What condition does a boiler face if it is not laid up properly after 24 hours idle time?

When a boiler is not laid up properly after being idle for a period, such as 24 hours, it becomes susceptible to corrosion. This occurs because moisture, combined with heat and oxygen, creates an environment that promotes the oxidation of metal surfaces within the boiler. If the boiler was not properly preserved with protective measures, such as inhibitors, the exposed metal can start to corrode, leading to deterioration and potential failure of the boiler components.

In the context of boiler maintenance, laying up involves steps taken to protect the boiler from internal and external factors when it is not in use. Failing to properly utilize these steps can lead to significant long-term damage, making corrosion the primary risk when the boiler is left idle for an extended time without the appropriate precautions.