What action must be taken if the safety valves of a boiler cannot be adjusted to lift within the prescribed range?

The action to be taken if the safety valves of a boiler cannot be adjusted to lift within the prescribed range is that the boiler shall not be used for steaming until corrected. This is critical because safety valves are essential for preventing overpressure conditions within the boiler that can lead to catastrophic failures, such as explosions. If they are not functioning properly, the risk of exceeding the maximum allowable pressure increases significantly, jeopardizing both equipment and personnel safety.

Using the boiler under such circumstances would be highly dangerous and could result in severe accidents. Therefore, the correct procedure mandates that the boiler must remain out of service until the safety valve issues are resolved, ensuring a safe operating environment. It’s important to adhere strictly to these safety standards in order to maintain the integrity of the system and protect those who operate it.