Re: Pressure to Vol and Wgt problem

On Jun 9, 6:25 am, PD <TheDraperFam...@xxxxxxxxx> wrote:
On Jun 8, 4:51 pm, 910...@xxxxxxxxx wrote:

If this is not the group for this, I apologize.

I have a measured pressure (in PSI) of a horizontal cylindrical tank
of liquid CO2 at a water plant that I am trying to convert to mass
equivalent in lbs.

The tank's rating at max capacity is 17,645 gallons, or 2,359 cu. ft.

The spec'd nominal weight contents (full) is 140,000 lbs.

Now, I know the density of the CO2 is 12.67 lbs/gal. But doing the
math, at full capacity, that hardly equals 140,000 lbs.

Hmmm. I looked up the density and found 1032 kg/cubic meter, which
translates into 8.61 lbs/gal. Your density value seems on the high
side. I admit that I was suprised to find that liquid density varies
quite a bit, from 1032 kg/c.meter at -10 F (refrigerated) to 762 kg/
c.meter at 70 F (room temperature cylinder)

Using the refrigerated number, 17,645 gal x 8.61 lbs/gal = 152,000
lbs.

This is still a little above the rated capacity of the tank, which
could mean that the tank is warm, not refrigerated (a lower density
than I used), or that there is a vapor head required to accommodate
temperature fluctuations without catastrophic pressure fluctuations.



What am I missing here?

How do I convert this PSI measurement to lbs?

This depends strongly on the temperature of the tank.
Look up the MSDS for carbon dioxide and you will find a pressure vs
temperature curve for a saturated mix.





Thanks in advance.- Hide quoted text -

- Show quoted text -

Large CO2 storage tanks are typically non-refrigerated, so tank
capacity is probably computed at a mean annual surface temperature,
which would result in a density somewhere between the two values that
you mentioned, and could therefore result in a tank capacity
approaching the 142000 lb figure that was originally quoted.

s/KAM


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