SSPC SP16 Brush-Off Blast Cleaning
When performing brush-off blast cleaning of soft metals such as aluminum, copper, and brass, care should be taken to avoid erosion of the metal substrate. You can produce one without the other.
Acceptable spot measurements are defined by the minimum and maximum values in the contract documents. Unpredictable circumstances may negate the usefulness of this standard in specific instances. The standard also provides requirements for random staining on the surface which shall not exceed five percent of each unit area of surface.
The number of peaks and valleys is also important. These features can be grouped into the categories of blast cleaning methods, blast cleaning abrasives, c objective questions and answers pdf free and procedures following blast cleaning. Together we can come to a right answer. Comply with all applicable regulations.
Unperfected surfaces may lead to premature paint failure. Substrates that may be prepared by this method include, but are not limited to, galvanized surfaces, stainless steel, copper, aluminum, and brass. Therefore, it is important for the specifier to indicate an acceptable range for each coating layer, as the coating may not perform at the lower thickness. You are purchasing a downloadable pdf of this Standard.
The force necessary to pull the magnet from the surface is measured and converted to coating thickness, which is displayed on a scale on the gage. Measurements to Determine Conformance to a Specification. In order to select an appropriate abrasive, the type, grade, and surface condition of the steel need to be considered.
Newly exposed zinc surfaces will oxidize rapidly, especially in the presence of moisture. Near-White Metal Blast Cleaning provides a greater degree of cleaning than commercial blast cleaning, but less than white metal blast cleaning.
The dew point is the temperature that condensation starts. The abrasives selected for this method depend on a variety of factors.
Adding a recirculating closed-cycle abrasive system with compressed air, blast nozzle and abrasive with dry abrasive blasting. The air compressor alsoo should be checked for oil and water contamination by Blotter Test. Most sheet metal and coil stock used to fabricate decking and curtain wall receives chromating treatments.
If present, intact tightly adherent coating shall be roughened as specifed in the procurement documents project specifcation. That is, no allowance is made for variant spot measurements e. Additional infor- immediately after wet blast cleaning is contained in mation on surface imperfections is contained in Section A.
It should be used when a high degree of blast for Abrasive Blast Cleaned Steel provides color cleaning is required. However, metals with an existing profile acceptable for painting can be cleaned with waterjetting to expose the existing profile. This procedure also verifies that the probe configuration will accommodate the edge configuration prior to coating thickness data acquisition. Surface preparation using this standard is used to uniformly roughen and clean the bare substrate and to roughen the surface of intact coatings on these metals prior to coating application. Embedment can be detrimental for example, ferrous metallic abrasives on stainless steel or aluminum.
Acquisition of more than three gage readings within a spot is permitted. Examples of techniques that may reduce the risk of erosion include the use of softer abrasives, lower nozzle pressures, and increased stand-off distances. Near-white metal blast cleaning is to be used to clean unpainted or painted steel surfaces prior to applying a new protective coating or lining systems.
The standard lists dry abrasive blasting as the preferred method with wet blasting an option to be agreed upon between the two parties. In these cases, the cleaning shall be performed cleaned steel is exposed to moisture, contamination, or a across the entire area specified.
Addi- settlement procedure is established, then a procedure mu- tional information on abrasive selection is given in Section tually agreeable to purchaser and supplier shall be used. In addition, all conditions mentioned in the coating specification must be met for near-white blast cleaning.
If all three areas turn black immediately, there is no passivation on the surface. We will be updating and growing this site with more and more of industrial inspection related articles. The Society for Protective Coatings standard represents a consensus of those individual members who have reviewed this document, its scope, and provisions.
SP 10/NACE No. 2 Near-White Blast Cleaning
The standard also contains unique procedures for use on galvanized steel including inspection for a passivation treatment and wet storage stain. All of the area within five feet of any non-compliant spot measurement is considered non-compliant. Anyone making use of this information assumes all liability arising from such use. Harder abrasives are typically required for stainless steel.
Wet storage stain is the whitish zinc corrosion product that forms when galvanized parts are exposed to moist air without suffcient air circulation between the parts. Other features that are diffcult to properly cover and protect include crevices, weld porosities, laminations, etc.
Within each area, five randomly spaced spots are selected. Intended primarily for carbon steel, but applicable on other metals, waterjetting does not create a profile on the metal substrate.
Moisture condenses on any surface that is laminations, etc. Verification of Accuracy using Certified Standards. It is intended to aid the manufacturer, the consumer, and the general public. Therefore, proper plan- A. Surface imperfec- tions can cleaning.
The chosen method shall comply with all applicable regulations. Neither is this standard or lining specifiers, applicators, inspectors, or others whose intended to apply in all cases relating to the subject. By javier eduardo morales. Gage Calibration, Accuracy Verification and Adjustment. It depicts an approximate square foot area containing gage readings and spot measurements.
It is also important to note that both documents address the measurement of coating thickness on both ferrous and non-ferrous metal substrates. Non-compliant areas are demarcated using removable chalk or another specified marking material and documented. The size and hard- ness of abrasive media selected for brush-off blasting of non- ferrous metal substrates should be based on surface profle requirements. First, once the surface is coated e.
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