[PSUBS-MAILIST] scrubber performance

[hank pronk via Personal_Submersibles]

I think I will use my re-breather scrubber from Gamma in Elementary 3000 and make a new scrubber the way you describe for Gamma.  The re-breather scrubber works fine for one person.Hank 

    On Monday, August 15, 2016 7:54 AM, Sean T. Stevenson via Personal_Submersibles <personal_submersibles at psubs.org> wrote:
 

 Just to add to Cliff's comment, you will get the most even consumption of scrubber media in a radial scrubber when the flow is from the outer diameter to the inner diameter.  The flow velocity is slower at the greater diameter, so you want to expose the unscrubbed gas there first, so the CO2 concentration across the media lessens as the flow velocity increases at the inner diameter. Fortunately, this embodiment easily accommodates a squirrel cage fan drawing gas from an inner core.Sean

On August 13, 2016 8:30:51 PM MDT, Cliff Redus via Personal_Submersibles <personal_submersibles at psubs.org> wrote:
Your scrubber meets ABS rules which requires the CO2 concentration to stay below 5000 ppm (1/2%) .  From my own experience, I found that the type of fan and the flow orientation makes a big difference in how low the scrubber can pull the CO2 concentration down to.  Specifically, squirrel cage blowers work better than axial fans and radial flow works better than axial  flow through the Sodasorb HP.
I am proud of your mom.  
Cliff


On Sat, Aug 13, 2016 at 3:23 PM, hank pronk via Personal_Submersibles <personal_submersibles at psubs.org> wrote:

Hi All,I just did a two person life support test and the CO2 level sits around 4,000ppm  and the O2 flow is at .5 lpm   Is that CO2 level high?   When I am in the sub alone it sits around 2,500ppmI am getting Gamma all geared up for a big dive with my mother as the passenger, that means a ladder, comfy seat, hot coffee, cookies.  She is very excited!Hank
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