[PSUBS-MAILIST] G.L. Rules Life Support Systems

[Alan James]

Hi Joe,
ABS only requires 72 hours.
As far as waste disposal is concerned, I have heard snap-lock plastic bag mentioned.
Of course you would have to send the bag in for type approval, it would have to be made of
fire retardant materials & you would have to supply G.L. with it's material specifications,
expected life, the manufacturers name & their accreditation details.
Alan



________________________________
 From: Joe Perkel <josephperkel at yahoo.com>
To: Personal Submersibles General Discussion <personal_submersibles at psubs.org> 
Sent: Wednesday, January 29, 2014 3:51 PM
Subject: Re: [PSUBS-MAILIST] G.L. Rules Life Support Systems
 


Alan,

What type of waste disposal system is meant here? A means of disposing accumulated human waste against sea pressure? 

What did they do on the Pisces incident? 


96 hours, wow! In the back of my mind, I've figured a 12 - 24 hour response time to hopefully get a winch on you in this area. I sure hope so anyway!

Joe

On Jan 28, 2014, at 8:05 PM, Alan James <alanlindsayjames at yahoo.com> wrote:


   Life support systems need to sustain you for a minimum time of 96 hrs (4 days)
>beyond your intended mission time. This is for autonomous submersibles which
>are untethered submersibles with a boat in support. For autonomous submersibles
>like Carsten's, they require 168 hrs (7 days). 
>   Depending on the rescue concept you provide, these times for autonomous sunmersibles
>may be shortened.
>   Food, water, and the disposal of waste & effluent facilities need to be provided for the
>above times. ( the waste disposal facility needs to be able to stop the sub from stinking)
>   The O2 partial pressure needs to be kept within the range 0.19 - 0.23 bar. The CO2 pressure
>needs to be kept below 0.01 bar. Audible alarms are to be automatically set off if there is any 
>variation outside these parameters.
>   Air purifying & conditioning units are to be installed.
>   Guideline notes for life support are - O2 demand: 15 l/hr (resting); 40 l/hr working.
>- CO2 production 22 l/h (average). For tourist subs, 26.4 l/h
>   No Smoking signs needed.
>   An emergency respirator or a breathing mask which can be connected to an emergency
>breathing air system is to be provided for each crew member, in addition a reserve unit
>is required. They need to have gas tight eye protection & provide a minimum of one hour of air.
>The crew members need to be able to reach the exit still wearing these masks.
>   When travelling on the surface, the submarine is to be vented via an air mast.
>The battery ventilation system is independent from other ventilation systems.
>Natural venting may be OK for small battery plants.
>   O2 bottles in the pressure hull are limited to containing a volume that if it escaped, wouldn't
>increase the pressure by 1 atm or increase the O2 content of the air by more than 25%
>by volume.
>   Manually operated oxygen metering systems are to be equipped with a bottle shut off valve
>& a device for controlling the flow rate with a flow rate indicator.
>   If the metering device is not provided in redundant form it is to be equipped with a manually 
>operated bypass. I think this means that if the meter blocks you can switch to your extra
>meter, but if that isn't going to exist you need some way to bypass the meter.
>   The CO2 absorption unit has to be capable of keeping the partial pressure in the range of
>0.005 - 0.010 bar. At the end of your 96 hr survival time it shouldn't be more than 0.02 bar.
>   The CO2 unit needs a dust filter of non combustible material.
>   If development of H2 can be expected, the hydrogen content needs to be monitored
>continuously in the battery spaces.
>   If the hydrogen content reaches 35% of the lower explosion limit it is to be signaled audibly
>& visually at the control stand.
>   The life support monitoring equipment includes pressure, temperature, humidity, oxygen
>partial pressure, CO2 partial pressure, H2 portion, bottle pressures, outlet pressure of pressure
>reducing valves. A permanent gauge & standby indicator are required for O2 & CO2. Test tubes
>may be recognized as standby indicators.
>An analysis system has to be provided for determining atmospheric impurities.
>I think the K250 system has got a lot going for it.
>Alan
>
>
>   
>
>
>
>
>
>
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