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Re: [PSUBS-MAILIST] open source scrubber design



Title: Re: [PSUBS-MAILIST] open source scrubber design
Hi again Emile,
You are correct when querrying the "200lb of chalk", it was acknowleged that the  figures were wrong
some time ago but looks like they haven't been changed. Even Cliffs 30lb for 80hrs seems steep.
I'm working on 1kg lasting 9 hours. Below is an email from Phil on scrubber design for the DW2000.
 
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 -----
Sent: Monday, March 14, 2011 4:52 AM
Subject: RE: [PSUBS-MAILIST] open source scrubber design

Thanks Jon,

 

You wrote a nice document about life support. I only prefer a radial blower cos the axial blower blades stall easy when the pressure rises.

In fact a scrubber is very simple but making a high efficient and practical one needs some research.

 

The claimed efficiency of extendair is a point: A 72 hour life support for 3 person needs some 200 Lbs of Chalk!

 

Emile

 


Van: owner-personal_submersibles@psubs.org [mailto:owner-personal_submersibles@psubs.org] Namens Jon Wallace
Verzonden: zondag 13 maart 2011 15:59
Aan: personal_submersibles@psubs.org
Onderwerp: Re: [PSUBS-MAILIST] open source scrubber design

 

 

Emile,

Forgot to mention we have two design documents on our web site that you
should look at.
www.psubs.org -> Resources & Reference -> Design Tools -> Life Support

Jon




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