so 1100 psi in the 80cuft tank means 29.3 cuft of gas inside and it 
weighs 2.4 lbs and thus shifts from float to sink. And of course the 80 
is really what 77.4 so 1100psi means 28.38 cuft of gas inside or a 
weight<mass?>of 2.27lbs

In other words if you watch the fill panel gauge as the tanks fill, it 
will sink when it gets to um say 1100 psi???? or are we going to now 
factor in the weight of the fill whip end on the tank??

Marv

William Hulik wrote:

> Air weighs 8 hundreths of a pound per CuFt.  I 100
> CuFt tank will change by 8 pounds.  An 80CuFt tank
> will change by 6.16 pounds (77 X .08 = 6.16)  Volume,
> and pressure (1000 psi vs 2640 psi vs 3500 psi) has
> nothing to do with it.  100 CuFt weighs the same at
> 2640 psi as it does at 3500.
> 
> Bill 
> --- Marv <ajmarve@ba*.ne*> wrote:
> 
>> 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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