The Water Quality Assn. (WQA) shared highlights of its...
Utah State University study validates the performance of PVC pipe used in water networks
The Utah State University (USU) Buried Structures Laboratory has published a comprehensive study on PVC pipe excavations, testing and lifecycle analysis. USU, located in Logan, Utah, is also home to the Utah Water Research Laboratory and has contributed to water and wastewater research internationally for more than 50 years.
The study reviews past dig-up reports and presents new quality control testing results that continue to validate the performance and longevity of PVC pipe used in water networks. A combination of pipe examination and testing data in conjunction with previous pipe break studies support PVC as a sustainable pipe material and confirm its longevity in excess of 100 years.
“Understanding the longevity of pipes improves the ability of a water utility to make better infrastructure investment decisions with improved affordability results for customers,” said report author Dr. Steven Folkman.
A previous USU study on water main breaks in the U.S. and Canada showed PVC pipe to have the lowest rate of main breaks of all pipe materials examined, which included ductile iron, cast iron, steel, concrete and asbestos cement. This report continues to explore PVC reliability and longevity. The critical issue of affordability also is examined.
“This study provides the next body of evidence supporting the ability of utilities to address the failing infrastructure and the affordability dilemma,” Folkman said. According to the U.S. Conference of Mayors, a total of $2.28 trillion is needed in water and wastewater piping over the next 20 years.
A major finding of the study is that U.S. water utilities can reduce water main breaks and operations and maintenance costs by including corrosion-proof PVC piping in their replacement programs. Earlier research by USU showed that corrosion of iron piping is a major problem for water systems, and newer metallic pipe is experiencing failures more rapidly than older types because of its thinner walls.
The report also found that PVC pipe offers a high degree of resilience in freezing conditions. This would help reduce the ever-increasing amount of iron pipe that fails during winter across the U.S. annually.
“Many utilities have fallen short in producing appropriate cost and lifecycle comparisons of pipe performance. Data on water pipe longevity must be combined with asset management techniques to make water and sewer infrastructure more durable and affordable. As well, elected officials, financial managers and utility professionals must work together to create a new management paradigm for water and wastewater systems,” Folkman said.
This study contributes to the continuing efforts of the U.S. Environmental Protection Agency's aging water infrastructure research and work by the American Water Works Assn. and American Society of Civil Engineers.