What is the typical design pressure for feedwater systems in a power plant?

The typical design pressure for feedwater systems in a power plant is indeed broadly defined as 150 to 900 psi, and this range reflects the varying requirements based on different boiler designs. Boilers operate under specific pressure conditions to optimize efficiency, maintain safety, and ensure proper heat transfer for steam generation.

Feedwater systems work to preheat water before it enters the boiler, and it is essential that these systems can handle the pressure that corresponds to the boiling point of water at the operating temperature of the boiler. For example, higher-pressure boilers, which operate at pressures closer to the upper end of the specified range, require feedwater systems designed for increased pressure handling capabilities.

The range provided also allows for positive pressures that can accommodate different operational scenarios, including fluctuations that may occur during plant operation, which is critical for maintaining system integrity and efficiency. Generally, as boiler technology and designs evolve, they may shift toward higher pressures, hence the importance of having a broad range to ensure safety and efficiency across various plant configurations.