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Continued from The MP Blog, p. 13. The following items relate to coatings & linings. Please be advised that the items are not peer-reviewed, and opinions and suggestions are entirely those of the inquirers and respondents. NACE International does not guarantee the accuracy of the technical solutions discussed. MP welcomes additional responses to these items. They may be edited for clarity. Painting of valves • Some of the valves we have received from our vendors have no primer on them. Do these valves need blasting for the inorganic primer that is to be applied with the subsequent intermediate coat and topcoat? The required dry flm thickness is about 5 to 6.5 mils (152 to 165 µm). • Some valves that we have received from our vendors are already painted. Can I apply the intermediate coat and topcoat directly on it? A A Yes, you need to blast per specifcation or that zinc will pop off. I would check with the vendor to see what was applied to the The skid has piping and valves valves, then check to see if it is within that will be coated depending upon the specifcation. temperature. The painting specifcations To answer the frst question, you call for using different paint for the mahave to sandblast it to the paint terials with temperatures less than and manufacturer's required surface greater than 80 °C. The equipment must cleanliness before you apply the be painted with a three-coat system. I inorganic zinc. Regarding the second have the following questions: Q 48 We are in the process of manufacturing a gas compression skid. MATERIALS PERFORMANCE May 2013 question, is the existing coating provided by the valve supplier a temporary one just to protect the valve from corrosion during shipment? If yes, then you have to sandblast it to the required surface cleanliness and apply the coating materials as per your specifcation. If it is a permanent coating, then you can apply a compatible intermediate and topcoat protective coating. Software for protective coatings Is anyone aware of any software that contains standards and specifcations on what kind of surface preparation and coating linings (generic names) are best for particular environments and structures of steel and concrete? Q NACE International, Vol. 52, No. 5