When should the cooling water to the oil cooler be turned on during the startup of a large condensing turbine?

During the startup of a large condensing turbine, the cooling water to the oil cooler should be turned on when the oil reaches normal operating temperatures. This practice is important because the proper operation of the lubricating oil system is critical for the performance and longevity of the turbine.

When the oil is at normal operating temperatures, it ensures that the lubricating oil has the appropriate viscosity to effectively coat moving components, thereby minimizing wear and preventing damage. By waiting until the oil reaches these temperatures before circulating cooling water, you are helping to maintain the oil at optimal temperature and viscosity, preventing it from becoming overly hot while not cooling it down too early in the startup process.

Starting the cooling water too soon can cause the oil temperature to drop significantly, which could lead to inadequate lubrication and increased wear on the turbine components. Conversely, turning on the cooling water too late, after the oil has already exceeded its temperature limits, can also lead to risks of thermal damage and reduced efficiency.

This timing allows for a balanced operation, where cooling supports temperatures that facilitate proper lubrication, enhancing operational stability and safety of the turbine system.