Originally Posted by hokenfloken
I do have the CO2 tank and fittings to fill it so I could purge it. Pardon my ignorance, but how exactly do I purge the tank of oxygen? I got a great deal on the kegging system but I haven't started using any of it since I'm currently purchasing my first house and live in a small apartment right now.
Hit the keg with 20 PSI or so for a few seconds. Wait for a minute or two (co2 is heavier than air, so the gases will stratify) and then open the pressure release valve which will force the air out. Even if a small amount of air remains, the bottom layer is c02 and as you fill from the bottom you will push any remaining air out.
After you fill, it doesn't hurt to repeat this process to purge the head space of any air that entered during the transfer, if you filled through the opening. If you fill through a beverage out disconnect and keep everything closed, you don't need to do the second purge on the filled container.