[PSUBS-MAILIST] Life support

["Carsten Standfuß " via Personal_Submersibles]

Hi Sean, 

in praxis we use 0,25 l/min or (0,25 x 60=) 15 L/h O2 per hour and
person. 
15 l/h x 72  h = 1080 Liters. Divided by a pressure in the bottle of 200
atm. is a 5 Liter bottle per person for emergency storage only. 

This is close to the GL figure for resting person. 

But if you are in a emergency 72 hour situation one person will rest and
all other sleep..
So on more than one person sub the figures over 72 hours will be lower.


By the way -if I am in Sgt.Peppers the flowmeter is some what by 0,2
L/h.. 

Emile can give you actual flowmeter figures for a three person sub. 

vbr Carsten   - "If you are not sure - double it.." (unkown submarine
engineer) 


"Sean T. Stevenson via Personal_Submersibles"
<personal_submersibles at psubs.org> schrieb: 
According to the ABS rules, per (11/35.3), you need sufficient oxygen
for the mission duration PLUS the 72 hour reserve.

Per (8/7.1), oxygen:  0.038 kg (0.084 lb) per hour, per person, at 1
atm.

x 72 hours emergency duration = 2.736 kg (6.032 lb) per person for 72
hours.

2.736 kg x (1000g/kg) x (mol O2/31.9988g O2) x (22.4 liters / mol O2) =
1915 liters (@ STP, ideal gas assumptions)

= 68 cubic feet oxygen per person for emergency reserve, additional
oxygen appropriate to mission duration.

Sean



On 2014-04-22 17:52, swaters via Personal_Submersibles wrote:

I have been trying to make sure I have suffecent life support for 72
hours per ABS. It seems like the research varys a little. 
I am showing
*80 cubic feet of O2 per person
*23 lbs sodasorb per person


Is this right?
Thanks,
Scott Waters
 
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