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Discussion Forums - The Hendrix Group
HomeHomeDiscussionsDiscussionsGeneral Corrosi...General Corrosi...pitting corrosion: caustic environmentpitting corrosion: caustic environment
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10/1/2006 9:00 AM
 
We have faced deep pitting corrosion of caustic line opearting at ambient (40 c) condition. caustic concentration is about 50%. under what condition such type of pitting will occur. is it possible for casutic to get deposited on the wall surface under ambient condition.
 
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10/9/2006 9:00 AM
 
Rizwan: You should verify if the caustic is freezing and providing sites for underdeposit corrosion. Also, check the chloride content of the caustic. The line also should be stress relieved to prevent caustic SCC. Hope this helps! David Hendrix The Hendrix Group Inc.
 
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10/9/2006 9:00 AM
 
Hi , My Name is selvan I would like to knowis it possible to use SS 316 L materials for the caustic injection skid Thanking you in advance
 
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10/12/2006 9:00 AM
 
Selvan, Material selection for caustic will depends on service temperature.If you indicate the service temperature i can suggest the suitable material.Carbon steel material can be used up to 60 deg.c provided the weld joints should be stress relived to avoid caustic Stress corrosion cracking. regards, krish
 
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2/27/2009 9:00 AM
 
[updated:LAST EDITED ON Feb-27-09 AT 08:45 AM (CDT)]My company recieved some 3 & 400nb sch120 A106 pipe a few months ago with an inteded use on a gas compressor station. The pipe was fabricated & PWHT'd. After PWHT with the laquer removed the internal & external surfaces look "pitted" or dimpled. From what I have read pitting is generally associated with alloys or stainless/nickel etc & not with carbon which generally corodes evenly. My theory about the appearance of the surface of the materials is that the surface coating (laquer) was poorly applied & general corrosion has occured between the coating & the material surface. I would appreciate any comments or information in regards to pitting in carbon materials etc I would also appreciate any suggestions on how to deal with the problem ie is there anything else I can do other than UT the materials in order to proove the integrity of the materials.
 
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