US Divers, steel 72

[ChrisA]

Anyone have the exact specs on this tank? Here is what I know about it:

US Divers, steel 72. It was made July 1968. Pressura is 2250 It is galvanized under the paint.
It has brand new hydro but I've yet to dive with it.

I'm curious about it's buoyancy when empty in salt water. (Yes I know I could buy a fish scale and weigh it underwater but posting here is easier.) Looks like it might be neutral. These were very common tanks, I'm sure someone remember

 

[DA Aquamaster]

Steel 72's are about 4 lbs negative when full and around 1 lb positive when empty. There were several manfacturers who made steel 72's so the specs for a "standard" steel 72 actually varied slightly.

Capacity is normally 71.2 cu ft at 2475 psi (10% overfill) and 64.7 cu ft at the service pressure of 2250 psi.