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09358 Corrosion Mitigation and Monitoring in Sulfur Recovery Unit

This paper will demonstrate the fundamental corrosion issues encountered in Sulfur Recovery Units. It will address the Claus process chronic corrosion problems such as sulfidation, sour environment cracking, weak acid corrosion, etc.

Product Number: 51300-09358-SG
ISBN: 09358 2009 CP
Author: Salah I. Al-Luqman, Majed M. Al-Qarni and Iyad Buraiki
Publication Date: 2009
Industry: Petroleum Refining
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The main objective of Sulfur Recovery Units (SRU) is to remove sulfur compounds (mainly hydrogen sulfide) from gases produced by sweetening of refinery or sour field production gases. The sulfur compounds are converted to elemental sulfur, and then the sulfur is condensed to liquid sulfur. The feed contains mainly hydrogen sulfides coming from amine and sour water units. Corrosion is a major concern in SRUs due to the presence of a high percentage of hydrogen sulfide, as well as high temperatures in most of the unit’s equipment.

This paper will demonstrate the fundamental corrosion issues encountered in SRUs. In addition, it will address the Claus process chronic corrosion problems such as sulfidation, sour environment cracking, weak acid corrosion, and other damage mechanisms. Moreover, it will propose protective actions and applicable corrosion monitoring techniques to avoid reoccurrence of corrosion problems.

Keywords: Claus process, Sulfidation, corrosion rate, damage mechanism, Corrosion Mitigation

The main objective of Sulfur Recovery Units (SRU) is to remove sulfur compounds (mainly hydrogen sulfide) from gases produced by sweetening of refinery or sour field production gases. The sulfur compounds are converted to elemental sulfur, and then the sulfur is condensed to liquid sulfur. The feed contains mainly hydrogen sulfides coming from amine and sour water units. Corrosion is a major concern in SRUs due to the presence of a high percentage of hydrogen sulfide, as well as high temperatures in most of the unit’s equipment.

This paper will demonstrate the fundamental corrosion issues encountered in SRUs. In addition, it will address the Claus process chronic corrosion problems such as sulfidation, sour environment cracking, weak acid corrosion, and other damage mechanisms. Moreover, it will propose protective actions and applicable corrosion monitoring techniques to avoid reoccurrence of corrosion problems.

Keywords: Claus process, Sulfidation, corrosion rate, damage mechanism, Corrosion Mitigation

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