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Case histories are presented where Oxygen ingress has led to Sulfur corrosion failures in pipelines and downhole equipment.
Sulfur corrosion is usually associated with high H2S systems but sulfur can also be deposited in systems containing small amounts of H2S under conditions where oxygen is allowed to enter the gas stream. Oxygen ingress may be due to air drawn in by elements such as compressors or vapour recovery units on oil tanks or may be carried in by methanol injected for hydrate control. The solubility of oxygen in methanol is significantly higher than in water and sufficient amounts can be present to react with H2S and deposit elemental sulfur. Case histories are presented where this has led to failures in pipelines and downhole equipment. Key words: Sulfur, sour gas, methanol, oxygen, vapor recovery unit, line failure.
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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.