We have perfectly insulated a large LPG cylinder outdoors on a hot day using foam. Then we connected a hose to the tube outlet and a stove with high gas consumption to the end. We lit the stove and...

We have perfectly insulated a large LPG cylinder outdoors on a hot day using foam. Then we connected a hose to the tube outlet and a stove with high gas consumption to the end. We lit the stove and after using it for a while, we noticed that the outside of the tube was snowed. What could be the thermodynamic explanation for this situation?