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Discussion Forums - The Hendrix Group
HomeHomeDiscussionsDiscussionsGeneral Corrosi...General Corrosi...Exhaust Wall Catatropic Failure.Exhaust Wall Catatropic Failure.
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2/29/2004 9:00 AM
 
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We have an exhaust system that has been out fitted with air injection to burn any of the exhuast not combusted at the engiine. Temperatures run 1400 F prior to the injection and up to 1800 Fafter. The exhaust is 304SS, sch5s -6" diameter. I suspect that the shear temperature limitations cause failure of the exhuast tube, however it has been insulated in its entirety with removal insulation. The insulation is encased with a monel .011 wire mesh and a silica cloth fabric, both rated to a countinous use of 2000F. Both the cloth and mesh have also corroded to mere dust. It should be noted that there is small air spaces around the pipe as the insulation is 2' thick and flat in its relaxed state and is formed around the pipe creating folds. Is there a relationship between the stainless corrocsion and the other materials or is something alse going on?
 
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3/1/2004 9:00 AM
 
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Ron: Thank you for your interest in our corrosion discussion forumYour description of the process was appreciated. However, it doesn't substitute for being able to observe the deteriorated components. In general, we offer the following comments: (1) 1800F is high for 304SS, based on oxidation, (2) monel is not usually specified for elevated temperature service, based on its lack of strength at temperature and it inferior oxidation resistance, as compared with other more commonly specified high-temperature alloys. In saying the "Monel has corroded to mere dust" we assume that you have had a formal, laboratory analysis done to verify your statement. We cannot comment on the deterioration of the silica cloth, which, based on temperature, should hold up at 1800F. Feel free to call and we can discuss. David Hendrix The Hendrix Group Inc.
 
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