(13b) Polythionic Acid Stress Corrosion Cracking
AIChE Spring Meeting and Global Congress on Process Safety
2009
2009 Spring Meeting & 5th Global Congress on Process Safety
The 21st Ethylene Producers’ Conference
Ethylene Plant Contaminants: Myths and War Stories
Monday, April 27, 2009 - 8:20am to 8:50am
The most common fluid that causes Inter Granular Stress Corrosion Cracking (IGSCC) in petrochemical plants and refineries is polythionic acid. Polythionic acid is formed in the presence of sulfur, moisture and oxygen. Sulfur can come from feed stock, additives or fuels. This failure mechanism is possible from both inside and outside of a tube, depending on the sulfur source. IGSCC is most common in sensitized 300 series stainless steel and higher nickel base austenitic alloys.
This paper will describe the details of polythionic acid formation, case histories of failures and its mitigation.
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2009 Spring Meeting & 5th Global Congress on Process Safety
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The 21st Ethylene Producers’ Conference only
| AIChE Pro Members | $100.00 |
| Fuels and Petrochemicals Division Members | Free |
| AIChE Graduate Student Members | Free |
| AIChE Undergraduate Student Members | Free |
| AIChE Explorer Members | $150.00 |
| Non-Members | $150.00 |