ponytug
Super Member
Yes, there is, as @Jstpssng points out. Propane tanks and cylinders rely on pressure relief valves to release excess pressure. Those are designed to vent gas, not liquid, and can freeze open if liquid vents through them.Acetylene bottles need to be stored upright. That idea has spilled into other material transport. There’s no reason to keep propane upright or other gas cylinders.
Other compressed gases are supposed to be transported vertical for safety reasons in case of the valve breaking or shearing. The idea is that the 80lb steel torpedo of the tank with the sheared valve will go vertically down into the ground relative safely. Having seen the damage a horizontally moving sheared tank can cause, I would not want to be anywhere remotely close to a horizontally stored compressed gas tank.
More here:
And section 4650 e) below specifically calls out the need to have the gas vent in contact with vapor space at all times.
I think that these regulations are just trying to keep workers and those nearby safe.
All the best,
Peter