New Faber LP85's (White)

[themann]

I know the math it is not the problem, how 2 tank with the same internal water volume can have such a big difference of gas capacité at the same pressure? The math use here are an APPROXIMATION the gas have a compressivity factor at these pressure p1v1=p2v2 dosn't apply directly at the pressure in question. Ã#

For me 2 tank with the same water volume will always have the same quantity of gas of the pressure is the same.

[Superlyte27]

Um, they are BRAND NEW... so like last couple months. That haven't even arrived from Blue Steel yet... definitely late 2011

[Greenwood_60]

I know the math it is not the problem, how 2 tank with the same internal water volume can have such a big difference of gas capacité at the same pressure? The math use here are an APPROXIMATION the gas have a compressivity factor at these pressure p1v1=p2v2 dosn't apply directly at the pressure in question. Ã#

For me 2 tank with the same water volume will always have the same quantity of gas of the pressure is the same.

The math is not the problem, but it proves there is something wrong with your quoted "water volume" figures. Where did you get them?

[Shocky]

They are 242 bar tanks in EU.

[Jaydubya]

For me 2 tank with the same water volume will always have the same quantity of gas of the pressure is the same.

This statement is true for me (and everyone else since it is a basic law of chemistry). The number of moles of an ideal gas are given by n = PV/RT (where R is a constant), so two cylinders of the same volume that are at the same temperature and pressure they will have the same amount of gas.

The problem is that the two cylinders in question have neither the same volume nor the same pressure. If I recall the 85s are filled way above their rated capacity to 3600psi, while the 100s are only filled to their rated capacity, which is 3500 (or 3442) psi. I have not checked your volumes for accuracy, but I know that the two tanks do have different volumes.

[Greenwood_60]

The HP100 seems to be an LP80, not an LP85.

http://www.divegearexpress.com/library/tanks.shtml

[Superlyte27]

If you dropped an HP100 to 2640, you would not have 85cu'. You would have 77cu'
If you pushed an LP85 to 3442 you wouldn't have an HP100. You would have 110.82cu'

The internal volumes can NOT be the same.

[snakedoc]

Interested in a pair - how do I contact you? - do you take plastic?

[Superlyte27]

Interested in a pair - how do I contact you? - do you take plastic?

mccumb4@gmail.com
407-304-9288 (Peter)
Yes I take plastic.

[themann]

From Faber, internal water volume:
Faber FX100 = 787 Cubic in
Faber LP85 = 793 Cubic in

Difference = 6 Cubic in = 0,00756% volume in water

Close enough to be the same volume for me if you take in fonction the manufacturing tolerence, the HP100 can be bigger
p1v1=p2v2 is not linear at these pressure it can not be apply directly