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This paper presents case histories on two commercial projects that incorporated industrial surface preparation, application and quality control standards and procedures into the work plans to achieve successful results. Highlights of SSPC audits for QP-8 and QP-9 recertification on the projects will also be discussed.
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Financial resources for maintenance of coatings systems for owners of steel bridges are at a premium. Therefore, it is imperative to prioritize and choose the scope of services for maintenance painting of these structures in the most efficient manner. This paper will present the fundamental steps necessary for a detailed condition assessment of the existing coatings of steel bridges.
Inspection of coating applications is more efficient and effective by the use of electronic equipment, which can store, transmit, and populate inspection reports with data. Field collection of inspection data points by manual note taking is being replaced with instruments that can capture and record metal thickness, coating film thickness, surface profile depth, surface contamination, environmental conditions, gloss levels of coatings, and adhesive pull-off strength of coatings. Electronic collection of data produces more accurately and statistically complete information than manual collection.
In the application of coating / lining systems, applied film thickness is an important aspect in the execution of the project. Specifications call for a required minimum film build, not to verify material use, but because it relates to the overall performance of the project. Knowing the applied film thickness of the coating / lining system as the job proceeds also helps determine if one has obtained sufficient material to successfully complete the application work as specified.
HISTORICAL DOCUMENT. Test method for evaluating the application of polymeric coatings of less than 250 µm (10 mils) dry-film thickness to the internal surfaces of metallic tubular goods used in the oil and gas industry.
High-solids, two-component acrylic polyurethane coating formulations were prepared using a new low-viscosity, reactive diluent that incorporates directly into the final polymer network. The resulting acrylic coatings were found to increase the solids content of formulations without compromising mechanical performance. Acrylic polyurethane coating samples containing the diluent were evaluated for weatherability performance via QUV and environmental chamber studies.
This paper discusses the revision of SSPC-PA 9, “Measurement of Dry Coating Thickness Using Ultrasonic Gages.” This standard describes procedures to measure the thickness of dry, homogeneous coatings applied to concrete, wood, wallboard, plastic, fiber and composite material using commercially available ultrasonic coating thickness gages.