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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.
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Contractors who apply coatings as a water resistive and air barriers for a wall assembly will be more effective if they understand the basic building science principals behind bulk water intrusion in walls. Understanding the leak triangle and utilizing he Three ‘D’ approach – Deflect, Drain, Dry – will help the contractor be more effective in analyzing problems and recommending solutions.
In the application of coating / lining systems, applied film thickness is an important aspect in the execution of the project. Specifications call for a required minimum film build, not to verify material use, but because it relates to the overall performance of the project. Knowing the applied film thickness of the coating / lining system as the job proceeds also helps determine if one has obtained sufficient material to successfully complete the application work as specified.
Cleaning, restoration and conservation of murals and decorative paintings are three vastly different definitions. Murals get dirty over time. To wash them with a non-invasive cleanser is to “clean” them. You could clean a mural with de-ionized water or mild cleansers. Blowing the dust off with light compressed air, soft bristle brushing or chemical sponging is also considered cleaning. Once we step from a surface dirt removal to a yellowed varnish removal, or penetrated dirt removal, we have entered the conservator’s field.
Selecting the most appropriate protective coating for the exterior of steel wind towers involves balancing the variables of production and protection to maximize profitability. The coating solution that maximizes production and protection while realizing a profitability that is equal to or greater than owner expectations is an organic zinc-rich epoxy primer and polyaspartic urethane topcoat.
Building materials are routinely tested for flammability. Paints are also evaluated for flammability but because of their typical low applied thickness, coatings contribute very little fuel to a fire and do not normally need to be fire tested. Coatings, unless they are specially formulated fire protective coatings, like intumescent coatings, do not significantly affect the flammability of the substrate to which they are applied. It is the substrate rather than the coating which dictates the flammability. Thick film coatings, however, can influence surface flammability.
Using a polyurea elastomer coating system, a Midwest water filtration plant extended the design life of its filters by correcting problems emanating from water leaking through an existing epoxy coating system and concrete substrate.
The installation of protective coating systems must be accomplished in a manner that will avoid adverse electrolytic coupling between dissimilar metals in water tanks, process equipment, and even some atmospheric applications where condensing humidity and rainwater provide the aqueous medium for electrolytes. This paper discusses several examples of premature coating and structural failures resulting from the mixing of dissimilar metal types in systems where the anode and cathode areas are not optimized by design or engineering controls.
During military ship and offshore platform construction weight, International Maritime Organization (IMO) approvals, and VOC content are a prime consideration. There is a need of commercial products that can fulfill International Maritime Organization (IMO)/Safety of Life at Sea (SOLAS) and Qualified Product List (QPL) approvals, are lightweight, and contain no VOC, are environmentally friendly, and can be used for different applications
A new innovative high performance, zero VOC acrylic topcoat offers excellent corrosion resistance, weathering durability, early moisture resistance, freeze thaw resistance and dirt pick up resistance that is comparable to high VOC commercial acrylic. The performance properties of this zero VOC acrylic topcoat are compared to a high VOC commercial acrylic topcoat used in protective coating applications.
Industry executives involved in industrial blasting and coating projects may find it surprising that climate control equipment typically used in those processes played a major role in recovery efforts in New Orleans following Hurricane Katrina. This paper highlights how this equipment helped restore three important structures in New Orleans – the Louisiana Superdome, Notarial Archives and the evidence room of the New Orleans Police Department.
For the last 20 years polyurethane has been the leading topcoat technology in corrosion systems for both marine and industrial use. Performance, protection, appearance and total cost effectiveness are some of the factor’s customers have taken into consideration. Customers have a long list of demands and polyurethane has become a technology choice for a wide number of end markets.