Second hand cylinder

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Daznat - 16 Oct 2007 19:47 GMT

Hi

I've just bought a second hand cylinder and I have a few question I'm
hoping someone can answer.

The cylinder is a 12.2 liter which has been O2 clean and was used for
nitrox, what I'll like to know, will there be any problem filling this
tank with normal air as that's all I want to use it for.

The cylinder had a Nitrox sticker on it which I've remover, and its the
old yellow colour, it has been hydro test this year, and has all the
right sticker, and stamps on it, will I need to replace the nitrox
sticker with anything else.

How often will I need to test the cylinder and what will it need testing
for, currently it doesn't need to be tested till 2009.

One final point, how long can a cylinder be filled with air before, that
air is not usable or doesn't matter.

Thanks for any help.

Darren

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Nigel Hewitt - 17 Oct 2007 08:40 GMT

> The cylinder is a 12.2 liter which has been O2 clean and was used for
> nitrox, what I'll like to know, will there be any problem filling this
> tank with normal air as that's all I want to use it for.

Nope. Nitrox clean is a higher specification.

> The cylinder had a Nitrox sticker on it which I've remover, and its the
> old yellow colour, it has been hydro test this year, and has all the
> right sticker, and stamps on it, will I need to replace the nitrox
> sticker with anything else.

Leaving the sticker on would have been a better move. Somebody may now
try to charge you for a 'Breathing Air' sticker.

> How often will I need to test the cylinder and what will it need testing
> for, currently it doesn't need to be tested till 2009.

Hydrostatic test every 5 years. Visual inspection at the mid, 2.5 year, point.
Don't leave the Visual late or they have to hydro it as the hydro must be in
five years and ther is only one mark.

> One final point, how long can a cylinder be filled with air before, that
> air is not usable or doesn't matter.

Comperable with the geological age of the earth.
Air is air. Stick to the usual test sequence and you have no worries.
I measured air from a 1976 cylinder and it read just the same as the
stuff in my celler. Admittedly I didn't have the nerve to refill it.

nigelH

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jazzie129uk@yahoo.com - 17 Oct 2007 10:21 GMT

> Hi
>
[quoted text clipped - 19 lines]
>
> Darren

If you're refilling it with air then the only thing that will matter
is whether or not it's in test. The filling station will check the
date stamp on it so providing you have that then you should be ok.

In the UK testing needs to be done every two and a half years
alternating between hydro tests and visual tests. This routine may
vary if you live in another country, although I'd be surprised if it
was any different in the rest of the EU. There's no reason why you
can't use a tank previously filled with nitrox for air. If going the
other way round then the tank would have to be cleaned suitable for
nitrox use before being filled (which is where the sticker that you
removed has come from).

As far as I'm aware there's no use-by date on air. Anyone else?

hth
danny

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David Owens - 17 Oct 2007 20:14 GMT

>> One final point, how long can a cylinder be filled with air before, that
>> air is not usable or doesn't matter.

as far as I know - doesn't matter. Best do a taste test first though
diowens@bluebottle.com

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marcin dobrucki - 18 Oct 2007 07:49 GMT

> In the UK testing needs to be done every two and a half years
> alternating between hydro tests and visual tests. This routine may
> vary if you live in another country, although I'd be surprised if it
> was any different in the rest of the EU. There's no reason why you

Going slightly off-topic... yes, its different. At least in Finland
tanks need to be inspected every 10 years, and yes, that includes
aluminium tanks as well. BTW, hydrotesting alu tanks is not healthy for
them, as aluminium does not return to its form after being stretched at
testing pressure.

/m

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