The primary measuring device for most types of paint

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The primary measuring device for most types of paint should be the wet-film thickness gauge used during actu- al painting, with proper correlation to the percent volume of solids in the paint being applied. When magnetic instruments are used as a check on the dry film, SSPC-PA2 should be used for the dry-film thickness measure- ment. What frequency of paint film thickness inspection is appropriate ? A sampling plan is defined in SSPC-A2 on the basis of the square footage of the structure being painted, which is useful for field painting applications. For sampling in shop painting applications, AISC recommends that 2 members be tested in every 25 tons or each shop layout of pieces to be painted. Any deficiencies in paint thick- ness or other specification requirements must be called to the attention of the fabricator by the owner/inspector at the time of completion of painting. Is a thicker paint film thickness than required acceptable ? Yes. Because the specified paint thickness is usually a minimum requirement, greater thickness is permitted if it does not cause excessive mud cracking, runs, sags, or other defects of appearance or function. Surface Preparation Requirements What surface preparation should be specified for steel that is to remain unpainted ? Steel that is to remain unpainted need only be cleaned of heavy deposits of oil and grease by appropriate means after fabrication. If other considerations dictate more stringent cleaning requirements, an SSPC-SP2 or other appropriate grade of cleaning should be specified in the contract documents. What level of surface preparation is specified for painted surfaces in the AISC Code of Standard Practice ? As indicated in the 2000 AISC Code of Standard Practice Section 6.5.2, in the absence of other requirements in the contract documents, the fabricator hand cleans the steel of loose rust, loose mill scale, dirt, and other for- eign matter, prior to painting, by means of wire brushing or by other methods elected by the fabricator, to meet the requirements of SSPC-SP2 (hand tool cleaning). Is it permissible for a fabricator to perform surface preparation beyond that called for in the contract documents ? Yes, unless prohibited in the contract documents. What degree of cleaning is implied when surfaces are indicated to be "blast cleaned" ? When blast-cleaned surfaces are specified in contract documents without identification of the desired degree of cleaning, SSPC-SP6 (commercial blast cleaning) is assumed. Where are surface cleaning requirements defined ? The acceptance criteria for the degree of preparation are specified in SSPC-VIS-1, The Pictorial Surface Preparation Standards for Painting Steel Surfaces, for all SSPC surface preparation levels (SP1 through SP10).
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APPENDIX PAGE 20 How is the blast profile inspected ?
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  • Structural steel

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