Very nice work on that tank. For those who are wondering about welding on gas containers, it brings to mind a story from long ago. The relatives had a very large farm up in Oregon of over 500 acres, huge tractors, and loads of equipment. They had a beautiful shop with room for two tractors in bays, and then about a 30x30 shop with all the welding equipment and lathes and tons of tools. For some reason they decided they needed to cut a 55 gallon drum up for use on something, and this was a gas container. So they drained it and ran the hose and filled and drained several times, and let it set for a week and thought they were safe. You may have already guessed the sad ending. The instant the torch hit that can the resultant explosion blew my uncle out of the shop through a luckily open doorway into the yard. The boom could be heard for a mile and shifted the shop portion on the concrete slab a foot off the foundation. The interior was considerably trashed as you might expect. Gas fumes can be hugely entertaining. Uncle survived thanks to the open door.....