Tanks and weights

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scubaspider

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Pennsylvania & North Carolina
I was wandering if ne one knows the weight configurement for an average steel tank. I'm used to an AL80 and might be inheriting/using a steel tank, I dont know what size it is but i'm assuming that it is the standard/average tank size someone would buy.



Thanks for your help,


:spider:
 
The standard steel 2250 psi 72 cu ft scuba tank weighs 29.5 lbs without the valve. Bouyancy is -2.0 lbs when full and +3.5 when empty.

They also hold 71.55 cu ft at 2475psi ("+" rated 10% overfill) and 65.08 cu ft at the non-plus rated service pressure of 2250 psi.

Al 80 vary a bit by manufacturer, but on average an AL 80 weighs 31.7 lbs. Bouyancy is - 1.9 lbs when full and +4.0 lbs when empty. They also hold 77.4 cu ft , not 80 cu ft.

The following is a good link for tank specifications. They cover current production tanks as well as tanks that are no longer produced.

http://www.diverlink.com/gear/tankspecifications.htm
 
The AL numbers look ok. The steel numbers are way off.
My steel 72's (US Divers) are 5 pounds negative with valve and regulator (USD Micra/SEA) at 500 psi; my AL 80's are just under a pound positive - IOW in an "apples-to-apples" comparison there's about a 6 pound difference in buoyancy between the two.
As a practical matter, when shifting from an AL 80 to a steel 72, I take six pounds of lead off my weightbelt to achieve the same buoyancy.
Rick
 

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