When taking a steam boiler out of service, what is the temperature the water must be maintained above for about one hour to release gases?

The process of taking a steam boiler out of service involves several important safety and technical considerations, particularly regarding the treatment of the water within the system. One crucial aspect is preventing the release of dissolved gases, which can lead to issues such as corrosion or the formation of harmful vapor clouds.

Maintaining the water temperature above 85°C (185°F) for about one hour is significant because this temperature is sufficient to ensure the release of gases that are dissolved in the water, such as oxygen and carbon dioxide. At higher temperatures, the solubility of these gases in water decreases, promoting their escape from the water solution. This is essential because allowing these gases to remain can result in rust and corrosion within the system, which can compromise the integrity of the boiler.

By adhering to this temperature guideline, operators can effectively mitigate the risks associated with gas release and prepare the boiler for a safe and reliable restart when needed. The specified temperature aligns with best practices in boiler management, ensuring a more effective purging process before the equipment is taken out of service or when conducting maintenance.