What is the function of the MFP warm-up line?

The function of the MFP (Main Feedwater Pump) warm-up line is to preheat the feed pump and its casing during startup. This process is crucial because it helps to ensure that the pump and its components reach an appropriate operating temperature before being subjected to high pressures and flow conditions. Preheating reduces the risk of thermal shock and promotes better efficiency and longevity of the pump by helping to eliminate any condensation or residual moisture that may cause issues during operation.

Preheating the pump and casing allows for smoother operation and minimizes wear and tear, ensuring that the pump can efficiently deliver water to the steam generators. Operating at optimal temperatures also helps in maintaining the overall thermal efficiency of the system. Therefore, preheating is an essential step in the startup procedures of the MFP to ensure reliability and performance.