CoatingsPro Magazine

MAR 2018

CoatingsPro offers an in-depth look at coatings based on case studies, successful business operation, new products, industry news, and the safe and profitable use of coatings and equipment.

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Page 19 of 84

COATINGSPRO MARCH 2018 19 blast-cleaning. A ll plates were blasted and received a zinc primer. A: Did you check the sur face pr ior to the application of the pr imer to ma ke sure the sur face was c lean and f ree of r ust and contaminants? A: It actually depends on proce- dure. But generally, you need to check roughness by a suitable device (in a range of 50‒100 microns [2.0‒3.9 mils]) and inspect the dry film thick- ness (DFT) of each layer. Check the project procedure for the range. At the end, try to cross test. A lso, don't forget to review the certificate of the paint material. A: W hen no specification is on the table, as I suspect is your case, usually the applicator follows with the owner's indication or one of the requirements and coating systems shown in the paint manufacturer data sheet. e inspector's job is not to decide the requirements, but to make sure those requirements are followed by the applicator. TSA Coatings Q: I have recently been asked to apply thermal sprayed alumi- num (TSA) to stainless steel (SS). My reaction was to advise the client that this is not something that is practiced in the coatings industr y, and I would require a waiver for any liability. As this saga drags on and more informa- tion comes to the forefront, it seems I am wrong and that the application of TSA on a properly prepared SS surface is often being practiced and executed w ithin our industr y. W hat are your experiences? A: It is normally applied for controlling corrosion under insulation (CUI). A: I am facing the same scenario right now on my project in the Middle East, where a SS vessel (to be insulated) must be coated w ith TSA . W hat is the advantage of apply ing TSA on SS vessels under insulation? Ser vice temperatures are above the minimum of 60 °F (15.6 °C), and on some vessels are above 150 °F (65.6 °C). A: NACE standard SP-198-2010 ["Control of Corrosion Under ermal Insulation and Fireproofing Materials — A Systems Approach "] specifically lists TSA as an acceptable corrosion-mitigating coating for use in CUI service. CP Contractor's Corner Re ad e r In qui r y at co ati n g sp ro m a m /i n q0318

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