NACE No. 1/SSPC-SP 5 White Metal Blast Cleaning This NACE International ( NACE)/SSPC: The Society for Protecti Download. 1/SSPC-SP 5 White Metal Blast Cleaning This NACE International (NACE)/SSPC : The Society for Protective Download "Joint Surface Preparation Standard. This page contains a list of SSPC standards either new or updated from to the present. Click Here to Download the List of Standards.
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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. Picture for NACE No. 1 SSPC SP-5 White Metal Blast Cleaning. Available for download. Requirements for "White Metal" - one of five levels of cleanliness of steel. SSPC-SP 5 White metal blast cleaning (NACE No. 1) is to be used to clean unpainted or painted steel surfaces prior to applying high performance protective .
SSPC-Vis provides color photographs for the various grades of surface preparation as a function of the initial condition of the steel. Coatings tend to pull away from sharp edges and projections, leaving little or no coating to protect the underlying steel.
Other features that are difficult to properly cover and protect include crevices, weld porosities, laminations, etc. The high cost of the methods to remedy surface imperfections requires weighing the benefits of edge rounding, weld spatter removal, etc. Poorly adhering contaminants, such as weld slag residues, loose weld spatter, and some minor surface laminations may be removed during the blast cleaning operation.
SSPC-SP5.pdf - SSPC-SP 5/NACE NO 1 September 1 2000 Joint...
Other surface defects steel laminations, weld porosities, or deep corrosion pits may not be evident until the surface preparation has been completed. Proper planning for such surface repair work is essential because the timing of the repairs may occur before, during, or after the blast cleaning operation.
These soluble salts can be present on the steel surface prior to blast cleaning as a result of atmospheric contamination.
In addition, contaminants can be deposited on the steel surface during blast cleaning if the abrasive is contaminated. Therefore, rust-back can be minimized by removing these salts from the steel surface and eliminating sources of recontamination during and after blast cleaning. The time interval between blast cleaning and rust-back varies greatly from one environment to another.
Under mild ambient conditions, if chemical contamination is not present see Paragraph A6 , it is best to blast clean and coat a surface on the same day. Severe conditions may require a more expedient coating application to avoid contamination from fallout.
Chemical contamination should be removed prior to coating see Paragraph A6. It is, therefore, recommended that the temperature of the steel surface be at least 3 C 5 F above the dew point during dry blast cleaning operations. It is advisable to visually inspect for moisture and periodically check the surface temperature and dew point during blast cleaning operations and to avoid the application of coating over a damp surface.
Clean water should be used for rinsing. It may be necessary to add inhibitors to the water or apply them to the surface immediately after blast cleaning to temporarily prevent rust formation.
The use of inhibitors or the application of coating over slight discoloration should be in accordance with the requirements of the coating manufacturer. The dry-film thickness of the coating above the peaks of the profile should equal the thickness known to be needed for the desired protection. If the dry-film thickness over the peaks is inadequate, premature rust-through or failure will occur.
Therefore, it is often better than other blast cleaning as it requires higher standards of a clean surface.
Please note random staining, light shadows, discoloration are not allowed to remain on the surface. White metal blast cleaning is also used when immersion service requires the highest level of 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. The coating specification also might call for chloride testing to ensure deposited soluble salts are not higher the permissible limit.
Environmental Conditions needed for SSPC-SP 5 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. The sandblasting process should not be done if the surface temperature is less than 5-degree Fahrenheit or 3-degree Celsius above the dew point.
The dew point is the temperature that condensation starts. Besides, all conditions mentioned in the coating specification documents must be met. The procurement documents are part of the contract and have established requirements that must be met per project.
White metal blast cleaning can be done by dry abrasive blasting in the following ways: Using compressed air, blast nozzles, or an abrasive Using a closed-cycle, recirculating system with compressed air, blast nozzle, and an abrasive, with or without vacuum for recovery of abrasives and dust.
Large particle sized abrasives particularly metal- blast cleaning are listed below. Accordingly, Subject Commentary Section it is recommended that the use of larger abrasives be avoided in these cases. However, larger abrasives may be Abrasive Selection If control of profile Wet Abrasive Blast Cleaning Typical profile heights Surface Profile It should be used when a high degree of blast for Abrasive Blast Cleaned Steel provides color cleaning is required. The primary functions of blast photographs for the various grades of surface preparation cleaning before coating are: a to remove material from as a function of the initial condition of the steel.
The series the surface that can cause early failure of the coating A-SP 10, B-SP 10, C-SP 10 and D-SP 10 photographs system and b to obtain a suitable surface roughness and depict surfaces cleaned to a near-white blast grade. Other to enhance the adhesion of the new coating system. Coatings tend to pull away from sharp edges and A. It is important to projections, leaving little or no coating to protect the under- tion should be removed prior to coating see Section A.
Other features that are difficult to properly cover and protect include crevices, weld porosities,A. The high cost of the methods to remedy colder than the dew point of the surrounding air. It is, surface imperfections requires weighing the benefits of therefore, recommended that the temperature of the steel edge round- ing, weld spatter removal, etc. It is advisable to visually Poorly adhering contaminants, such as weld slag resi- inspect for moisture and periodically check the surface dues, loose weld spatter, and some minor surface lamina- temperature and dew point during blast cleaning tions may be removed during the blast cleaning operation.
Therefore, proper plan- A. Clean water timing of the repairs may occur before, during, or after the should be used for rinsing.
NACE No. 1/SSPC-SP 5-2006-SG, White Metal Blast Cleaning
It may be necessary that blast cleaning operation. Section 4. These coating be applied after blast cleaning to adequately cover soluble salts can be present on the steel surface prior to the peaks of the surface profile.
The dry film thickness of blast cleaning as a result of atmospheric contamination. In the coating above the peaks of the profile should equal addition, contaminants can be deposited on the steel the thickness known to be needed for the desired surface during blast cleaning if the abrasive is contami- protection.Unperfected surfaces may lead to premature paint failure. NACE and SSPC assume no responsibility for the interpretation or use of this standard by other parties and accept responsibility for only those official interpretations issued by NACE or SSPC in accordance with their governing procedures and policies which preclude the issuance of interpretations by individual volunteers.
NACE No. 1/SSPC-SP 5-2006, White Metal Blast Cleaning
NOTE: The presence abrasive system with compressed air, blast nozzle, and of toxic metals in the abrasives or paint being removed abrasive, with or without vacuum for dust and abrasive may place restrictions on the methods of cleaning recovery. Related Papers.
If the entire structure is to be prepared, this degree of cleaning applies to percent of the entire 8 structure.
Procedures Following Blast Cleaning and 5. It should be used when a high degree of blast for Abrasive Blast Cleaned Steel provides color cleaning is required.
Brush-off WAB cleaning allows all tightly adherent paint, mill scale, and rust to remain on the surface. The high cost of the methods to remedy surface imperfections requires weighing the benefits of edge rounding, weld spatter removal, etc. Its acceptance does not in any respect preclude anyone, having adopted the standard or not, from manufacturing, marketing, downloading, or using products, processes, or procedures not in conformance with this standard.
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