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David,

I watch my tanks in the fill bin to determine exaclty where they shift 
to positive. 1100psi is where they stop floating and lay on the bottom 
of the tub.

As far as charts go, i ask myself two questions: who provided the chart 
and how does it profit them.

Marv

David M. Thiesfeld wrote:

> Guys,
> One of the things I see missing from your discussion is how much the tanks
> buoyancy changes from full to empty. Look at the abyss tank chart and you
> will see the PST 104 has a change of 4.6 lbs vs. 5.9 lbs. for the Luxfer 80
> (77), now double those numbers and look at the weight difference needed.
> 
> http://www.abysmal.com/pages/features-cylinders.html
> 
> Also from looking at this chart I'd say that the Luxfer 80's are going to
> start swinging positively buoyant closer to 2000 psi than 1100 psi. A
> doubles manifold may push it down some but not that much.
> 

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