At what PSI is the safety valve usually set to open?

A safety valve is a critical safety device designed to prevent pressure buildup in systems such as steam boilers, air compressors, and other pressurized environments. Typically, the valve is set to open at a specific pressure to release excess pressure and prevent potential hazards like explosions.

The correct answer is based on industry standards, where many pressure systems have safety valves calibrated to open at 150 PSI (pounds per square inch). This threshold allows for the maintenance of safe operating conditions by managing excess pressure effectively. When the pressure exceeds this limit, the valve opens to release pressure, ensuring the system remains within safe parameters.

Understanding that 150 PSI is commonly used as a safety threshold highlights the importance of regular maintenance and inspections of safety valves to ensure they function properly, as operating above this pressure can lead to unsafe situations.