A common design feature of cylinders is a:

A common design feature of cylinders is a:

• A. Fill Cap
• B. Pressure Relief Device
• C. Manual Control Vent
• D. Air Monitoring Alarm

Answer: (B)

Cylinders are built with a pressure-relief device to prevent overpressure. If the cylinder is exposed to heat, overfilled, or otherwise stressed, the pressure inside can rise beyond safe limits. The relief device opens at a predetermined pressure or temperature and vents gas to bring pressure back down, often using fusible plugs, frangible disks, or a spring-loaded relief valve. This design feature is essential because it provides a fail-safe path to prevent cylinder rupture or explosion in unsafe conditions. The other items aren’t universal safety features built into the cylinder itself: a fill cap is primarily for protection during handling rather than relieving pressure, a manual control vent is not a standard intrinsic cylinder feature, and an air monitoring alarm belongs to monitoring systems rather than the cylinder’s design.

Cylinders are built with a pressure-relief device to prevent overpressure. If the cylinder is exposed to heat, overfilled, or otherwise stressed, the pressure inside can rise beyond safe limits. The relief device opens at a predetermined pressure or temperature and vents gas to bring pressure back down, often using fusible plugs, frangible disks, or a spring-loaded relief valve. This design feature is essential because it provides a fail-safe path to prevent cylinder rupture or explosion in unsafe conditions. The other items aren’t universal safety features built into the cylinder itself: a fill cap is primarily for protection during handling rather than relieving pressure, a manual control vent is not a standard intrinsic cylinder feature, and an air monitoring alarm belongs to monitoring systems rather than the cylinder’s design.