When activating an induced draft cooling tower, what is the last step in the procedure?

When activating an induced draft cooling tower, starting the induced draft (I.D.) fans is the last step in the procedure because this action is critical for ensuring the proper airflow through the system. I.D. fans help to draw air through the cooling tower and over the heat exchange surfaces, facilitating the cooling process by enhancing the evaporation of water.

In the activation procedure, steps such as checking water levels, opening water valves, and closing drain valves are necessary for ensuring the system is ready for operation and safe to turn on. However, these preparatory actions must be completed before the cooling tower can efficiently perform its function, which significantly depends on the airflow created by the I.D. fans. Thus, without initiating the fans as the final step, the cooling tower would not operate effectively, leading to inadequate cooling performance.