What is a consequence of having water temperatures that are too low in the open feedwater heater?

In a steam system, maintaining the proper water temperature in the open feedwater heater is crucial for preventing issues related to water chemistry and overall system efficiency. When water temperatures are too low, it can lead to oxygen pitting in the boiler.

Oxygen pitting occurs because dissolved oxygen in water can react with the metal surfaces of the boiler at lower temperatures, resulting in localized corrosion or pitting. The colder water does not effectively reduce or eliminate oxygen, thus allowing it to remain in the system. The combination of high temperature and pressure in the boiler enhances the corrosive effect of the oxygen, leading to significant damage over time.

Conversely, higher temperatures usually facilitate better removal of dissolved gases, including oxygen, through the operation of the feedwater heater. This not only helps maintain the integrity of the boiler material but also improves overall efficiency in the steam generation process. Recognizing the importance of temperature control in the feedwater heater is vital for the longevity and safety of boiler operations.