Catalina S90 - Aluminum 90s

[bigredbill]

I wasn't paying attention to scuba at the time these tanks were originally on the market but I was wondering if anyone knows much about them. The are about the same form factor as my Catalina 80s - same diameter and height - but with a rating of 3300 PSI. I recently purchased these used and they are currently at hydro, but was wondering if anyone knows the construction of these - were they simply Alum 80s that Catalina hydroed and rated to 3300, or were they of different construction - perhaps a thicker wall.

Anyone who know the facts around this I would appreciate hearing from. These are from the late 1980's btw, and seem to be in pretty good shape.

 

[TechBlack]

I wasn't paying attention to scuba at the time these tanks were originally on the market but I was wondering if anyone knows much about them. The are about the same form factor as my Catalina 80s - same diameter and height - but with a rating of 3300 PSI. I recently purchased these used and they are currently at hydro, but was wondering if anyone knows the construction of these - were they simply Alum 80s that Catalina hydroed and rated to 3300, or were they of different construction - perhaps a thicker wall.

Anyone who know the facts around this I would appreciate hearing from. These are from the late 1980's btw, and seem to be in pretty good shape.

I'm no expert on this, but i believe they have a slightly thicker wall to allow for the higher service pressure. I've heard that steel tank manufacturers use a different alloy in their hp tanks, but I don't think this aplies to alum

 

[oxyhacker]

The walls were thicker, and they were a few pounds heavier than an 80.

Also, as I recall, their actual capacity was only a tad more than 85 cf, which may have something do with why they didn't catch on. With a short fill, always a problem with tanks with oddball pressure ratings, you'd end up with just about the same amount of air as an 80!

 

[Hoosier]

It isn't common tank............

 

[drbill]

I've got one of the AL tanks rated at 3,300 psi. Use it as my second tank after I do two dives off my HP120.

 

[lakewinni]

Is it possible that it might be a compact or neutral tank as they are called. If you look at the specifications on catalina web site I believe that they have an alum 80 rated to 3300psi.