Please help me! ^-^?

Question

Okay so I need to buy a 20 cf cylinder of nitrogen ( They are GREAT for tires I hear ) but do not know where I can buy one, since a hear alot of places sell the cylinder but not the gas,
or the gas but not the cylinder, my main question is how do i go about getting one?
Extra quesions,
Do i need to have it delivered, I hear there are special rules or laws for transporting it ( im only taking it from the store to my house btw )
Also im like moving to denver area soon ( am currently in san diego area ) and needed to know if I can take it when we move ( meaning should i wait till after we move to get it ) since its high pressure and all.
And lastly how long does nitrogen last in a tank, I mean my friend says she has some left in hers but its been in there for months.
Thank you so much in advance everyone who answers! :D
Ally

p.s. please dont suggest to just bring my car/tires in to have them filled, id rather do it myself or have it on hand :p

I was going to put this under chemistry or suttin but there seems to be no activity there :/

Answer 1

You can buy nitrogen gas from any welding supply house. The tanks come in a wide variety of sizes. They won't sell you the cylinder due to federal safety regulations, but they will let you have it on deposit. When your tank is empty, you can exchange it for a full one (at a price, of course). You will also need a regulator and the appropriate fittings. Most suppliers carry brochures on the safe handling of high pressure gas cylinders. If the cylinder is secured AND capped, you should have no difficulty transporting it long distances, but if you are moving soon, you might want to wait until after your move.

If you are using it only to inflate your car tires, it could last years, unless you get a very small tank.