Evaluating the Effect of Host Pipe’s Integrity on Determination of Liner Thickness in Spray-in-Place Pipe (SIPP) Application for Underground Pipes

The Spray-in-Place Pipe (SIPP) method has gained widespread acceptance as an efficient and cost-effective solution for rehabilitating deteriorated pipelines. Despite this, current ASTM and AWWA standards for fully deteriorated pipes make the assumption that the host pipe provides no structural support, disregarding its residual strength. In reality, even pipes in an advanced state of deterioration can still offer some degree of resistance. This research seeks to address this oversight by investigating how different levels of metal loss in a host pipe affect the required liner thickness for rehabilitation. Finite element models will be developed using ABAQUS software to simulate various metal loss scenarios. The goal is to assess how different material loss percentages influence the liner's structural performance and thickness requirements. The findings show that current ASTM and AWWA standards ignore the residual strength of a host pipe, which leads to an increase in the liner required thickness; hence, rehabilitation cost.