Power plants need to evaluate the susceptibility like what happened in Texas in 2021. The cold temperatures cause water filled pipes that aren’t a part of the process flow to freeze. These frozen pipes interrupt power plant operations and can cause widespread outages like what happened in Texas. The goal of the project is to design, build, and run a test rig to model thermal mixing in a stagnant line. The flow rate of the hot process fluid must be kept low to prevent momentum mixing and make sure only the temperatures mix. Momentum mixing is well understood while thermal mixing is less understood. The stagnant line must be cooled with an ambient temperature of at least 20 degrees Fahrenheit. The stagnant line is a 10 foot stainless steel pole with a 2 inch inner diameter and is schedule 40. The range of the hot process fluid will be from 60 degrees Fahrenheit to 100 degrees Fahrenheit. This will be to see how the temperatures mix along the dead leg. Using thermocouples along the stagnant line, it can be determined where freezing occurs along the pipe.