Where is the relief valve placed on a propane tank?

Where is the relief valve placed on a propane tank?

• A. Vapor space
• B. On the liquid outlet
• C. At the base of the tank
• D. Along the tank top

Answer: (C)

Relief valves prevent overpressure by venting propane gas when the tank heats up or pressure inside rises. They are mounted on the top portion of the cylinder, near the valve assembly, so any gas that vents can escape upward away from people and ignition sources. This top location also ensures that the vented substance comes from the vapor space, not from the liquid, and keeps the vent path clear. Placing the vent at the base would be ineffective and unsafe, since it wouldn’t reliably vent rising pressure and could expose the vent to ground-level hazards.

Relief valves prevent overpressure by venting propane gas when the tank heats up or pressure inside rises. They are mounted on the top portion of the cylinder, near the valve assembly, so any gas that vents can escape upward away from people and ignition sources. This top location also ensures that the vented substance comes from the vapor space, not from the liquid, and keeps the vent path clear. Placing the vent at the base would be ineffective and unsafe, since it wouldn’t reliably vent rising pressure and could expose the vent to ground-level hazards.