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Thick-film elastomeric coating / lining systems have excellent performance characteristics in a variety of potable water lining work, including the polyurea spray elastomer technology. While some have cast doubt on the suitability of a polyurea system for immersion applications, there are a variety of commercial products with the NSF/ASNI-61 certification for potable water use that are performing quite well.
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Epoxy coatings have a long and successful track record in marine and protective coatings, due to the combined offerings of excellent corrosion and chemical resistance. As regional environmental drivers become firmly established, the industry is faced with the constant challenge of providing solutions which can comply with emerging VOC regulations. There is a continuous trend to move the technology from the so-called conventional paint to high solids coatings, and more recently, to ultra-high solids coatings [1]. At the same time the overall performance attributes associated with high performance epoxy systems need to be either maintained or improved depending on specific industrial application needs. Many current high solids epoxy systems use non-reactive plasticizers such as benzyl alcohol or alkyl phenols to enable full chemical conversion of the polymer matrix. While this approach allows for reduced solvent demand, such products do not always address the market need for extended service life. The use of fugitive plasticizers can cause the coating to lose its flexibility over time as the plasticizer leaches out. In order to address this, a different plasticization approach to lower solvent requirement and ensure complete cure is needed. This paper will review the basics of high solids epoxy coatings compared to conventional epoxy technologies and describe the fundamental technical differences. It will also present new versatile amine curing agent technology that offers solutions to develop coatings compliant with stringent emission test accreditation, and at the same time, addresses many of the technical challenges associated with high solids systems. Furthermore, the absence of nonreactive plasticizers facilitates long-term conservation of the mechanical properties of the coating, and hence, helps deliver long-term asset protection.
Coating thickness is one of the most important parameters influencing durability of a protective coating system. As a general rule-of-thumb, the thicker the coating, the greater the protection. But is there any upper limit to this general rule? This paper looks at durability figures of common protective coating systems for atmospheric and immersion exposure as a function of dry film thickness.
Neptune Bulk Terminals in Vancouver, British Columbia needed to re-coat two of its ocean-going Potash Ship Loader conveyors within a 27-day window to prevent interruption of international ship loading schedules. The contractor elected to use ultra high pressure water jetting (UHPWJ) for the steel surface preparation rather than the sand blast medium used on the previous loader conveyors. This required innovative desiccant dehumidification equipment to facilitate rapid drying of the steel upon completion of the UHPWJ work due to an increased moisture load.
Since ductile iron (DI) pipes generally cannot be galvanized, inorganic zinc (IOZ) coatings can be considered to provide sacrificial corrosion protection in harsh atmospheric exposures, such as marine environments. The unique application of IOZ coating system provides an excellent cost-effective, long-term protection of atmospherically exposed DI pipes.
The 2014 US bridge inventory lists over 610,000 highway bridges. Industry experts believe that the cost of maintaining those bridges for repairs due to corrosion is at least $30 billion annually. Bridge owners do not have the resources to maintain bridges in good condition. New bridges are being constructed, at the rate of approximately 3,000 nationally each year. Those new bridges must not pose additional maintenance burdens on the already inadequate bridge maintenance budgets.
The Bureau of Reclamation (USBR) is currently investigating the feasibility of using foul-release coatings to mitigate impacts caused by macro-fouling organisms such as zebra and quagga mussels. Durability of these coatings must be considered as a factor in determining overall life cycle costs. To this end, the Bureau of Reclamation has developed testing protocols to evaluate the durability of foul-release coatings with respect to abrasion, erosion resistance and the ability to overcoat existing equipment.
A two-year FHWA in-house study was launched in November 2006 to evaluate various coating materials that can be applied as one-coat systems to steel bridges. A total of eight test materials plus a 3-coat system and a 2-coat control system were applied over near-white steel test panels (SSPC-SP10). Their performance is being monitored using electrochemical impedance spectroscopy, various surface failures, rust creepage at scribe, adhesion, and change of color and gloss.
The fundamental purpose of protective coatings and linings has always been the protection of structures from the degradation due to environmental and service conditions. While that remains to be the case, coatings are increasingly evaluated on their environmental, health, and safety effects as well as the various operational efficiencies they offer.
A cost versus performance study on the role of thermoplastic liners (TPL) in controlling costs associated with the protection of downhole oil and gas production tubulars from internal wear and corrosion.
There is a wide gulf in the industry between the capabilities of water jetting and wet abrasive blast equipment capabilities and the perception of their capabilities. The misinformation frequently leads to miscommunication between the various parties involved in projects where the equipment and associated standards are used.