The boiler shall be equipped with automatic devices responsive to variations in what?

When considering the proper functioning and safety of a boiler, it is critical for the system to have automatic devices that respond to variations in steam pressure. This is essential because maintaining the correct steam pressure is vital for the efficient operation of the boiler and the overall heating system. When steam pressure deviates from a designated range, it can indicate serious operational issues that, if left unaddressed, may lead to unsafe conditions, such as the potential for explosions or system failure.

Automatic pressure regulators and safety valves are examples of devices designed to monitor steam pressure and make adjustments as needed, ensuring that the system operates within safe parameters. This capability not only enhances safety but also ensures that the boiler performs at its optimal efficiency.

While factors like water temperature, fuel supply, and air flow are also important for the overall operation of a boiler, they do not have the same immediate impact on safety as variations in steam pressure. Hence, the focus on steam pressure underscores its critical role in boiler operation and safety management.