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Discussion Forums - The Hendrix Group
HomeHomeDiscussionsDiscussionsOil Refinery Co...Oil Refinery Co...Al Brass tube crackingAl Brass tube cracking
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2/7/2006 9:00 AM
 
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I got a Aluminium brass tube which is being used in Platform trim cooler. The tube was carrying sea water and had outside environment of Naptha. It is observed that many tubes near the stack plate support cracked circumferentially. What can be cause of this cracking ? Ambient temperature and pressure. I understand that SCC is ruled out because there is firstly no corrosion in the inside/outside surface and secondly, no halide/ammonia to support this.
 
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2/7/2006 9:00 AM
 
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What is the "Stack Plate Support" ? Is it the same or equiv MOC of Tube or any other CS? Pl. check possibility of Galvanic Corrosion from naptha-tube-plate interface?
 
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2/7/2006 9:00 AM
 
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Stack Plate is SA 516 Grade 70. Very little corrosion observed.
 
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2/8/2006 9:00 AM
 
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Fine. Brass group is much Anodic w.r.t. Iron Alloy in the emf Galvanic Series. As such in presence of electrolyte (naptha having some acidic components) , Brass will be highly affected and thus cracking . Pl. check your MOC & Construction design engineering. Hope it clarifies. regards
 
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2/8/2006 9:00 AM
 
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Thanks for the feedback.
 
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