Why is it important to warm up a turbine slowly before starting it?

Warming up a turbine slowly before starting it is crucial to prevent warping. Turbines, especially those made of materials like turbine blades and casings, can be quite sensitive to rapid temperature changes. When a turbine is subjected to sudden heating, the materials may expand unevenly. This leads to the risk of thermal stress, which can cause permanent deformation or warping of the components.

By allowing the turbine to gradually reach its operating temperature, the expansion of materials occurs at a more uniform rate. This controlled process helps maintain the structural integrity of the turbine components, ensuring they operate efficiently and without damage. A slow warm-up thus plays a significant role in prolonging the lifespan of the turbine and maintaining optimal performance during its operation.