1/SSPC-SP 5. White Metal Blast Cleaning. This NACE International (NACE)/ SSPC: The Society for Protective Coatings standard represents a consensus of. Requirements for “White Metal” – one of five levels of cleanliness of steel surfaces achieved by blast cleaning with the use of abrasives. (White Metal, Near-White. SSPC-SP5. A Sa 3, B Sa 3, C Sa 3 and D Sa 3. SSPC-SP A Sa 2½, B Sa 2½, C Sa 2½ and D Sa 2½. SSPC-SP6. B Sa2, C Sa 2 and D Sa 2. SSPC-SP7.
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SP 5/NACE No. 1, White Metal Blast Cleaning
If the recently blasted surface is exposed to salts, moisture, contamination or a corrosive environment, rust can occur easily. Sspx order to select an appropriate abrasive, the type, grade, and surface condition of the steel need to be considered. Did you find this article useful? The abrasives selected for this method depend on a sxpc of factors. Therefore, it is often better than other blast cleaning as it requires higher standards of a clean surface.
White metal blast cleaning is to be used to clean unpainted or painted steel surfaces prior to applying high-performance protective coating or lining systems. As mentioned prior, after blast cleaning, be sure to meet all surface standards as presented in the coating specification documents.
Please note random staining, light shadows, discoloration are not allowed to remain on the surface. The procurement documents are part of the contract and have established requirements that must be met per project.
NACE No. 1-SSPC-SP 5, White Metal Blast Cleaning_百度文库
Return to coating inspection. Therefore, fewer imperfections are acceptable with white metal blast cleaning. Substrate temperature should not be colder surrounding air temperature; otherwise, the moisture can condensate on the cleaned-blast surface and cause flash rust.
Most coating specification requires a ssc profile measurement by Press-O-Film replica test or commercial name as testex tape test.
SSPC-SP 5 white metal blast cleaning is preferred to other methods if cleanliness is an spsc factor.
The sandblasting process should not be done sslc the surface temperature is less than 5-degree Fahrenheit or 3-degree Celsius above the dew point.
Therefore, always be certain to remove visible rust prior to continuing with the new coating system. Once the methods above have been applied, be sure to remove all visible residues from the surface.
The dew point is the temperature that condensation starts. I understand that you will use my information to send me a newsletter.
SSPC-SP 5 White Metal Blast Cleaning (NACE No. 1)
Some coating specification requires a surface dust test being performed. Abrasives are used for grinding, polishing, or cleaning hard surfaces. The amount of surface profile depends on coating specificationbut most of the specifications requires 2 thru 3 mils.
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White metal blast cleaning is also used when immersion service requires the highest level of cleaning. Leave me a comment in the box below.
I am at least sspv years sspf age. This can be achieved with the use of brushing, blowing off residue with clean, dry air, and vacuum cleaning. In order to be able to apply white metal blast cleaning be sure that all visible oil, grease, and other contaminant residues are removed. Also, prior to continuing with the coating, be sure to remove any visible rust that forms on the steel surface after blast cleaning. We will be updating and growing this site with more and more of industrial inspection related articles.
Enter Your First Name optional. The coating specification also might call for chloride testing to ensure deposited soluble salts are not higher the permissible limit. The abrasive used for White metal blast cleaning should be dry and free of any contaminants, such as oil, grease, etc.
The air compressor also should be checked for oil and water contamination by Blotter Test. As with all standards, it is very important to take the necessary precautions when working with blast cleaning.