November 11, 2021 by Turnarounds are critical events within the maintenance framework of refineries. Today, many industry turnarounds are executed in conjunction with one or more large capital projects. Experience and data show that the inclusion of greater than 30 percent capital project work into a turnaround execution window severely heightens the complexity of the event. The interface between the capital project and turnaround teams has historically been one of the most difficult to manage and is even more critical when large projects are involved. Best and emerging practices for these High Complexity turnarounds require more advanced planning, coordination, and alignment between the capital project and turnaround execution teams. These best practices are the focus of this presentation. The presentation utilizes case studies and industry data to substantiate the impact that a large capital project component has on a turnaround event. The presentation also looks at the metrics for success of the turnaround outcome.