[PSUBS-MAILIST] Scrubber size

[Alec Smyth via Personal_Submersibles]

Hi Dave,

>From the photos, I think you've picked up the exact same carbon scrubber I
had in Snoopy. The holes are a bit big for Sofnolime, but you can easily
add a second layer of much finer mesh stitched to the inside of the
existing cylinders with fine wire. Use a donut of foam on top of the
Sofnolime to squash it down, so there isn't a path of low resistance for
the air to flow over rather than through the Sofnolime as it settles. Also,
be sure to use a radial blower, not an axial one. As for the volume, it was
perfect for Snoopy but I was diving with two people, so if you cut it in
half I think you'll be about right. I don't anticipate you'll get any
significant heating. The absorbent will get soggy and can drip, so mount it
with the blower on top to keep that dry.

Best,
Alec

On Sun, Dec 13, 2020 at 10:14 PM 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
>
> _______________________________________________
> Personal_Submersibles mailing list
> Personal_Submersibles at psubs.org
> http://www.psubs.org/mailman/listinfo.cgi/personal_submersibles
>
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://www.whoweb.com/pipermail/personal_submersibles/attachments/20201214/2854e7c5/attachment.html>