excursions can’t be completely ruled out. Finally, remedial measures are given to avoid the recurrence of such failure.

Publisher

Walter de Gruyter GmbH

Reference15 articles.

1. Caustic soda handbook, Oxychem, Mar 2018, Dallas, TX and material safety data sheet webs – http://msds.oxy.com.

2. Sodium hydroxide storage tanks & specifications, Protank., 21-2102018.

3. MTI publication MS-6, “Materials selector for hazardous chemicals – vol. 6: Ammonia and caustic soda”. Materials technology institute of the chemical process industries, inc., St. Louis, MO (1999)

4. American petroleum institute, damage mechanisms affecting fixed equipment in the refining industry – 1st ed., API-rp 571.

5. A. Al-omari, A. Al-zahrani, G. Lobley, R. Tems, and O. Dias, NACE international corrosion conference and expo corrosion “Refinery caustic injection systems: Design, operation, and case studies” pp.4933, 2008.

同舟云学术

1.学者识别学者识别

2.学术分析学术分析

3.人才评估人才评估

"同舟云学术"是以全球学者为主线,采集、加工和组织学术论文而形成的新型学术文献查询和分析系统,可以对全球学者进行文献检索和人才价值评估。用户可以通过关注某些学科领域的顶尖人物而持续追踪该领域的学科进展和研究前沿。经过近期的数据扩容,当前同舟云学术共收录了国内外主流学术期刊6万余种,收集的期刊论文及会议论文总量共计约1.5亿篇,并以每天添加12000余篇中外论文的速度递增。我们也可以为用户提供个性化、定制化的学者数据。欢迎来电咨询!咨询电话:010-8811{复制后删除}0370

www.globalauthorid.com

TOP

Copyright © 2019-2024 北京同舟云网络信息技术有限公司
京公网安备11010802033243号  京ICP备18003416号-3