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This paper gives an update on the latest developments of the new generation of waterborne Polyurethane Topcoats (PU topcoats) for flooring which were presented during the annual SSPC meeting October 2003. Topcoats are commonly used in the construction industry over functional floor coatings or as sealers for concrete.
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Prompted by requests from Specifiers and Steel Shop Fabricators, a Non-Zinc coating has been developed that has attained a Class B Slip Coefficient rating and therefore can be applied to faying surfaces of slip-critical bolted connections. Results show that this product offers fast dry times and excellent corrosion resistance.
The South Valley Sewer District, located outside of Salt Lake City, Utah, experienced severe degradation of the concrete substrate the Membrane Basins at the Jordan Basin WRF. The Bowen Collins & Associates designed facility initially opened for service in July of 2012. By 2017 the facility was showing significant effects of concrete deterioration from chemical attack, caused by citric acid and sodium hypochlorite used as a part of the cleaning procedures in the membrane basins.
This paper compares and contrasts the accelerated laboratory autoclave (NACE TM0185) performance at 300°F (149°C), and 250 psig, of eight polycyclamine cured epoxy linings. The latter were tested for tank, vessel and pipe spool applications in the oil and gas industry. Five of the linings were commercially available and three were experimental. A modified amine cured epoxy was also evaluated in the study, a lining used to transport shale oil in railcars at temperatures up to 200°F (93°C).
An emerging market driver in industrial water treatment is the move to more sustainable chemistries. Corporate sustainability goals are becoming more common and more stringent. Customers are turning to water treatment companies for innovative solutions that can satisfy their sustainability goals and not sacrifice performance or asset integrity. Indeed, a major trend in evaporative open cooling water treatment is to move away from heavy metals such as zinc and other environmentally questionable materials such as phosphates. Another area of cooling water that is in need of a sustainability refresh is closed cooling loops. The most widespread closed cooling treatment programs are based on combinations of nitrite, molybdate, and borate. All three of these chemicals have regulatory, discharge and/or SH&E concerns.
Pressurized Atlas Cell Testing is commonly understood to be an aggressive accelerated test for lining systems due the combination of pressure, temperature and a thermal gradient across the coating film known as the Cold Wall Effect. This is especially true when Carbon Dioxide (CO2) is added to the gas phase, as CO2 is miscible with oil and soluble in water. A familiar gas mix of 5% CO2, 5% Hydrogen Sulfide (H2S), and 90% Methane (CH4) are used in test protocols to simulate head space conditions of tanks and pressure vessels in oil and gas production conditions.
Coal tar enamel provides an extremely long service life, under the right conditions. The Bureau of Reclamation (Reclamation) has observed more than 80 years of corrosion protection at facilities such as Hoover Dam. The coal tar enamel linings in penstocks and outlet works that are buried, encased, or in tunnels maintain excellent condition with minor damage. However, when temperature fluctuates between hot and cold, the enamel is stressed and develops alligator cracking.
The primary structure of many outdoor baseball parks and football stadiums is exposed structural steel. These facilities are often located in major cities in areas that may present challenges in control of corrosion. The challenge is also manifested in the fact that the structural steel frame becomes an architectural feature which must be maintained as an aesthetic element.
This paper focuses on the Norwegian offshore sector and on the type of coating systems that are currently selected for new platforms. Where shall the coating be used, what coatings are chosen and why have they been chosen.
Fabricators and Construction Firms rely on sub-tier vendors to supply a vast array of components and equipment for integration into the products they are supplying their clients. This may include valves, engines, motors, power supplies, tanks, tubs, vessels and other numerous items. The items and components provided by sub-tier vendors are normally prepared and coated prior to being delivered with what are typically referred to as original equipment manufacturer (OEM) coating systems.