[PSUBS-MAILIST] Life support

[Alan James via Personal_Submersibles]

Scott,
Carsten's tank size is based on a fill of 3000psi.
My dive shop will only fill O2 to 2000psi. 
Find out where you are most likely to get the tank
filled & ask what pressure they will fill to.
I had to do an O2 providers course before they
would fill my tanks.
Alan


________________________________
 From: "Carsten Standfuß " via Personal_Submersibles" <personal_submersibles at psubs.org>
To: Personal Submersibles General Discussion <personal_submersibles at psubs.org> 
Sent: Thursday, April 24, 2014 5:43 AM
Subject: Re: [PSUBS-MAILIST] Life support
 


E-Mail Software 6.0
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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