What is the safest storage scenario for propane cylinders in or near a building?

• A. Store indoors near ignition sources for convenience.
• B. Store in a dark, closed cabinet inside a building to keep it safe.
• C. Store in a well-ventilated outdoor or semi-outdoor area, upright and secured, away from ignition sources; inside buildings is generally restricted unless designed for it.
• D. Store horizontally on its side.

Answer: (C)

The safest way to store propane cylinders near a building is in a well-ventilated outdoor or semi-outdoor area, kept upright and secured, and kept away from any ignition sources. Propane is heavier than air, so a leak can pool near the ground and inside spaces, creating a higher fire or explosion risk if it accumulates. Storing cylinders upright keeps the valve and relief devices in their proper positions and helps prevent leaks or liquid propane from entering the regulator. Securing them prevents tipping or rolling, which could damage the cylinder or valve. Indoor storage is usually restricted because enclosed spaces can trap gas and expose people to danger, especially near heat or ignition sources. Storing horizontally is not appropriate because it can damage the valve and increase the chance of leaks. Keep them outdoors, ventilated, upright, and secured, away from flames, heaters, and other ignition sources.