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Re: [PSUBS-MAILIST] CO2 absorbant efficiency



Jon:
Probably worthwhile to note that the numbers I used were not calculated or interpolated from other data - they are actual, measured numbers taken from an extensive series of trials with the 'Newtsuit' ADS. The testing took place in a high pressure hyperbaric facility with chill tank capability. The scrubber material used was 'High-Performance Sodasorb' manufactured by Dewey & Almey Labs. The cannisters were fitted with Co2 sensors at several locations so that the absorbent bed 'break-through' could be anticipated and precisely measured. The results confirmed tests that we carried out several years previously on the Oceaneering International Inc., 'Wasp' ADS in both Farnborough and Alverstoke, UK. 
The 'Newtsuit' test reports were submitted and accepted as part of the life-support system classification by Lloyds surveyors. 
Phil
----- Original Message -----
From: Alan James
Sent: Wednesday, June 09, 2010 3:55 PM
Subject: [PSUBS-MAILIST] CO2 absorbant efficiency

Jon
Am designing my scrubbers & have come up with a discrepancy between
papers on the psub life support page.
Phils paper on life support states on page 6 that you get 4 hours (240 minutes)
per pound of soda lime.
Your scrubber design page puts it at 200 minutes per kg wich is 90 minutes
per pound (sofnalime). In other words Phils scrubber lasts about 2&1/2 times longer.
This is quite a differance if you are considering taking down enough absorbant for 3 days.
Also ( nit picking now ) Phils paper states Nasa aborts missions at 3%
CO2 levels, while yours states 2%.
Regards Alan