When installing a regulator, the discharge point from the pressure relief valve must be at least how many feet horizontally from any building opening below the discharge point?

When installing a regulator, the discharge point from the pressure relief valve must be at least how many feet horizontally from any building opening below the discharge point?

• A. 2 ft
• B. 3 ft
• C. 6 ft
• D. 10 ft

Answer: (B)

The key idea is keeping vented propane away from building openings. When a regulator’s relief valve vents, it can release propane vapor if the tank heats up or the pressure relief operates. That vapor is flammable and can flow toward doors, windows, or other openings, so you must place the discharge point far enough away from those openings to prevent gas from entering occupied spaces or catching fire. Three feet horizontally from any building opening below the discharge point provides a practical safety buffer. Propane vapor is heavier than air and tends to hug the ground and drift toward lower openings, so this distance helps prevent the vapor from entering a window, door, or vent. Distances smaller than that (like two feet) risk gas reaching an opening, while much larger spaces (six or ten feet) exceed the needed safety margin for this situation and aren’t required here. So, the best answer is three feet because it establishes a safe, minimum clearance to protect people and structures from vented propane.

The key idea is keeping vented propane away from building openings. When a regulator’s relief valve vents, it can release propane vapor if the tank heats up or the pressure relief operates. That vapor is flammable and can flow toward doors, windows, or other openings, so you must place the discharge point far enough away from those openings to prevent gas from entering occupied spaces or catching fire.

Three feet horizontally from any building opening below the discharge point provides a practical safety buffer. Propane vapor is heavier than air and tends to hug the ground and drift toward lower openings, so this distance helps prevent the vapor from entering a window, door, or vent. Distances smaller than that (like two feet) risk gas reaching an opening, while much larger spaces (six or ten feet) exceed the needed safety margin for this situation and aren’t required here.

So, the best answer is three feet because it establishes a safe, minimum clearance to protect people and structures from vented propane.