Which of the following statements is true about boiler safety valves?

Boiler safety valves play a crucial role in preventing excess pressure within a boiler, which could lead to dangerous situations. The statement that they are set to open at maximum pressure is correct because safety valves are designed to activate when the pressure exceeds a predetermined limit. This limit is set to protect the boiler and its components from damage or catastrophic failure.

When the pressure inside the boiler reaches this set point, the safety valve opens rapidly to release steam or water, thereby reducing the pressure back to a safe level. This immediate reaction is essential for maintaining safety in the operation of the boiler system.

Understanding why this statement is true helps in grasping the function of safety valves in maintaining safe operating conditions and the importance of regular maintenance to ensure they operate correctly at their specified pressure thresholds.