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

[Joe Perkel]

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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