Re: [PSUBS-MAILIST] scrubbers

[MerlinSub@t-online.de]

Curasub?
vbr Carsten

<vbra676539@aol.com> schrieb:
> Launched? At last!!!
> Vance
> 
> 
> 
> 
> 
> -----Original Message-----
> From: Phil Nuytten <phil@philnuytten.com>
> To: personal_submersibles@psubs.org
> Sent: Mon, Jun 14, 2010 2:07 am
> Subject: Re: [PSUBS-MAILIST] scrubbers
> 
> 
> Alan:
> In the DW2000, only one scrubber is used at a time - it has about 40 hours before bed breakthrough. We advocate splitting the LS system into two discrete and separate systems - right from separate 02 bottles, reducers,fixed steady-flow orifice, bellows-add system, gauges (hp and lp) to separate Co2 scrubbers - that way, one whole system can go out and you still have 40 hours of LS.
>     We have monitored Co2 levels in DW and they are significantly below the allowable levels of any agency recommendations. 
>  
> We use 10 of these scrubbers in the newly launched 'Curasub'! 
> Phil
> --- Original Message ----- 
>   
> From:   Alan   James 
>   
> To: personal_submersibles@psubs.org   
>   
> Sent: Sunday, June 13, 2010 7:52 PM
>   
> Subject: [PSUBS-MAILIST] scrubbers
>   
> 
> 
>   
> To All,
>   
> While looking at various papers on CO2 scrubbers   from manufacturers
>   
> etc, I found that none addressed the unique   situation found in submarines.
>   
> Most CO2 absorbent is used in anesthetic machines   or rebreathers where
>   
> there is a closed circuit. The CO2 breathed out   goes straight into the scrubber 
>   
> & is removed. 
>   
> In our subs the CO2 is breathed out & is   diluted by the rest of the air in the   
>   
> hull & only air with a portion of the CO2 in   the hull goes through the scrubber.
>   
> This means that the CO2 level & the pressure   in the hull will progressively climb
>   
> unless the volume of air going through the   scrubber is large enough to make an
>   
> impact. The Deep Worker 2000 has fans pushing 160   liters per minute, I'm not 
>   
> sure whether this is per scrubber & whether   they have 2 scrubbers working 
>   
> simultaneously. But based on 1 fan going, that's   320 x the volume of CO2 being
>   
> produced. In the manufacturers guidelines for   scrubbers they recommend that the flow 
>   
> is at least equal   to the tidal volume of your breath (about 10 liters per minute) 
>   
> & low enough so that the air has at least 1/2 a second dwell time in the canister. 
>   
> This could be 32 x less than what Phil has worked out is necessary for the 
>   
> Deep Worker. I   know the Deep Worker has a small hull & that fluctuations in O2   
>   
> & CO2 are more critical than a K250, but possibly the same volume of flow is   
>   
> necessary to achieve atmospheric control in larger subs.
>   
> Also because of the dwell time needed the large   flow required would need large or
>   
> long canisters. Deep Worker has 2x 3.35 kg   scrubbers.
>   
> On the psub site there is reference to rebreather   cartridges as an option, but from 
>   
> what I've found you would probably need a number   of these running simultaneously
>   
> to make head way.
>   
> What are ABS recommendations? & what are   others thoughts / experiences with this.
>   
> I'm trying to sort this stuff out for   myself.
>   
> Regards Alan
>   
>  
>   
>  
> 
>  
> 




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