Another Cylinder ID Thread

[Pedro Burrito]

I have two old steel cylinders. Both within hydro and vis.

The top line of stamps: DOT-3AA2250
The second line of stamps for tank A: HJ 337584
The second line of stamps for tank B: HJ 337622

The first hydro stamp: 1 (a diamond with some small markings) 74+

The length without valve is 24 3/4 inches and the width is 7 inches.

Any ideas about the volume and neck valve size? I can drain the tank and remove the valve to get the valve size but I wanted to order a left and a right valve first to use these tanks for sidemount.

Thank you.

 

[shermen]

Sounds like a 72, not sure about the valve threads.

72 cu ft
Service pressure: 2250 psi
Working pressure: 2475 psi (2250 psi +10%)
Actual air capacity: 71.2 ft3 (at a working pressure of 2475 psi)
Outer diameter: 6.9 in
Length without valve: 25.1 in
Empty weight: 26 lbs (w/o valve)
Buoyancy Empty: 0 lbs (w/valve)
Buoyancy Full: -5.4 lbs (w/valve)

 

[Katch]

The first hydro stamp: 1 (a diamond with some small markings) 74+

That means it was first hydro'd in January of 1974 to a plus 10% capacity. The latest hydro should also have the "+" after the date, or it cannot get filled to the +10%

 

[Culcuhain]

you will like those tanks a lot!

 

[Paladin]

Those are Healthways 72 cubic foot steel tanks. The necks are standard 3/4". They were made by Norton. I have some and I really like them. They have great buoyancy characteristics.

 

[captain]

Made by Norris, Norton was Ralph Cramdon's friend. The thread is 3/4 straight. Great tanks.

 

[Paladin]

Oops! You are correct, Captain. They were made by Norris. Why did I say Norton? I know better!

 

[mike_s]

those would make a nice set of small doubles.

 

[Paladin]

those would make a nice set of small doubles.

I had a set of Healthways double 72s. They are great underwater.

 

[Pedro Burrito]

Thanks so much for the responses. I took the two tanks in to my LDS for VIPs and new valves. Just as captain said, the valves were the standard 3/4". The insides of the tanks looked clean with some minor surface rust. It's amazing how well those tanks were built, 38 years old and it looks like plenty of life left in them.