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The San Mateo Bridge represents the largest application of thick film coatings for protection of a concrete highway bridge in the US to date. This challenging project was undertaken in order to provide a aggressive extension to the expected service life of the new concrete components of the widened bridge. This report provides a brief summary of the coating application process during construction followed by a report of a recent visual inspection performed at the five-year point in service.
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Recent US Navy and NSRP projects have explored alternative inspection techniques for evaluating flash rust on waterjetted surfaces. This paper will summarize investigations into new inspection techniques which have been performed over the past few years.
Hot-dip galvanizing is one of the most economical, maintenance-free corrosion protection systems available. Like any other manufacturing process, hot-dip galvanized steel requires an inspection of the finished product to ensure compliance with applicable specifications. In this presentation, we will discuss the inspection process completed at galvanizing facilities prior to final shipment.
During April 2010 through June 2010, tank repairs were performed at Defense Fuel Support Point (DFSP) in San Pedro, CA. A two-part Modified Epoxy Novolac Polysulfide Coating was applied to three (3) previously uncoated 50,000 barrel (Bbl) underground concrete storage tanks. The tanks have been in operation since 1942, storing various bunker and jet fuels. The scope included surface evaluation, surface preparation, concrete sealer application and coating application.
Cathodic protection (CP) is used to prevent external corrosion on underground pipelines. The effectiveness of CP is commonly evaluated by measuring the DC potential (voltage) of the pipeline with respect to a reference electrode located on the surface of the earth above the pipeline. Criteria used to interpret pipeline potential measurements are given by Section 6 of NACE SP-0169-2013 “Control of External Corrosion on Underground or Submerged Metallic Piping Systems.
The U.S. Air Force will never eliminate corrosion in aerospace systems, but synchronized efforts can help sustain positive trends in conserving maintenance dollars, increasing system availability, and reducing corrosion-related mishaps. The AF Corrosion Control and Prevention Executive established an aggressive goal to reduce corrosion’s effects by 20% by 2025: a 20% reduction in corrosion maintenance costs; a 20% reduction in non-available hours (NAH) due to corrosion repairs; and a 20% reduction in corrosion-related safety mishaps.
This article discusses how companies that are facing or that may face lawsuits arising out of the historical use of lead-based paint can preserve and maximize their rights to coverage under CGL policies. The article analyzes the key terms in standard-form CGL policies and their application to lead paint claims. The article also provides pointers regarding the practical steps that companies can take now to preserve their rights going forward.
Geothermal energy is a promising choice for alternative energy resources due to its reliability and low CO2 emissions. One way to harness this energy, is to extract hot fluid from a geothermal well. Geothermal fluids are a complex medium with different physical and chemical properties depending on the location and depth of a geothermal well. Thus, these fluids can be corrosive to the geothermal power plant depending on the corrosivity class. The geothermal power plant consists of various parts, such as pipelines and heat exchangers. For continuous power generation, this power plant should be safe and durable. Therefore, it is important to protect the infrastructure in this environment from corrosion.
When a metal or metal alloy is immersed in an electrolyte made of a conducting material of sufficient oxidizing power, such as moist soil, it will corrode according to a well-defined electrochemical mechanism. dc corrosion is a result of dissolution of material due to oxidizing reactions, liberating electrons and forming positive ions transported into the electrolyte, leading to material loss. The current-potential relationship governing this electrochemical process termed polarization, is non-linear. This relationship is often represented by a polarization curve, which is typically, an experimentally determined function. There are a number of parameters that can contribute to the final characteristics of the polarization curve within a system ranging from material parameters (e.g. material, geometry) to environmental factors (e.g. composition of the electrolyte).