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Discussion Forums - The Hendrix Group
HomeHomeDiscussionsDiscussionsMaterial Select...Material Select...Corrosion of Heat ExchangerCorrosion of Heat Exchanger
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5/5/2010 9:00 AM
 
Dear All, I have cupper/nickel alloy ( 70 Cu, 30 Ni) heat exchanger with sea water cooling media. The baffle(naval brass) of Heat exchanger is heavily corroded, Can any body tell the reasons.
 
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5/6/2010 9:00 AM
 
Dear Abdullah, Naval brass if in 'natural' seawater is prone to heavy corrosion and intense dezincification. However, due to lesser costs and some resistance to dezincification induced by tin content in Naval Brass, it is still being used by many while having a look on operating parameters. You may look into the operating conditions also, low velocity and stagnant water containing much of sulphur, carbondioxide and oxygen would tend to increase dezincification. If process / operations engineers cannot do anything good with the operating conditions, then frequent failures may trigger its replacement with one grade higher which may be Aluminium Bronze (UNS C61400). Hope this would help. Regards, Ashfaq Anwer http://thepetrostreet.com
 
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6/15/2010 9:00 AM
 
Hello Mr. MAbdullah, As per my understanding, 70:30 material is provided on sea cooling water side i.e. cooling water flows through tubes. Baffles in heat exchnager are exposed to shellside medium. If shellside medium contatins H2S, Acid, Sour or any other corrosive medium, baffles get corroded. Kindly check the material suitability w.r.t shellside medium. ============== Purav Desai
 
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