What is the specific height requirement for the pressure relief valve?

The specific height requirement for the pressure relief valve is that it must be positioned above the liquid level within the container. This is essential because the pressure relief valve is designed to vent pressure if it exceeds a certain threshold, ensuring safety by preventing potential explosions or other hazardous conditions.

If the valve is located below the liquid level, it may become submerged in the liquid, which would impede its ability to function properly. The valve needs to be able to vent vapor effectively to manage pressure build-up, and when it is above the liquid level, it can effectively release gas without being obstructed by the liquid. Positioning the valve correctly is critical to maintain the operational safety and integrity of propane storage systems.