If you look around the neck of the Oxy cylinder you will see the dates of
the tests done every five years. If the latest date is more than five years
it likely will require testing and inspection.
Some people have been known to steel tanks off construction sites. By
not filling tanks from unknown sources it limits the incentive to steal
tanks. Larger tanks often are leased rather than sold outright. I suspect
that your tanks were leased rather than sold to your grandfather.
Randy

"Don" wrote in message
m...
My grandfather generously gave me some extra large welding tanks to
replace my little tanks. I called around here and most places said
that I needed to have an origional receipt of sale before they would
fill them. Anyone know why this is and how to get around it. I am not
sure where they origionally came from but my grandpa has had them for
years. I am sure they are not stolen or anything. All I am going to do
is use them at home for farm projects.

The place I trade my small tanks in for had to have the origional sale
from the tank manufacturer. Another place said I could just make up a
receipt from my grandpa and they would have to send the tanks out to
get refilled. (They do not exchange tanks).

What would they do if the tank is expired and is there a way I can
tell on the tank the expiration date?

Any help would be greatly appreciated!