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Geothermal energy is an excellent source of renewable clean power generation, as well as for heating and cooling. Unlike other renewable energy sources, it is unaffected by local climate conditions. However, the heat exchangers used in geothermal power plants are under constant threat of scale formation and corrosion due to the harsh operational conditions to which they are exposed. Therefore, surface modifications to heat exchanger materials, for example through coatings, are necessary to improving the efficiency and durability of geothermal plant.v
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The control, mitigation and prevention of corrosion in environments ranging from mildly corrosive to severe atmospheric conditions to underground exposures (such as pipelines) to chemical spill and fume exposures has long been focused on the use of thermosetting polymers such as epoxies, polyesters, vinyl esters and urethanes. For the most part these materials have worked reasonably well in applications such as structural steel and equipment coatings, architectural paints, vessel linings, concrete coatings, secondary containment linings, and floor toppings.
The demands of cementitious coatings and repair mortars have never been greater. As manufacturers, contractors, and coatings inspectors we are tasked with providing high performance solutions for new projects, or to breathe life back into failing concrete or steel. With new cement technologies, we can meet and exceed our customers’ environmental and financial expectations.
Fluoroethylene-vinyl ether (FEVE) resins were developed in the early 1980’s. These thermoset solution fluoropolymer resins are used to make highly durable, weatherable, and corrosion resistant air-dry coatings. Applications are found in architectural, industrial, automotive, and aerospace markets, and in infrastructure coatings for bridges, oil rigs, and water towers.
The coatings industry is very familiar with shot/grit blasting as a mechanical means of surface preparation. Over the years, operators have worked with manual and automatic blast equipment with its associated dust collection arrangements. As with every manufacturing process, operating costs are very critical in this highly competitive industry. Therefore, coaters are always on the lookout for ways to tune their process and increase productivity.
The coatings industry is very familiar with shot/grit blasting as a mechanical means of surface preparation. Over the years, operators have worked with manual and automatic blast equipment with its associated dust collection arrangements. The industry is highly competitive, and control on operating costs is critical. Therefore, coaters are always on the lookout for ways to tune their process by lowering costs and increasing productivity.
Insulative coatings are prompting significant interest with increasing environmental and safety awareness and sensitivity to energy efficiency. Aerogels are the best thermal insulators in the world. Cabot’s aerogel has a thermal conductivity of 12mW/m-K (compared to still air or PU foam at 26mW/m-K) and is currently being used extensively in day lighting and oil & gas applications.
This paper will discuss utilizing temporary dehumidification and climate control equipment to reduce corrosion levels during the installation of coatings and linings applications; the science of Psychrometrics, the science behind dehumidification, and discuss how the components interact on a coatings project.
Model building codes and standards have begun adopting new energy efficiency requirements for building envelopes, including more quantifiable assessment of the air permeance characteristics of the materials and assemblies used in the building envelope. This research effort was initiated to understand and quantify the air leakage mechanisms of single wythe concrete masonry construction, which is commonly used in exterior building envelopes.
Corrosion can seriously damage the substrate and can lead to significant repair or replacement costs. Good corrosion protection for metal coatings is traditionally achieved through two component (2K) systems. However, they show certain disadvantages that do not exist for one component (1K) systems.
Recent polyurea resin technology advances have allowed for the development of value-added polyurea topcoats that are proving to be valuable alternatives for many polyurethane applications. The development of an SSPC specification for a weatherable polyurea topcoat is discussed for the purpose of providing a standard that will be acceptable throughout our industry.
Recently, the advantages of thick film coatings and linings have led to uses in many different applications in the industrial, commercial and automotive markets. Although this polyurethane and polyurea materials have excellent physical properties, they are based on aromatic chemistry which is susceptible to damage from UV radiation and is not light stable.