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Discussion Forums - The Hendrix Group
HomeHomeDiscussionsDiscussionsGeneral Corrosi...General Corrosi...Corrosion Prevention of FastnersCorrosion Prevention of Fastners
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12/26/2004 9:00 AM
 
Our plant which was commissioned in 1998 has chloroalkali and Epichlorohydrin manufacturing units in the same complex.We have been experiencing severe corrosion of structurals,piping,equipments,pipe supports,bolts/nuts of piping and equipments.For structurals,equipments etc., we are using paint system of epoxy primer 2 coats followed by polyurethane 1 coat to get a total DFT of 250 microns. I would like to highlight the corrosion of bolts/nuts particularly.We are using alloy/carbon steel ASTM A 193 B7,high tensile and Galvanised bolt/nuts. We can not paint the bolts/nuts as we need to dismantle/ open the pipe flanges for maintenance purposes. We have tried protection of bolts/nuts using rust converters but within 3 months the corrosion would start again.Usage of stainless steel bolts is not possible due to cost reasons. We would like to have any suggestions from this forum regarding cost effective solutions on corrosion prevention of bolts/nuts.
 
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12/27/2004 9:00 AM
 
BVSR, Have you heard/considered XYLAN coatings ? These hard, inert coatings seem to do the trick for bolts/fasteners on equipment that requires periodic disassembly Our consulting firm finds these to be be useful in chloroalkali service where galvanized coatings are inadequate and stainless is not appropriate. The company description: "Xylan coatings are a family of products developed by the Whitford Company for use as: lubricant and wear resistant coating, as a seal, as a release or nonstick coating, in materials handling, and under conditions of corrosion. Xylan comes in the 1000 Series for tough industrial applications, and in the 8100 Series, which meets FDA food contact requirements. Multiple colors are available, whether to match their surroundings, or to provide color coding." XYLAN has been used in chemical process plants in applications such as piping flange bolts and vessel manway bolting. MAKE SURE THAT YOU HAVE A REPUTABLE FIRM PEFORM THE COATINGS !!! Also, make use of the XYLAN color coding option if you have bolts of different strengths or materials.. See: www.aic-coatings.com/xylan.htm www.whitfordww.com/ www.secoating.com/fcoatings.html Good Luck !!! MJC
 
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12/30/2004 9:00 AM
 
B.V.S. Rao Another potential solution to the fastener corrosion problem you might consider is Teflon coated bolts and nuts. Hope this help! David Hendrix The Hendrix Group Inc.
 
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1/5/2005 9:00 AM
 
We suppy Ship-2-Shore line of inhibitors which would perform fine for your purpose. They remain liquid and penetrate so fasteners are always easy to disassemble. www.ship-2-shore.com
 
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