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The Southern Nevada Water Authority (SNWA) is a regional agency whose mission is to manage water resources and develop solutions that will ensure adequate future water supplies for the Las Vegas Valley. Its primary water resource is the Colorado River via Lake Mead. Since 2000, persistent droughts have resulted in decreasing Lake Mead water levels. To reduce Southern Nevada’s reliance on the Colorado River, SNWA has begun planning for the development of in-state groundwater resources north of Las Vegas. Initial planning efforts identified project specific requirements that could potentially justify the use of polyurethane lining systems in lieu of traditional cement mortar lining for over 200 miles of large diameter water transmission pipeline.
The Bureau of Reclamation’s Materials Engineering Research Laboratory has been evaluating polyurethane pipe linings for severe immersion exposure, specifically for outlet works and penstock linings. Polyurethanes have several advantages over other coatings, such as application temperature range, faster cure times in cold temperatures, rapid return to service, coat large surface area rapidly, low viscosity (i.e., accommodates pumping over longer distances), and greater impact resistance.
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An experimental setup was designed to investigate the cathodic protection (CP) penetration into coating disbondment. Embedded detection probes underneath the disbondment enabled pH and steel potential measurements without disturbing the environment inside the disbondment.
An overview on lessons learned with high-performance polyurethane elastomers coatings in Alberta oil sands service, from material properties, operating conditions, wear data, to useful life and cost savings. Wear monitoring system with no perforation of the pipe wall is discussed.