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This paper investigates a key concern with Ultra High Pressure Waterjetting (UHPWJ) surface preparation – the impact of “flash rusting” on coating life. Flash rusting can occur under certain environmental conditions when the steel is left sufficiently wet following UHPWJ. Reducing or eliminating flash rusting can increase the cost of surface preparation. However, flash rust’s impact on coating life is debated.
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This presentation is designed to provide the details that must be considered when tackling the application of polyaspartic liquids, including crew training, crew personnel selection, work area organization, environmental conditions, application techniques and unique applications.
A large copper mine and refinery in the western United States had a dilemma. Their cell house, which contains over 1,500 cells, each holding more than 20,000 gallons of electrolyte, had experienced severe corrosion and structural degradation of the support columns for the tanks. These columns support the cells in their solvent extraction and electrowinning process.
When Marsden Point Oil Refinery in New Zealand needed to reline 3 steel crude oil storage tanks, the engineers began a search for a lining with the necessary properties to provide a long-term solution.
The paper will outline the following: 1. Process from when a customer approaches the polyurea supplier with a set of problems they need to overcome and the important issue of understanding what the customer and the job requirements really are. 2. How to evaluate and determine if the products you have available are suitable or not. 3. The process of having the customer write specifications based on what the applicator can realistically deliver and accomplish.
Polyurethane technologies have demonstrated their applications in a variety of seamless polymer flooring systems. Aliphatic polyurethanes are widely used as topcoats since they provide combinations of good color stability, gloss retention, abrasion resistance, chemical resistance, and weathering resistance. Recent development in polyaspartic chemistry offers more options in coating thickness, curing temperatures, and solids content.
Adit towers are generally vertical, large diameter concrete pipes that serve as vaults for valves used to drain and fill a reservoir. The tower runs from several feet above the waterline down through the reservoir and into the reservoir bed for some distance. Many of these towers and reservoirs are old and deteriorating, as the United States suffers from an aged infrastructure.
In the 1920's the Ford Motor Company commissioned architect Albert Kahn to design regional automobile assembly plants. The largest on the West Coast was built in Richmond CA. With over 500,000 square feet of floor space under one roof it is still today the largest single building on San Francisco Bay. During the 1989 Loma Prieta earthquake this National Historic Building was severely damaged to the point that it could not be occupied. This paper tells the tale of how due to incredible time restraints an Olympian effort was needed to retrofit and restore this national treasure to a usable commercial building.
The use of temporary humidity control assisted in the recovery of multi-family housing structures in New Orleans after the city was ravaged by Hurricane Katrina. The process of temporary climate control during re-construction contributed to the overall quality control of moisture sensitive materials, predictable schedules, on-time completion and elimination of indoor air quality problems.
A two-year Federal Highway Administration (FHWA) in-house study was launched in November 2006 to evaluate various coating materials that may be applied as one-coat systems to steel bridges. A total of eight test materials plus two control systems, a 3-coat and a 2-coat, were applied over near-white steel test panels (SSPC-SP10). Their performance has been evaluated for 20 months using electrochemical impedance spectroscopy, surface failure characterizations, rust creepage at scribe, pull-off adhesion, and changes of color and gloss.
The acceptance of thick film coatings has grown significantly over the last few years. Different industries offer specific challenges. This presentation looks at the uses and contractor demand for thick film applications in the offshore oil industry.
Desiccant dehumidification technology has transformed itself into a sophisticated and mainstream method that is used in many blasting and coating applications today. Utilizing temporary dehumidification and remote monitoring equipment for a blast and coating operation for the Onslow Beach Bridge allowed the project to be completed in 30 days – twice as fast as is typical for the type of project. This paper also will discuss how a contractor realized significant fuel savings due to the use of energy-efficient equipment.