These sons of bitches definetely add oxygen to helium.
Eventhough it says 99% pure, they lie.
Really need more on this.
We aren't welders.
Also what about someone who is young?
They obviously don't look like welders at 19 years old do they?
How do you go to a store and buy a nitrogen tank. Also why do they even have to ask you shit?
It's legal for anyone to buy right? so if they ask you shit you don't have to answer or make small talk with them do you?
It is legal to buy and no you don't have to be a welder to buy it. You could simply go to an air gas supplier and request a 20CF filled nitrogen tank and that's really it. If they have low flow (liters per minute NOT gallons per minute) regulators even better.
They might not ask anything but they may be concerned ifn someone looks clueless because it's a pressurized tank and could pose a danger if not handled properly which may be why they ask what it's for.
You could always claim you need a tank for brewing, purging of paint cans/ school project etc
I don't know how in depth a line of questioning to be or if they even will but I don't think it hurts to have some sort of easy explanation.
You can buy prefilled nitrogen tanks online. I'll find the link later (it's in the exit bag megathread) which is where I got mine ~$180 for a brand new filled tank.
Gas supply stores may have them cheaper or even rent them at a lower cost as well.