Mailing List Archive Mailing List Archive
Capitan,
You may download a demo version of GASMIX 5.0 on Cobb's Trimix page. It's
not a full version, but you will find the compressibility (Z) factors for
He, O2 and N2 there for any pressure. As you see, Z may be below or above
unity, depending on type of gas and pressure. A fudge factor to compensate
for compressibility factors may thus not always work. The reason it works
anyway is probably because the main thing to compensate for is temperature
(hotfill), and not compressibility factors.
I've enclosed a listing from GASMIX, for Trimix 18/50, 2640 and 3500 psig,
for both Ideal and Real gas. The "Real gas" gas model should be
theoretically most accurate.
-b-
******************************************************
* *
* Trimix from Helium + Oxygen + Air *
* *
******************************************************
Gas Model = Ideal Gas
Narcotic Oxygen = No
Registred User = Bjorn Forshei
Filling Data...
Goal contents : 18.00 [%] O2
50.00 [%] He
32.00 [%] N2
2640.00 [psi]
The bottle to be filled is empty
Filling Sequence : Helium -> O2 -> Air
HELIUM fill pressure : 1320.0 [psi]
Intermediate O2 cont.: 0.00 [%]
OXYGEN fill pressure : 1572.0 [psi]
Intermediate O2 cont.: 16.03 [%]
AIR fill pressure : 2640.0 [psi]
Final O2 contents : 18.00 [%]
You have now mixed Trimix : 18.0 / 50.0
******************************************************
* *
* Trimix from Helium + Oxygen + Air *
* *
******************************************************
Gas Model = Real Gas
Narcotic Oxygen = No
Registred User = Bjorn Forshei
Filling Data...
Goal contents : 18.00 [%] O2
50.00 [%] He
32.00 [%] N2
2640.00 [psi]
The bottle to be filled is empty
Filling Sequence : Helium -> O2 -> Air
HELIUM fill pressure : 1319.5 [psi]
Intermediate O2 cont.: 0.00 [%]
OXYGEN fill pressure : 1557.3 [psi]
Intermediate O2 cont.: 16.03 [%]
AIR fill pressure : 2640.0 [psi]
Final O2 contents : 18.00 [%]
You have now mixed Trimix : 18.0 / 50.0
******************************************************
* *
* Trimix from Helium + Oxygen + Air *
* *
******************************************************
Gas Model = Ideal Gas
Narcotic Oxygen = No
Registred User = Bjorn Forshei
Filling Data...
Goal contents : 18.00 [%] O2
50.00 [%] He
32.00 [%] N2
3500.00 [psi]
The bottle to be filled is empty
Filling Sequence : Helium -> O2 -> Air
HELIUM fill pressure : 1750.0 [psi]
Intermediate O2 cont.: 0.00 [%]
OXYGEN fill pressure : 2084.1 [psi]
Intermediate O2 cont.: 16.03 [%]
AIR fill pressure : 3500.0 [psi]
Final O2 contents : 18.00 [%]
You have now mixed Trimix : 18.0 / 50.0
******************************************************
* *
* Trimix from Helium + Oxygen + Air *
* *
******************************************************
Gas Model = Real Gas
Narcotic Oxygen = No
Registred User = Bjorn Forshei
Filling Data...
Goal contents : 18.00 [%] O2
50.00 [%] He
32.00 [%] N2
3500.00 [psi]
The bottle to be filled is empty
Filling Sequence : Helium -> O2 -> Air
HELIUM fill pressure : 1723.2 [psi]
Intermediate O2 cont.: 0.00 [%]
OXYGEN fill pressure : 2031.8 [psi]
Intermediate O2 cont.: 16.03 [%]
AIR fill pressure : 3500.0 [psi]
Final O2 contents : 18.00 [%]
You have now mixed Trimix : 18.0 / 50.0
--
Send mail for the `techdiver' mailing list to `techdiver@aquanaut.com'.
Send subscribe/unsubscribe requests to `techdiver-request@aquanaut.com'.
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]