[PSUBS-MAILIST] Scrubber size

Mon Dec 14 19:41:35 EST 2020

Cliff, thanks. Thats the same as I purchased. Where did you source your
radial fan?  Wyvonne laughed when I told her I would be sitting in the sub
for 12 hrs like Cliff. Here first response was can't you find someone to
trade places 1/2 way through? LOL I will look into that other scrubber
material.

Best Regards,
David Colombo

804 College Ave
Santa Rosa, CA. 95404
(707) 536-1424
www.SeaQuestor.com

On Mon, Dec 14, 2020 at 8:08 AM Cliff Redus via Personal_Submersibles <
personal_submersibles at psubs.org> wrote:

> David, the scrubber on the R300 holds 3.5 lbs of SodaSorb HP.  The longest
> I have been submerged was 12.5 hours during a pool test.  The longest I
> have been submerged for a normal dive event is 5 hours at one of the
> Islamorada PSub conventions.  My NOP is to discard partially consumed
> absorbent at the start of each dive day regardless of how many hours used
> and refill.  I keep spare absorbent in sealed bags onboard sufficient to
> last 80 hours (8 hours normal dive time plus 72 hours emergency time).  Due
> to W.R. Grace, the manufacture of SodaSorb HP, stopping manufacturing of
> this CO2 absorbent, I have switched to DiveSorb Pro from Dragger.  I have
> no experience with the new absorbent but plan on doing some shop testing
> prior to my next dive.  If you are interested, I have a report on my life
> support system where I have documented the system as well as all testing.
>  If you are interest, I would be glad to send it to you if you will contact
> me off list.  The scrubber design I used is based on the scrubber in
> Snoopy.   It is a radial flow charcoal filter container with a blower that
> discharges the clean air from the top.  After I got the right blower speced
> for the unit, the scrubber has worked great.
>
> The filter container is 6" OD x 7-1/2" height, with 4" ID for annulus that
> contain the absorbent.  The one I use is like iPower 4" 6" 8" 10" 12"
> Inch Air Carbon Filter Virgin Charcoal for Inline Fan | eBay
> <https://www.ebay.com/itm/iPower-4-6-8-10-12-Inch-Air-Carbon-Filter-Virgin-Charcoal-for-Inline-Fan/151039619541?_trkparms=aid%3D1110006%26algo%3DHOMESPLICE.SIM%26ao%3D1%26asc%3D20200520130048%26meid%3D94db0d56ef7f488684c04841973fb840%26pid%3D100005%26rk%3D1%26rkt%3D12%26mehot%3Dpf%26sd%3D381842163004%26itm%3D151039619541%26pmt%3D1%26noa%3D0%26pg%3D2047675%26algv%3DSimplAMLv5PairwiseWebWithDarwoV3BBEV2b%26brand%3DiPower&_trksid=p2047675.c100005.m1851>
>
> $32.99
> iPower 4" 6" 8" 10" 12" Inch Air Carbon Filter Virgin Charcoal for Inlin...
>
> Professional grade filter that will handle the nastiest odors produced by
> the prettiest plants. 【Durability】 iPo...
>
> <https://www.ebay.com/itm/iPower-4-6-8-10-12-Inch-Air-Carbon-Filter-Virgin-Charcoal-for-Inline-Fan/151039619541?_trkparms=aid%3D1110006%26algo%3DHOMESPLICE.SIM%26ao%3D1%26asc%3D20200520130048%26meid%3D94db0d56ef7f488684c04841973fb840%26pid%3D100005%26rk%3D1%26rkt%3D12%26mehot%3Dpf%26sd%3D381842163004%26itm%3D151039619541%26pmt%3D1%26noa%3D0%26pg%3D2047675%26algv%3DSimplAMLv5PairwiseWebWithDarwoV3BBEV2b%26brand%3DiPower&_trksid=p2047675.c100005.m1851>
>
>
> [image: Inline image]
> I am a big believer in shop life support tests so that you know the actual
> performance limits of your life support system.  I would encourage all
> phubbers to do this qualification work prior to normal dive operations.  It
> is actually a lot of fun to conduct these test.  I find there has been no
> problem in getting volunteers for these life support test which need to be
> done in a controlled environment for safety purposes.
>
> On Sunday, December 13, 2020, 09:14:10 PM CST, David Colombo via
> Personal_Submersibles <personal_submersibles at psubs.org> wrote:
>
>
> Hi Guys, I was following Jon's thread and thought how appropriate.  I am
> building a scrubber for the VAST sub. The housing I acquired was a carbon
> filter used in the grow industry.  With an interior screen core for the air
> to flow thru to the sodasorb core to the outside screen. The volume of this
> space holds 3.6 lbs of carbon. Not sure if the weight per volume of the
> sodasorb is exactly the same, but if it is that chamber would produce about
> 14.4 hours of absorption. I'm am thinking that I am going to cut the unit
> in half. My thinking is that for a typical day of diving, 14 hrs seem a bit
> excessive and I would be wasting  a lot of sorb.  With pre packaged,
> vacuumed bags I can carry what would be required to meet ABS guidelines.
> One of my concerns though is that with the compactness of the VAST sub with
> a reduced volume of sorb, would the heat generated be greater than with
> more sorb, thereby also increasing the humidity buildup.
> I am hoping to get some experience feedback from other small owners, and
> what they have used volume wise of the sorb for a typical day of diving.
> The co2 unit I am using measures humidity as well as co2 ppm.
> Attached are pictures of the unit ready to have the fan attached.
> Best Regards,
> David Colombo
>
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