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The polyurea technology is not new to pipelining work, with earlier basic applications dating back more than 15 years. Much of this work was either performed by hand spraying (large diameter pipe) or simple robotic systems for individual joint sections of pipe. Continued work over the years has proven that in-place pipelines can be commercially completed as well. More recent work has even shown that in addition to long, straight runs, robotic developments have allowed for lining both 45° and 90° radius bends in the pipeline system.
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In restoration cleaning of historic masonry, you usually know based on contaminants and building fabric what kind of cleaner will be effective on a dirty building. You’ll use one type of restoration cleaner for atmospheric staining, and another for biological soiling. You’ll have an idea, going in, what kind of restoration cleaner to at least try. Not having that kind of information, in my experience, is what makes paint removal from historic – or just old – masonry the most challenging branch of restoration cleaning.
Explains why concrete floors need protective treatments, identifies two main categories of protective treatments, and recommends appropriate protective treatments based on purposes and finishes of concrete floors.
For years, accelerated weathering test equipment has been utilized to showcase performance of coatings as a means to justify changing to new and “better” materials. While an accelerated weatherometer is useful in confirming a material’s performance, the results can be misleading in certain situations, resulting in misguided decisions based on a marketing department’s zeal to secure additional sales.
The determination of the concentration of soluble salts on a surface prior to the application of paint is a key inspection task for most protective coating processes. The entrapment of soluble salts, particularly on a steel surface can lead to premature coating adhesion failure and corrosion cells being established.
Specifying dehumidification for blasting and coating projects has become more of a standard practice on tank projects and is becoming more common inside containments and vessels.
Time is money and the ability to speed up the process of taking and analyzing coating thickness readings will always pay dividends in reducing inspection costs. Scanning an area of painted steel will always be quicker than taking individual readings but there was always the danger of wearing the probe and reducing its life.
One of the, if not the most, vexing problems for bridge maintenance personnel is the deterioration of bridge components below leaking joints. The joints may be open or closed, construction or expansion, but all seemingly leak shortly after construction or resealing. The bridge components affected by the leaking joints may be steel or concrete, but the end result is the same, deterioration.
In the spring of 2014, a new SSPC-PA21 standard is scheduled to be published. Despite the fact that this is the second major revision in as many years, new technologies and techniques have been introduced since the 2014 standard was revised and sent to ballot. Some examples include a factory-calibrated coating thickness gauge with pre-defined surface profiles, as well as a scanning probe designed to be slid across a cured coating while taking readings in real time. When these new technologies are put into practice, dramatic improvements in overall inspection times and data accuracy can be seen.
The exopolysaccharides (EPS) are a class of renewable natural polymers, which present anti-fouling property. Therefore, it may be used as an alternative to conventional additives currently used in anti-corrosive paints. The copper oxide is an additive commonly used due to its anticorrosive and anti-fouling properties.
Compared to other polymeric materials, silicone offers greater performance in harsh environments. Inherently silicone possesses a large coefficient of thermal expansion (CTE), low modulus, and a low glass transition temperate (Tg). These attributes allow it to maintain elastomeric properties for continuous operation when exposed to extreme heat, cold, and/or UV radiation. Durability is the reason silicone materials are frequently employed as coatings and sealants.