old steel 72 buoyancy specs.
- Thread starter hydro212
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The one I measured (with a USD Micra/SEA attached) is 5 pounds negative with 500 psi in it, just under 9 pounds negative full. (That would make it just under 4 pounds negative if completely empty - the valve itself is nearly a pound negative, and the SEA a couple, so just the tank is probably just about one pound negative when empty) The others seem to be the same.hydro212:
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They vary slightly as they were made by several manufacturers, but most of mine seem to be very slighty negative (about 1 lb negative) in the water with the valve attached with 500 psi. I have one noteable exception with one steel 72 out of the 20 or so I own being 3-4 lbs negative when empty.
captain
Contributor
I have 7 of them and at 500 psi with regulator attached they barely float in sea water.
Good point. I should have added I normally dive fresh water, which probably accounts for much of the the difference between barely floats and slightly negative.
mech
Contributor
Not what you asked for but I need exactly 2 more lbs when diving one of my old 72's instead of my 95 fabers to do my safety stop.
YMMV
YMMV
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