Which step is part of the safe procedure for shutting down a boiler?

Allowing the system to cool down gradually is an essential part of the safe procedure for shutting down a boiler. A controlled and gradual cooling process helps prevent thermal shock, which can occur when a boiler is cooled too quickly. Rapid temperature changes can lead to stress in the metal components, potentially causing cracks or other damage.

In addition, a gradual cooldown allows for the safe dissipation of steam pressure and ensures that the boiler components can stabilize at lower temperatures without the risk of extreme temperature differentials. This practice not only extends the lifespan of the boiler but also enhances overall safety during the shutdown process, protecting personnel and equipment alike.