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Field and Laboratory Experience with Polyurethane Pipe Linings

Field and Laboratory Experience with Polyurethane Pipe Linings
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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. 

Product Number: 41214-863-SG
Author: Allen Skaja, David Tordonato, Bobbi Jo Merten
Publication Date: 2014
Industries: Pipelines, Tanks, and Underground Systems , Coatings , Corrosion Monitoring and Control
$0.00
$20.00
$20.00

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. The laboratory testing has utilized Electrochemical Impedance Spectroscopy as a screening/ranking method in the selection of new coatings for severe service environments. The polyurethane linings have superior barrier resistance compared to epoxy linings. However, long term (4 years) water immersion exposure produced large blisters and severe undercutting in scribed panels. This undercutting has also been witnessed in a Reclamation field assessment where polyurethane linings were used. Potential permanent repair solutions to this problem will be discussed.

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. The laboratory testing has utilized Electrochemical Impedance Spectroscopy as a screening/ranking method in the selection of new coatings for severe service environments. The polyurethane linings have superior barrier resistance compared to epoxy linings. However, long term (4 years) water immersion exposure produced large blisters and severe undercutting in scribed panels. This undercutting has also been witnessed in a Reclamation field assessment where polyurethane linings were used. Potential permanent repair solutions to this problem will be discussed.

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Product Number: 41214-869-SG
Author: Andreas aus der Wieschen, Matthias Wintermantel, Todd Williams, Ahren Olsen
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Solvent-free two component polyurethane (2-K-PU) systems have been approved as suitable protective coatings systems since many years. Two component polyurethanes are favored within pipeline and tank constructions where high performance and durability have to be accomplished under harsh conditions (e.g., field application, high service temperatures, high salt load, wet soil conditions etc.). 
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Adhesion Measurements of Coatings on Cylindrical Steel Pipes: Variability & Significance

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Author: S. G. Croll, B. D. Keil
Publication Date: 2014
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Quality assurance of coatings on steel water pipes commonly relies on tensile pull-off measurements of the coating-steel adhesion, according to ASTM D4541. These tests are performed by adhering a metal ‘dolly’ to the coating with an adhesive, then scoring around the dolly circumference, through the coating down to the steel surface, before recording the stress necessary to pull the dolly (and coating) away from the steel pipe. 
Southern Nevada Water Authority-Polyurethane Lining Evaluation and Testing
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Southern Nevada Water Authority-Polyurethane Lining Evaluation and Testing

Product Number: 41211-637-SG
Author: Cynthia L. O’Malley, Gina Neilson
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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.
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