On Dec 1, 2007 7:26 AM, John T. Blair <jblair1948@cox.net> wrote:
>
>
> I have no idea of what they weigh empty or full. But they sure are heavy!
>
If you look at the neck of a gas bottle, there are a bunch of numbers. One
of them will be something like TW 46.8. That's the tare weight, in lbs.
If it's an old cylinder, it may just be an unmarked number. If it's a
newish cylinder, it's likely to also have the tare weight in kilograms.
There will be a number, starting with DOT or ICC, which tells the type
of tank, its maximum service pressure, and other things --
something like DOT3AAA2265, which means a plain steel tank rated for
2265 psi. (There are some newer classes of tank where it's listed in
bar.) There's a serial number, which is pretty meaningless to us.
Then there are bunch of dates. They're in the format Month Tester's
mark year endorsements. So you'll see something like 12 X 07 + *.
That would be a cylinder tested December 2007 by the owner of the
symbol X. (They're often a bunch of leters and numbers on two rows.
They mean things to DOT, but not me.) The plus sign means the tank is
certified for 10% over filling (to 2500 PSI in this case, then). The
star means that it's only necessary to test the cylinder every ten
years, instead of five. (provided a bunch of requirements are met,
but that's the filler's problem, not the users.)
Acetylene cylinders usually have water capacity stamped, as well.
--
David Scheidt
dmscheidt@gmail.com
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