have_blue
Veteran Member
Because of the great size of barrels and their flat ends, they won't hold much pressure. I would say anything over 3 or 4 pounds would bulge it. Having said that, it only takes a pound of pressure to really shoot liquid from a barrel. In fact, I use a 55 gal. plastic drum with "air over diesel" to fuel my tractor. I can fill my 13 gal. tractor tank from a 1" hose and 1-2 pounds of air in about 2 minutes... and that's going up hill a little. If you could find a finely graduated air gage, say graduated in .1 PSI, you could control the pressure and be safe. If a barrel blew with less than say 3-4 psi, it would just make a swooshing sound, not a bang.