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Conference Paper - This paper describes the requirements of the standard, additional inspection points, and several uses of the standard in the field where clear specification language was imperative to successful project completion. NACE 5/SSPC-SP 12 standard confined to water jetting - which makes use of ultra-high pressure water that is nonabrasive. Four levels of visible post-cleaning condition and three levels of non-visible condition are defined.
The use of water jetting and water cleaning has increased recently with advances in equipment technology, the continued concerns with dusting caused by abrasive blast cleaning, and a heightened awareness of the need for chemically clean substrates. NACE 5/SSPC-SP 12 was introduced in 1996 (as an update to NACE Standard RP0172) to describe levels of cleaning using water for substrates to be painted. The NACE and SSPC abrasive blast cleaning standards are well known in the coatings industry and field inspectors are very familiar with their use and interpretation. Additionally, the blast cleaning standards clearly describe one end condition of the substrate to be painted. In contrast, NACE 5/SSPC-SP 12 describes four end conditions of the substrate for visible cleanliness and three conditions for non-visible cleanliness. As a result, the specifier must make specific choices when invoking NACE 5/SSPC-SP 12. This paper describes the requirements of the standard, additional inspection points, and several uses of the standard in the field where clear specification language was imperative to successful project completion.
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 Metal, Commercial, Industrial, Brush Off)
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NACE/SSPC Joint Surface Preparation Standards Package.
SSPC-SP 5/NACE No. 1-2006, White Metal Blast Cleaning
SSPC-SP 10/NACE No. 2-2006, Near-White Metal Blast Cleaning
SSPC-SP 6/NACE No. 3-2006, Commercial Blast Cleaning
SSPC-SP 7/NACE No. 4-2006, Brush-Off Blast Cleaning
SSPC-SP 13/NACE No. 6-2018, Surface Preparation of Concrete
SSPC-SP 14/NACE No. 8-2006, Industrial Blast Cleaning
HISTORICAL DOCUMENT. This NACE International/SSPC joint standard practice covers the preparation of concrete surfaces before the application of protective coating or lining systems. The standard includes two updated tables, Table 1 details classes of surface preparation, and Table 2 provides minimum acceptance criteria for concrete surfaces before coatings are applied and relevant test methods. The updated Appendix (nonmandatory) includes two additional tables, Table A1 provides typical surface properties of finished concrete, and Table A2 provides an extensive list of surface preparation methods for concrete surfaces. This standard should be used by specifiers, applicators, inspectors, and others who are responsible for defining a standard degree of cleanliness, strength, profile, and dryness of prepared concrete surfaces.