Heater Bypass System
Feedwater heaters are used in power generation to pre-heat the feedwater coming from the feedwater pump before being fed to the boiler in order to improve steam generator efficiency. The bypass system consists of two 3-way isolation valves, the HB is installed upstream from the heater, and the HBS is installed downstream. In normal operation both valves are opened, allowing water to flow through the heater. In case maintenance is required for the preheater, water needs to be bypassed around it, and it needs to be isolated. A quick shutoff prevents further damage to the preheater, and maintains feedwater supply to the boiler.