Increasing Pipeline Pressure Rating Using CFRP Liners: A Case Study on an NTMWD Pipeline

The North Texas Municipal Water District (NTMWD) is considering making improvements to the transmission system and pumping scenarios to provide redundancy to their Wylie-Rockwall-Farmersville (WRF) Pump Station, and the planned pumping improvements required an increase in the working pressure rating of an approximately 8,000 ft long portion of the pipeline from 100 psi to 150 psi. The pipeline provides water to two delivery sites, which needed to stay in service throughout the pipeline rehabilitation. Following evaluation of open cut replacement and several trenchless rehabilitation methods, NTMWD selected carbon fiber reinforced polymer (CFRP) liners to strengthen three regions of the pipeline where pipe replacement was not feasible. This paper discusses the project from the feasibility study through construction with particular emphasis on the selection, design, and implementation of CFRP liners.

Read the article.