March 2012

Special Report: Corrosion Control

Avoid stress corrosion cracking of stainless steel

This case history investigates equipment failure in a glycol unit

Jain, A. D., Reliance Ports and Terminals Ltd.

In hydrocarbon processing industry (HPI) facilities, austenitic stainless steel (SS) is used for several reasons, including:• Avoiding iron pickup and maintaining product purity• Replacing carbon steel in operating services in which carbon steel is unsuitable, such as high temperature, corrosive fluids, highly toxic materials (HTM), etc. However, austenitic SS is susceptible to stress-corrosion cracking (SCC), mainly through trans-granular stress-corrosion cracking (TGSCC), such as chloride-containing aqueous media. The presented case history investigates the SCC failure of SS in a petrochemical unit manufacturing high-purity monoethylene glycol (MEG). The MEG refi

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