Vital Air Service is maintained at what psig?

Vital Air Service is maintained at what psig?

• A. 125
• B. 150
• C. 100
• D. 135

Answer: (A)

Vital air service is kept at 125 psig to ensure reliable operation of essential pneumatic devices under varying loads and potential minor leaks. This pressure is high enough to actuate valves, dampers, and safety controls consistently, yet low enough to stay within the design limits of the system’s piping, regulators, and safety hardware. Normal service air operates at a lower pressure (about 100 psig), so the vital air setpoint is raised to provide the necessary performance for safety-critical functions without pushing the system beyond its rated capabilities.

Vital air service is kept at 125 psig to ensure reliable operation of essential pneumatic devices under varying loads and potential minor leaks. This pressure is high enough to actuate valves, dampers, and safety controls consistently, yet low enough to stay within the design limits of the system’s piping, regulators, and safety hardware. Normal service air operates at a lower pressure (about 100 psig), so the vital air setpoint is raised to provide the necessary performance for safety-critical functions without pushing the system beyond its rated capabilities.