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Assessing Stress Corrosion Cracking Risks on Stainless Steel Piping and Equipment

This paper focuses on the risks of polythionic acid and chloride stress corrosion cracking, and reviews the risks from both internal process services and from external atmospheric and/or wet insulation conditions.

Product Number: 51317--8899-SG
ISBN: 8899 2017 CP
Author: Tina Tajalli
Publication Date: 2017
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Stress corrosion cracking (SCC) is one of the most prevalent root causes of stainless steel failures in the refining industry. This paper focuses on the risks of polythionic acid (PTA) and chloride SCC, and reviews the risks from both internal process services and from external atmospheric and/or wet insulation conditions. Steps can be taken to mitigate the risk of SCC, but since changes in the process or external conditions can occur over time, periodic unit reviews are beneficial. This paper also discusses setting the risk-based inspection ratings for these possible damage mechanisms, and suggested methodologies for determining these risk ratings. These methodologies are complementary to the recommendations given in API(1) RP 581, “Risk-Based Inspection Technology” and this paper gives separate review steps for the internal and external risks.

Keywords: Stress Corrosion Cracking, SCC, chloride, polythionic acid, stainless steel, CUI, insulation

Stress corrosion cracking (SCC) is one of the most prevalent root causes of stainless steel failures in the refining industry. This paper focuses on the risks of polythionic acid (PTA) and chloride SCC, and reviews the risks from both internal process services and from external atmospheric and/or wet insulation conditions. Steps can be taken to mitigate the risk of SCC, but since changes in the process or external conditions can occur over time, periodic unit reviews are beneficial. This paper also discusses setting the risk-based inspection ratings for these possible damage mechanisms, and suggested methodologies for determining these risk ratings. These methodologies are complementary to the recommendations given in API(1) RP 581, “Risk-Based Inspection Technology” and this paper gives separate review steps for the internal and external risks.

Keywords: Stress Corrosion Cracking, SCC, chloride, polythionic acid, stainless steel, CUI, insulation

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