Abstract
Repeated failures have been experienced in steam coil installed in a water seal vessel. The steam coil was found severely corroded after 9 months of operation especially at the steam inlet. Several samples were collected from different locations for examination and failure investigation. The investigation included visual examination, XRF\CS, and SEM\EDS analysis. It is concluded that the failure mechanism was acid attack caused mainly by sulfuric acid found in the water inside the vessel. It is recommended to eliminate the source of sulfuric acid by controlling the inlet of process gas into the vessel. In addition, measurement of pH and conductivity of the water in the vessel must be conducted regularly. Moreover, under standard operating parameters, material ASTM A-106 Gr. B carbon steel performs well in this environment and material upgrade is not required. However, if it is not feasible to prevent the ingress of sulfuric acid then upgrading the material is necessary.
Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
