My LWS (Roberts Oxygen) either sells up to 80cf tanks, or leases larger ones, 125 or 330cf on an annual or monthly basis.
I am just starting to tig, it's a hobby, I have a few projects to do early on but I won't be welding for a living or anything. Typically anything I do i go for value, more bang for the buck. renting a 336cf tank is $65 deposit, $140 for the gas and then either $10/mo or $90/yr. and then another $12/mo or $90yr for hazmat charges... Talk about effing you in the drive thru!
What do most hobbyists go with? if i go through a single bottle of 336 its basically $336/yr, it'd give me about 22 hours of welding at 15cfh... Seems like a whole lot of welding to me!
Is that a lot? guess if i'm just a hobby welder with occasional projects the 80cf is probably enough.
I'll be welding mild, stainless, and a little aluminum, probably with an average of 10-12cfh. I'll also be doing some back purging at some point, is it better to get 2 tanks for that, or a splitter?