Bapco wanted to replace the #5 CDU Heaters with a single High Efficiency Heater inorder to enhance company profitability by significantly reducing the fuel gas consumption; increasing the availability of the unit; reducing maintenance costs; and improving operability and environmental performance. In this project, the existing 5CDU 7F601A, 7F601B and 7F603 heaters were replaced with one Vertical Cylindrical (VC) High Efficiency Heater and Burner Management System.