[PSUBS-MAILIST] scrubber

[Cliff Redus via Personal_Submersibles]

Hank, don’t know all the detail on the Deepworker 2000 but will convey what
I know.  Maybe Phil will chime in with details.

The system uses his O2 bellow add valve which bleeds 100% O2 into the cabin
based on a drop in barometric pressure from the time the hatch was closed.  At
the time of launch SOP calls for them to pull a slight vacuum in the boat
to assure the hatch o-ring is sealed and to make it easier to dog the hatch
latches.  The last spec I saw on the DW 2000, the endurance is 80 hours.
There are two scrubbers (one redundant), each containing 12 lbs of SodaSorb
HP. There is also a BIBS system.  They have O2 and CO2 monitors.  The O2
bottles are externally mounted.  Since his life support endurance is 80
hours, I he should have in excess of 80 scf of O2.  I don’t know how the
Sodasorb is set up to filter, axial or radially nor do I know the type of
blower he is using in the scrubbers.  As long as the blower on the scrubber
is strong enough to circulate the cabin air through the filter every hour
or so, the 100% O2 that is blead into the cabin will mix with the cabin air
due to molecular diffusion.

I believe he uses the same basic life support system on all his boats.

Phil’s paper on Life support
http://www.psubs.org/design/lifesupport/lifesupport.pdf is a good read on
how his bellows add system work and life support in general.

When Phil let the PSub members dive his subs at the Vancouver PSub
Convention, I remember seeing the scrubbers and noting they were compact
but I was more focused on diving the DW 2000 so did not pay too much
attention to the scrubber design.
The two key things I would like to know is what is the make and model of
the blower he uses and is the filter oriented to pull the cabin air
radially or axially through the Sodasorb HP.

Cliff

On Tue, Nov 1, 2016 at 7:13 AM, hank pronk via Personal_Submersibles <
personal_submersibles at psubs.org> wrote:

> Hi All,
> Can anyone explain how the DW scrubber works?  How  is the air defused
> equally when the shape is irregular.   I want to copy the concept of a
> scrubber that fits tight to the hull to save space.
> Thanks'
> Hank
>
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