Breeding tanks again!! Damn it!!! … and a question about one of them.

[Eric Sedletzky]

So, I was given a bunch of tanks for our urchin removal campaign. I’m going through them now to see what’s usable and what is not.
I was going to make a joke about leaving two tanks alone in the garage overnight and coming out in the morning and finding this:

So what we have is the first group closest is 5 steel 72’s, 4 of which are HDG and one vinyl dipped. The beat up yellow one in the middle is HDG, somebody just sprayed cheap yellow paint on it and it’s flaking off. I haven’t looked inside any of them yet.
The far group is a bunch of bad alloy aluminum tanks and they all will go to recycle.
The two in the middle are also aluminum, one is a Luxfer 01-90 so it’s good and the other one is an oddball. It’s an aluminum but it’s skinnier than 7-1/4” it’s more like 6.9” like a 72.

You can see the stampings.
There’s no brand name stamp and a special permit number 6498. Maybe someone can help me out with this one?

 

[Scared Silly]

It is the original SP6498 made from AL6531. The SP6498 later became the 3AL standard. When the 3AL standard came to be the SP6498 was defunct thus the requalifier legally restamped them as 3AL. Shuffle it over to the other scrap six.

 

[Eric Sedletzky]

Junk

 

[happy-diver]

Wow not a bad system, do you think you could send me over a crate of breeding pairs of purple urchins

Will paypal work?

 

[Scared Silly]

FWIW I had to do some searching but that USD cylinder was made by Alcan.

And here is a link about the SP6498 being restamped 3AL

 

[Endler's]

How do you feel about J-valves? Lots on your keepers. Could swap out, for a few more modern looking valves on rejects. (What about burst disks?)

 

[rx7diver]

How do you feel about J-valves? ...

J-valves continue to have a lot of utility, IMHO. For example, in situations where you won't be able to read a SPG (and you don't have a SP Mk 7). I recently acquired my newest-to-me J-valve, an old U.S. Divers pillar valve, a couple of months ago, to dive with my DH reg for shallow, solo dives here in southwest MO.

rx7diver

 

[rx7diver]

(Duplicate.)

 

[rx7diver]

(Duplicate.)

 

[Scuba Lawyer]

That's an aluminum 72 cu. ft. tank. I never knew why USD sold them but they are in early 1970's US Divers catalogs. As I recall, I didn't like the bouyancy characteristics but it's been so long now that I forget what the problem was.