naturist wrote:
There are portable propane tanks like the 20 pounders people use for gas grills that come in 5, 10, 15, 20, 30, 40, 60, and 100 lb sizes. THOSE should NEVER be stored inside for the very reason this thread exists. There are also permanently mounted (usually horizontal) propane tanks on some of the bigger RVs as well as on some trucks. The permanent-mount jobs have a vent that discharges outside the rig, even though the tank itself is mounted inside.
IF they are 'portable' they are 'cylinders' (not tanks) and under DOT
If they are permanently mounted they are 'tanks' ASME