Burst Testing and Evaluation of Spray Applied Pipe Lining as a Class IV Lining System

Spray applied pipe lining (SAPL) is a recent pipe rehabilitation technology that can address the issues of pipe aging and failure; however, its usage as a fully structural lining as per AWWA structural lining system is still in the development phase. This paper presents methodologies to test the hybrid polyurea liner material for pressure integrity under internal hydrostatic pressure when designed as an AWWA Class IV lining system with no support from the host pipe. The test methodology includes testing of pipe samples with 8-in. diameters at different temperature conditions from 41°F to 150°F. The test results determined the burst pressure, mode of failure, and hoop stress on the SAPL due to internal pressure. The test results determined a relationship between the pipe thickness and pressure at different temperatures, which are required to determine the performance of the material under different environmental and loading conditions.