Faber Steel Tanks

[krawlings]

nimoh you beat men to the explanation . but you did a better job explaining than I would have explained and I learned some thing too
I did not know how that tanks in metric where measured in water volume. I guess we all learned some thing
THANK YOU

Originally Posted by novasquid
it has nothing to do with metric versus imperial. i think you're making the wrong assumption that both tanks have the same volume. if two tanks have the same capacity (100cft) but with different psi, then the tank with the higher psi will be smaller compared to the other tank. for an extreme example, imagine how large a tank would have to be to hold 100cft of air at one psi.



"I think it is related to metric vs. imperial, since in the metric system, tank capacity is normally given in internal (water) volume, which I think is where the confusion is coming from."

 

[lowviz]

...//... the internal volume is not commonly used in the imperial system. ...//...

For good reason. We like some arbitrary reference pressure, some defined but unstated temperature, a cylinder's +10% volume rating, and assume a perfectly compressible gas. Now we can get anything we want with a pressure gauge.

Stating an internal volume and a maximum working pressure is just too complex to wrap one's head around...

 

[NAM001]

YES IT IS OK

PV=PV PRESURE VOLUM = PRESURE VOLUMN = CVAPACITY = Metric makes these calculations much easier than imperial


THIS ALSO MEANS THAT 12L AT 232 ALSO EQUALS CLOSELY 15L AT 185 BAR OR A 30L (TWIn 15 LTR)AT 93 BAR
looking at a al80 (or al77) it is 200 bar tank with a volumn of 77/200 .38 cuft vol tank * 28 or roughly 11 ltr tank.

for every 10 bar of air you breath you are consuming 110 ltrs of gas

on 15 ltr tank 10 bar is 150 ltr of gas
on a 18 ltr tank it is 180 ltr of gas per 10 bar.

if you look at the reverse of this

tha al 80 10 ltr of gas is .8 bar cyl vol is 12lt
the lp100 10 ltr of gas is .6 bar cyl vol is 12lt 15 ltr
the 100 hp .8 ltr of gas is .8bar cyl vol is 12lt 12 ltr

all different combinations of tanks vol capacity and wp

Thanks for the explanations, I believe I now have a better understanding. Would it then be accurate to say that 1cft = 28.23liters of air?

100cft would then roughly translate to a 12l 232bar cylinder?

 

[lowviz]

...//... Metric makes these calculations much easier than imperial ...//...

Well, yes. But then there is nothing left to argue about if you only have a true internal volume and a maximum working pressure.

 

[Ludicrous Depth]

OK, so here's the skinny. All 5 steel tanks plus the pony passed hydro and vis. In addition, I asked the cylinder company that was doing the hydro to do a plus rating and all 5 now have the + stamp. So which ones should I keep and which should I sell. By the way, they were two 85's instead of the 68's, and what would be fair asking prices?