Mailing List Archive

Mailing List: techdiver

Message Display

To: terrym@it*.ns*.co*.au*
To: techdiver@opal.com
Subject: Re: Super HP tanks
From: <JOHNCREA@de*.co*>
Date: Tue, 12 Jul 1994 07:01:10 -0400 (EDT)

Terry,

Please realize that the gains you will get from very high pressure
tanks is going to be less than that calculated from the ideal gas
law (which, it seems, most everyone uses for calculating tank volumes
at any pressure they want to use).

Due to molecular interactions, in real world physics at very high pressures
we get less volume than predicted via the ideal gas law.
Using the Van der Waals equation of state we get the following quick
example (at 70 degrees F):

Pressure           Volume                   Volume
(PSIG)             Ideal Gas Law            Van der Waals

 1000               68.05                     71.13
 2000              136.09                    143.55
 3000              204.14                    207.14
 4000              272.18                    257.10
 5000              340.23                    295.33
 6000              408.28                    325.14
 7000              476.32                    349.06
 8000              544.37                    368.77
 9000              612.42                    385.39

These calculations were done on a 1 liter tank, with resultant volume
expressed as delivered gas in liters.

John
Submariner Research, Ltd.
(johncrea@de*.co*)

Navigate by Author: [Previous] [Next] [Author Search Index]
Navigate by Subject: [Previous] [Next] [Subject Search Index]

[Send Reply] [Send Message with New Topic]

[Search Selection] [Mailing List Home] [Home]