PST Tank ID Question

[mahjong]

Another tank ID question, this one an old PST. I measured it quickly in the owner's garage so my numbers are approximate. It's ~25.25" - 25.50" tall, and ~22.25" (+/- a little bit) in circumference (a bit over 7" in diameter). Here are the engravings:

DOT - 3AA 3000 77923T PST 8 A 77 +

Anybody up on the old PST cylinders?

Thank you!

 

[rjack321]

Weird size at 3000+

Should be about 100-104cf with those dimensions/pressure. A very early "hp100" tank - they had different notions of what "hp" was back then.

 

[oxyhacker]

PST made some tanks back then that were about the same size as a steel 72, rated for 3000 psi, and held a tad less than 100 cf at 3300 psi (3000 psi plus 10% + overfil), and this sounds like what you've got. Perfectly respectable tanks, though they had a reputation for being heavy, possibly just because they were heavier than the steel 72s and alu 80s everyone was used to then. I wouldn't mind having a couple myself.

If that 8 A 77 + is the only hydrostamp, it hasn't seem much use over the years.

 

[mahjong]

Thanks! It does have a couple additional hydros on it, but it's in great shape.

PST made some tanks back then that were about the same size as a steel 72, rated for 3000 psi, and held a tad less than 100 cf at 3300 psi (3000 psi plus 10% + overfil), and this sounds like what you've got. Perfectly respectable tanks, though they had a reputation for being heavy, possibly just because they were heavier than the steel 72s and alu 80s everyone was used to then. I wouldn't mind having a couple myself.

If that 8 A 77 + is the only hydrostamp, it hasn't seem much use over the years.

 

[Texfrazer]

Lucky guy!

I used to use one of these when I would go diving with some of my friends. It was always great to look like I was diving a 72 and yet have a lot more available air as the dive progressed.

I still kick myself for not buying that tank (it was a loaner).