Selection of coating system to prevent CUI
Selection of coating system to prevent CUI
(OP)
Has it been proven that carbon steel surface needs coating system to prevent CUI. I understand there are various factors that control the CUI, coating system alone cannot prevent. The new API RP 583 does not address selection of coating system. It's easy to say that one need to select a right coating system based on the full understanding of CUI, but, my basic question is what is the percent of success on carbon steel surface coating aginst CUI. This is just to alleviate my reservation against coating to protect CUI on carbon steel.





RE: Selection of coating system to prevent CUI
RE: Selection of coating system to prevent CUI
Consult NACE SP0198 and API RP 581, Part 2, Section 17.
Steve Jones
Materials & Corrosion Engineer
http://www.linkedin.com/pub/8/83b/b04
RE: Selection of coating system to prevent CUI
Is there a reason for the bold italics? Now that I know what CUI means, I have no opinion to offer the OP.
RE: Selection of coating system to prevent CUI
Steve Jones
Materials & Corrosion Engineer
http://www.linkedin.com/pub/8/83b/b04
RE: Selection of coating system to prevent CUI
RE: Selection of coating system to prevent CUI
Steve Jones
Materials & Corrosion Engineer
http://www.linkedin.com/pub/8/83b/b04
RE: Selection of coating system to prevent CUI
RE: Selection of coating system to prevent CUI
If we all did that, you would lose the advantage. It just looks rude to me...shouting.
RE: Selection of coating system to prevent CUI
RE: Selection of coating system to prevent CUI
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RE: Selection of coating system to prevent CUI
Steve Jones
Materials & Corrosion Engineer
http://www.linkedin.com/pub/8/83b/b04
RE: Selection of coating system to prevent CUI
The decision to paint, or not, should be based on the corrosion risk assessment. You are building a case for low probability of CUI occurrence. Now consider the consequences of a leak or rupture if it occurs, followed by how much inspection would be incurred in trying to find the CUI before a leak or rupture. Of course, painting does not provide immunity, but it can help with the probability. So, as you can see, it is very difficult to advise whether to paint or not because we can't perform the risk assessment.
Steve Jones
Materials & Corrosion Engineer
http://www.linkedin.com/pub/8/83b/b04
RE: Selection of coating system to prevent CUI
http://www.paintsquare.com/webinars/?fuseaction=ar...
RE: Selection of coating system to prevent CUI
We seem to forget the “I” in CUI and underestimate the influence of proper insulation design.
The NACE emphasizes on coatings and clearly favours TCA for heavy duty environments. My issue with the NACE SP0198 is that it doesn’t focus enough on the influence of insulation. We all know that wet saturated insulation creates the unwanted electrolyte, so my point is to engineer a fit-for-purpose insulations systems that allows water/moisture to drain or evaporate. There are several well documented standards which describe the use of drainplugs, aircavities, non-contact insulation or the use wicking materials. Any coating whether it’s zinc, silicate coating or even TSA are subject to the QA/QC regime and the quality level of application. Also the equipment design e.g. chamfer all sharp edges, drain holes in vacuum rings, protrusions etc. have a big influence whether a coating will meet it’s expected lifecycle. The EFC 55 CUI guideline, which is currently under review for an update, has a multi disciplinary approach which also covers a RBI method. Lets remember that CUI like any other unwantend corrosion is a organisation issue which is primary an asset-owners responsibility.
Regards
Johan
www.linkedin.com/in/johansentjens
RE: Selection of coating system to prevent CUI
RE: Selection of coating system to prevent CUI