Just because the propane has been unloaded and is now sitting and waiting to be used doesn’t mean it’s no longer a danger!  

Just like in transport, propane cylinders must be stored upright, secured, and sealed. Do not stack them, empty or full. That is a house of cards that you do not want to fall! 

Because propane gas is heavier than air, it can displace oxygen in low-lying and poorly ventilated areas. This is a major health and safety concern, and propane asphyxiation can lead to injury or even death. Proper ventilation of storage areas is therefore a must.   

Ideally, propane cylinders are stored outside, which ends many ventilation issues before they begin. But if propane must be kept inside, make sure the room is properly ventilated, a door provides a quick exit if necessary, and the cylinders are kept away from doorways, walkways, and airway intakes. Always check local fire codes and CSA B149 requirements before storing cylinders indoors. 

As you can see, proper propane storage is more than setting down a propane cylinder (empty or full) and calling it a day. Always ensure proper storage procedures are in place and adhered to.