lerpy - 5/24/2013 1:09 PM
Yup some shops put the tank in the water to cool the tank for a better fill, however from what I have been told the tank ( if putting it in water) should go in before the fill starts, once the tank gets hot from the fill dunking it in cool water can be a shock to the tank and have affects on the metal. Same I have been told about a hot fill then not giving it time to cool before diving. I dunno how true this is, but seems to make some sense.
As well for the cooling, opening a tank wide open to get that icing then placing a beer bottle in front of it (full of course) is a great way to get a nice cold beer quick on a hot day. Making cold beer is not a waste of air.