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The use of climate control is commonly perceived as an additional cost and the energy consumed is often substantial. A closer look at the real impact can uncover economic and environmental benefits that may offset and even exceed the initial costs. These benefits include life cycle costs of the coating system, efficiencies in the project sequencing and minimizing coating and solvent waste
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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.
The most commonly accepted way to protect structural steel on bridges is with liquid applied coatings (paint). The current life expectancy for field-applied protective coatings (maintenance painting) is about 20 years in snow/ice and marine areas. Most bridge owners use a remove-and replace strategy for maintenance painting, with unit costs usually in excess of $10.00 per ft. The cost of maintaining a protective coating during the service life of a bridge may approach the bridge’s original construction costs.
During the construction of a 56km long 16 in. carbon steel sour gas pipeline, repetitive surfacepreparation failures were detected during visual inspection of pipeline girth weld internal surface prior tocoating application. Such failures represented 67% of the total pipeline girth welds and were manifestedby excessive sharp-edges at the root pass. To identify the failure causes, an investigation wasperformed through reviewing the pipeline, fabrication and coating application specifications andprocedures, quality control records and performing an extensive visual inspection through an advancedvideo robotic crawler on all pipeline girth welds made. Upon investigation analysis, the failures werecaused by sharp-edges in the root pass which were attributed to improper practices duringmanufacturing, field fabrication and pre-coating quality control. The failure analysis indicated that themechanized Gas Metal Arc Welding process, with the parameters used, was not suitable for internalgirth weld coating application. In addition, a more stringent requirement should be applied to theacceptable pipe-end diameter tolerance and pre-coating quality control to ensure absence of similarpremature surface preparation failures. The pre-coating quality control can be improved throughutilization of robotic laser contour mapping crawler for precise detection and sizing of unsatisfactorysurface weldment defects, including sharp edges.
Fiber-Reinforced Polymers (FRP) materials are used to rehabilitate and strengthen structures systems and components including but not limited to concrete bridges, columns, marine piers, metallic and concrete pipes, metallic and concrete piles, parking garages, and even storage tanks structures. The growing appeal of this rehabilitation process consists of two primary purposes; to increase shear and load capacity and repair and prevent corrosion degradation.
The practice of induced heat to decontaminate a tank (pre-baking) that has been in previous service for re-lining and / or the post application heat curing (force curing) of an applied lining may be considered as a lost art known currently to the few lining specialist within the industry. The objective of the presentation is to inform or remind Owners, Specifiers, Inspectors, Applicators and Vendor Representatives of the requirements and benefits of these processes to obtain a successful relining or tank lining project and additionally attain time savings and prevent cold curing issues.
A new water-soluble quaternary ammonium compound, didecyldimethylammonium bicarbonate/carbonate (DDABC), has been evaluated as a corrosion inhibitor via standard electrochemical tests on steel and shown to be highly effective. At the proper dilution, the inhibitor migrates to the metal/solution interface and forms a monomolecular film on the anodic sites.
This paper explores the process of repairing and preparing concrete substrates for application of protective sealers, coatings, or linings. It will present the road map, provided in SSPC SP 13 / NACE 6, “Surface Preparation of Concrete” to attain long term barrier protection performance. It will present the means and methods to achieve a concrete surface suitable for sealer, coating, or lining application.
Life safety is the mantra of National Fire Protection Association (NFPA) 101 which is embraced by all in the fire protection industry. The approach to life safety has disseminated now into steel protection. Hot dipped galvanized members are being used more frequently in commercial buildings which require hourly ratings for fire protection.
A new method within surface preparation, setting new standards within an industry struggling to keep up with increased Health, safety and environmental issues.
An in-depth look at alternative “green” methods of surface preparation when traditional abrasive blasting of exterior steel substrates is either impractical, costly, or there is an inherent desire to minimize environmental impact, dust generation, and contaminant release, such as solvents or lead.
This paper will explore High-Performance Concrete Floor Coatings. It will include the basic characteristics of concrete as a floor substrate. We will examine the importance of preliminary inspection and surface preparation. We will discuss the basic generic types of coatings available and the selection of the appropriate system. We will conclude with an overview of the proper application of the coatings.