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The paper chronicles and discusses the challenges, options, choices and solutions from the design phase through the actual blast cleaning and painting of one of the most unique steel structures in the world, the largest radio telescope at Arecibo, Puerto Rico.
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Well-formulated fluorocarbon paints can last for decades, but when repair is needed or a color change is desired, it can sometimes be a challenge to choose the right coating system to use on top of the fluorocarbon. This presentation will discuss new VOC-compliant options that have become available which not only stick to fluorocarbon paints, but also offer a quantum improvement in color fade resistance.
Recent advances in the realm of polyaspartic ester finish coat technology have led to significant improvements in their aesthetic and corrosion resistance properties. Of particular interest is an initial comparison of the aesthetic properties of older and new generation polyaspartic ester finishes with both polyurethanes and isocyanate-free polysiloxane finishes.
Polyaspartic coatings can offer excellent performance characteristics typically expected of SSPC Specification Number 36, Level 3, for Aliphatic Polyurethane Topcoats. In addition, polyaspartates will pass an industry standard for corrosion protection in medium corrosivity environments direct to metal. These features offer the typical industrial maintenance customer high performance for gloss and color retention, while reducing application time and costs.
In the early 1900’s, a small community in the mountains of western Maryland, installed two potable water tanks that were open top and below grade. Over the years, they began leaking water into the basements of nearby residences, so several upgrades to the tanks were planned. The upgrades included the addition of metal dome roofs, electronic security systems with fencing, and a waterproof lining system. Contractors were invited to view the facility and bid the lining system while the tanks were still in service – first mistake
Application of conventional coatings directly to concrete tanks is a common practice for the primary containment of liquids. Substituting the application of polyurea geomembranes in lieu of conventional methods exhibits a significant reduction in application time with regard to certain surface rehabilitation, surface preparation, and priming of substrates. Polyurea geomembranes are high performance liners designed for various reasons that include, but are not limited to, protection of the environment from pollution and hazardous materials or protection of the lining’s contents from vessel contamination.
Although polyurea geomembranes have been successfully used in the market for several years, technical information and performance evaluations are virtually nonexistent. Furthermore, when referring to construction specifications for polyurea geomembranes, physical properties of the coating and geotextile are listed rather than those of the geomembrane. Polyurea geomembranes have unique properties, and they deserve the same comprehensive testing and reporting as the components used to form them.
Every year millions of dollars are spent litigating the responsibility issues associated with the repair or replacement of coated products that have prematurely lost their decorative or protective value due to improper coating specification or application. Many of these failures could have been avoided if the proper finishing materials and methods were specified, followed, certified and documented.
This paper will offer general guidance regarding preservation by liquid applied coatings to the owners and operators of coastal and inland working vessels. The paper will discuss both new construction and maintenance painting and will offer suggested coating systems for the main areas of these vessels.
On March 8, 1862 in Hampton Roads, Virginia the first iron clad vessel on the seas, the CSS Virginia (known to Northerners as the Merrimac), had its way with the navy of the Union. It was able to sail unmolested among the ships of the Union Navy and fire at will while taking hits itself with impunity. When dusk arrived the Virginia went to anchorage to wait for sunrise when it could inflict more damage.
Many industries are operating under severely limited O&M budgets and have been for some time. “Lean and mean” in today’s reality has become “mal-nourished and over stressed”. The last major corrosion study conducted in our industry showed a $276 Billion/Yr. deficit of which 75% was unrecoverable. Now a new study has determined that it is never too late to restore measurable viability to a facility's operation through adequate and proper preventive maintenance. This is good news, providing we can adequately demonstrate and use it.
Over the years, construction of telecommunication sites on municipal buildings and water storage facilities have become commonplace. Installations and upgrades of telecommunication sites, from the planning phase to activation, can extend over multiple years creating an unpredictable construction season. Careful planning with extreme ambient conditions on either side of the spectrum has become a standard in the industry.