View Full Version : Age of Aluminum tanks

08-29-2009, 15:59
I am thinking of buying some used AL80's ... I know I would need a vis/hydro, but is there a certain age of tanks I should not go past?

08-29-2009, 16:15
Do a thread search; you'll find a lot of info. The tanks made from 6351 alloy are problematic; so, avoid tehm.

08-29-2009, 17:09
As Vercingetorix said, there are a lot of threads on it, do a search for 6351 alloy.

In short, a luxfer tank that was made before 7/88 is the older 6351 alloy that has been linked to a number of catasrophic failures and a lot of shops won't fill them anymore. Catalina tanks are good to go-never made with 6351

Some info to read: Luxfer: Sustained-load Cracking FAQ (http://www.luxfercylinders.com/support/faq/sustainedloadcracking.shtml)

08-29-2009, 17:53
Due to various misconceptions, a lot of shops won't fill aluminum tanks built before 1990 (some don't even know the difference between Luxfer... which used the problematic alloy at one point, and Catalina, which never used the problematic alloy).

So my feeling is let someone else have the arguments. There are plenty of used tanks out there made since 1990, so there's no need to buy one that's practically guaranteed to cause issues at some point, whether those issues are caused by ignorance or not.

08-30-2009, 02:14
Like they said above anything before 1990 just to be safe.

09-16-2009, 11:49
Yeah....to be safe...stay clear of anything made before 1990.
I have 3 such tanks and have to drive an extra 30 minutes to a shop that WILL fill them.
Oddly enough, none are 6351 Luxfers.
2 are Luxfer AL80's but were made after they switched over from 6351 alloy and the other is a nearly brand new (but old stock) U.S. Divers Professional.

09-16-2009, 11:51
Did I say "Just to be safe"?
I meant...just to avoid the hassle.
Nothing unsafe about my tanks.
They recently passed Hydro, eddy and vis.....and still the local shops won't fill them.
That's OK though. My $$$$ spends just fine elsewhere.

09-16-2009, 16:17
That's OK though. My $$$$ spends just fine elsewhere.

I would cut them slack. It's not a standard, but it's nearly so on those old AL cylinders. My LDS will fill them if he is the one who hydro's and does the visual inspection. He knows and trusts his work, not sure if he'd fill them for others though.

Still, for the trouble they cause getting fills, I'd get newer ones and avoid the hassle.