Wastewater treatment plant clarifier environments present challenges for selecting materials of construction. Coated carbon steel, hot-dip galvanized steel, and stainless steel are most commonly specified for new or refurbished clarifier mechanisms, and all have their advantages and disadvantages with regard to achieving the intended design life.
As the use of alternative deck building products gains increased momentum, the need for protecting a deck’s surface remains crucial and becomes more complex. Composites and hardwoods have characteristics different from those of traditional pressure treated wood or cedar; and methods of coating and protecting these surfaces are different from traditional treated wood, yet also essential.
Concrete is an inherently attractive building material. It expresses the natural appeal of stone by its mass and permanence. With the addition of natural looking color variations, concrete as stone, is even more realistic. Concrete stains are an excellent choice for producing colors often found in earth and rock. When combined with simple and creative application techniques, stains allow for truly unique concrete installations, which complement a variety of hardscape and flooring designs.
Coatings are widely used for highway steel bridges exposed to aggressive environments to extend their service life. Even with the continuous development of coating technologies, steel bridges remain susceptible to corrosion deterioration. Periodic maintenance, that may include coating repair, is required for long term bridge serviceability. Selection of compatible repair coating materials and appropriate preparation of the steel surface are critical parameters for corrosion protection.
Pond investigated pressure vessel tank failures which are causing recurring maintenance of $250,000 per year. This challenging project had limitations of space, operational time pressures/vessel availability requirements, cost and replacement variables. This presentation will chronical problems and discuss best practices of specifications, material selection, surface preparation, and application inspection that would have prevented the aforementioned outcome. This paper discusses the fundamentals of composite coatings, industry accepted design standards for their use, and examples of typical uses for these materials that solve problems in varied industries.
Currently the shipbuilding industry is seeking to minimize to improve corrosion protection provided to the structures which comprise the Water Ballast Tanks (WBT’s) of a vessel. At the design stage two factors could reduce the carbon footprint of the coating process through life material selection and optimizing the structural design to facilitate the coating process and maintenance processes. Thus, the design stage exerts considerable influence on these two elements and can determine the through life costs and environmental penalties of maintaining the structure.
After 35 years or longer in service, the concrete infrastructure in wastewater collection systems and treatment plants has deteriorated due to various corrosion and physical degradation mechanisms. This paper reviews the major mechanisms that cause deterioration of concrete and protective coatings. Also, examples of infrastructure degradation are presented along with a discussion of the best diagnostic methods for condition assessment of concrete for the various mechanisms.
Surface conditioning is the first step in building efficient corrosion protection on a part or structure. Key concerns during this step include, how to create a stronger anchor-profile and how to efficiently remove previously coated, damaged, or corroded elements from a materials surface prior to coating. The ideal solution must consider three areas of the surface conditioning process: finish quality, cleaning efficiency and total cost.
This paper presents an overview of systems available in the market today, their health and safety characteristics, performance capabilities and delivery mechanisms. Installation technologies are analyzed on their energy efficiencies, environmental impact, performance result consistency, ease of use and cost. The goal was to identify currently available systems; analyze concerns and limitations with these systems; and provide a basis for material selection and installation practices to achieve long-term expectations; while maintaining the utmost protection of humans, animals and the environment
The authors look toward the future of specifying coating projects starting with the traditional prescriptive, means-and-methods, coating formula-based specifications. The popular qualified product list (QPL) approach is presented along with its drawbacks. The design/build (DB) ideal and limitations of specifying only performance is presented.
At the project phase, the main responsibility of a corrosion engineer is to develop Corrosion Management Program (CMP) and establish a corrosion control strategy for specific individual units. A well-designed Corrosion Management Program is the most useful material not only to prepare a corrosion control strategy, create a reliable inspection plan but also to promote corrosion knowledge management, corrosion talent development and training, integration with other disciplines such as process, operation, inspection, maintenance.
The Hydroprocessing unit is the crucial process of the refinery as high temperature and high-pressure operation conditions are in which major catastrophic accident occurs. An understanding of variables influencing corrosion in hydroprocessing units is necessary for corrosion engineers to improve the reliability, safety and environment impact associated with them. This paper describes an example of how Corrosion Management Program (CMP) and Integrity Operating Windows (IOW) are used for developing specific corrosion control strategy, corrosion knowledge sharing and integration with other disciplines to prepare customized corrosion control strategy of hydroprocessing unit in JAZAN project. The development of corrosion management strategy of Hydroprocessing is focused on the Reactor Effluent Air Cooler system corrosion control using a water-washing method.