Applicability of Hole-Spanning Design Equations and FEM Modeling for Carbon Steel Pipelined with Spray Applied Pipe Lining

Polymeric Spray Applied Pipe Lining (SAPL) is a renewal technology that is continuously developing to provide solutions to extend the lifespan of deteriorated pipelines in water utilities, as well as industrial applications. As per the American Water Works Association (AWWA) Structural Classification of Lining Systems, pipes with corrosion holes, joint gaps, or circumferential or longitudinal cracks can be rehabilitated as a Class III lining system, non-bonded to the host pipe. This paper has developed a testing methodology, in which the hybrid polymeric SAPL applied to the host pipe was non-bonded. A 30-in. SAPL-lined cast iron pipe with a hole of 4 in. was tested under 500 psi of hydrostatic pressure. A Finite Element Model (FEM) was developed to model the laboratory results, and more laboratory testing will be done to develop a comprehensive FEM model. The experimental and the FEM models determined the applicability of the 2019 version of AWWA hole-spanning design equations as a non-bonded application to the host pipe.