Evaluation of Spray Applied Pipe Lining Effects on the Hydraulic Flow Capacity of a Pressure Pipelines

The inevitable aging of pipelines has become a challenge in the underground infrastructure industry. During the pipe's service life, corrosion can have a detrimental effect on the material and life span of the pipe. The corrosion effect increases with time, and in the worst-case scenario, corrosion can considerably reduce the effective internal pipe diameter, subsequently increasing the pipe roughness. The pipe roughness affects the friction factor and, consequently, has a negative impact on the pipe flow and pumping requirements. Therefore, spray applied pipe lining (SAPL) can be a potential rehabilitation process to reduce the impact of corrosion and improve pipe roughness. Lining the host pipe decreases the internal diameter (ID), which can affect the flow capacity of the pipe, especially in pressure pipes. Therefore, it is important to evaluate the flow characteristic of the lining system when applied to pressure pipes. The hydraulic flow test was designed to measure the friction factor of the lined pipe and then compare it with the friction factor of the bare new and corroded carbon steel pipes. The friction factor for all scenarios was calculated at a high Reynolds number. In addition, the test was aimed to measure the roughness profile of the liner and compare it with corroded carbon steel pipes. In the end, the head loss was compared for bare pipe, lined, and corroded pipes to evaluate the effect of the lining system on the internal diameter, roughness, and flow capacity of the pressure pipes.