Hardly anybody rents/leases tanks anymore except large users that turn them around fast like steel shops and structural steel contractors. That way they do not have to store them after needed or worry about damage or retesting. Acetylene is fast going out of style due to cost and being replaced by propane and natural gas. Propane in the field NG in shops, Acetylene is only required if you are welding steel w/a torch or need more heat value for some odd reason. I keep an acetylene tank for the rare times I torch weld steel. I remember the days when the primary source of Acetylene was generators using carbide and water, long gone except in museums. My dad and I used one for years. The welding school I went to as a teenager had a huge generator. That was the first thing we learned was servicing the generator. It took 100# of carbide per filling (about a weeks worth of gas).
Ron