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The Federal Highway Administration has a top-level technology goal targeted toward the development and deployment of the “Bridge of the Future.” This is a conceptual short span bridge that demonstrates significant improvements over the current state of the practice – particularly with regard to ease and speed of construction and long-term durability.
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Erosion-corrosion plays an important role in determining the durability of the erosive/corrosive slurry handling equipment. The combined action of erosion and corrosion produces a high degradation rate. Material loss rate due to erosion-corrosion is usually significantly higher than the sum of material loss rate due to pure erosion and pure corrosion acting separately. The degradation in erosion-corrosion is primarily by matrix extrusion due to abrasive particle impact.
Implementation of classification and certification programs for durable industrial and infrastructure maintenance coating systems is hindered by a lack of test protocols to reliably accelerate the aging process and estimate service lifetime. This gap in the industry also hurts development efforts toreformulate or add new color choices to existing product lines. The first problem can be addressed by performing long-term weathering testing at outdoor exposure sites in places like south Florida and Arizona, but the need to wait 5 or 10 years or longer to confirm a classification or certify a product makes such schemes difficult to implement and ultimately reduces their value.
Boiler system is one of the most critical systems for a utility plant. A utility plant had experienced high percentages of boiler downtime owing to boiler tube sheet cracking failures. Investigations carried out revealed high stress at the tube-to-tube sheet joint in the boiler fire-side entrance. Tube-to-tube sheet joints at the boiler fire-side entrance had been fabricated by strength welding and without any expansion. The strength welded joint had created undue stress leading to cracking of the weld joint by thermal expansion. A higher quality expanded joint consisting of expanding, flaring and seal welding the fire-side entrance was implemented during the re-tube process. The utility plant has now zero downtime due to boiler tube failure. This article summarizes the description and history of failures with the boiler at the utility plant; investigations and corrective actions carried out; and the present improved condition of the boilers.
Powder metallurgy with hot isostatic pressing (PM-HIP), which enables to densify powders in a furnace at high pressure and temperature is a newly developed manufacturing process for pressure retaining part in nuclear industry. It has advantages such as weld free near-net shape products, improved material properties for castings, short process time, saving in raw material costs, etc. EPRI have conducted several tests such as tensile test, impact test, chemical composition analysis on the manufactured samples for pressure retaining applications.
Oil and gas wells represent a large capital investment. It is imperative that corrosion of well casings be controlled to prevent loss of oil and gas, environmental damage, and personnel hazards, and in order to ensure economical depletion of oil and gas reserve. Wells placed in external corrosive environment shall be protected by appropriate barriers such as additional cemented casing, cathodic protection and coating to assure well casing integrity.
Restoration of steel and concrete surfaces has relied heavily on sandblasting and other dry blasting techniques. For over a century, dry blasting has been an effective, but dusty approach in removing coatings, contaminants, corrosion, and residues, with emissions of silica and other abrasive or substrate particles linked to negative health and environmental impacts.
With more stringent silica regulations being enforced, wet abrasive blasting is becoming more prevalent in the industry. We investigated the viability of wet abrasive blasting as compared to the more commonly used dry abrasive blast. One added benefit of wet abrasive blasting is the removal of soluble salts in addition to providing the specified profile.
Coatings are integral to a corrosion prevention strategy, especially with a multilayered system and cathodic protection. While these systems have redundancies and are designed with extended lifetimes, it is important to understand how each part of the system performs under stress. There are many coating chemistries out there for corrosion prevention, such as liquid epoxies and polyurethanes, but Fusion Bonded Epoxy systems have many favorable properties for scenarios that require the most cost-effective, resilient solution.