[PSUBS-MAILIST] charcoal filter

[Antoine Delafargue via Personal_Submersibles]

Hi Alan
you are right,
Emile is a good ressource too. He made my scrubber, using radial (not
axial) fans, which are better handling back pressure.
I also made my scrubber fatter than Emile's original design, to reduce
delta P, and allow for this extra charcoal back pressure, or to put my two
scrubbers in series.

the other thing is, when not doing much exercize in the sub, and without
the extra charcoal filter, I can put 12V through the fan in one or both
scrubbers, instead of 24V. this way the load and noise go down a lot. and
CO2 not much up.

regards
Antoine

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On Tue, Sep 19, 2017 at 10:04 PM, Alan via Personal_Submersibles <
personal_submersibles at psubs.org> wrote:

> Antoine / Hank,
> with the comments about the scrubber fan slowing down you got me
> thinking about the load on the fan motor. It would be interesting
> to test the amp draw under normal operation, attached to the scrubber
> & with extra filters. It is a critical piece of equipment & we may be
> loading
> some of these fans beyond what they are designed for!
> I am not saying we are, but it is something I hadn't considered.
> Cheers Alan
>
> Sent from my iPad
>
> On 20/09/2017, at 6:28 AM, Antoine Delafargue via Personal_Submersibles <
> personal_submersibles at psubs.org> wrote:
>
> I did not upgrade the fan but indeed noticed the flow rate dropped a bit
> I used a short pvc pipe (water collection type) 200mm diam i
> think, with end caps on each end (each male side glued in the pvc section,
> female side just screwed by hand to open/close (few dollars at dyi store)
> lots of 10mm holes in both end caps
> And scotchbrite filters (kitchen sponges/scrub) against each end cap to
> hold charcoal in
> I had actually made a small oxygen rebreather scrubber to hold the
> sodalime with that same cheap method.
>
> Antoine
>
> On Tuesday, September 19, 2017, hank pronk via Personal_Submersibles <
> personal_submersibles at psubs.org> wrote:
>
>> Hi Antoine,
>> Did you have to up size the fan or are you on lung power only?   I will
>> put a charcoal filter on just because it seems practical and it is pretty
>> cheap.
>> What did you use for the filter?
>> Hank
>>
>> On Tuesday, September 19, 2017, 11:37:02 AM MDT, Antoine Delafargue via
>> Personal_Submersibles <personal_submersibles at psubs.org> wrote:
>>
>>
>> Hi Hank
>> I have installed one on the intake hose of the scrubber. With a dedicated
>> cannister. It works well for odors but don t think it would be any good for
>> smoke and all its possible harmful contents like carbon monoxide.
>> Regards
>> Antoine
>>
>> On Tuesday, September 19, 2017, hank pronk via Personal_Submersibles <
>> personal_submersibles at psubs.org> wrote:
>>
>> Hi All,
>> A while back we were talking about charcoal filtering the sub
>> environment.  Sean suggested a charcoal filter and it has been on my mind.
>> I think it is a great idea.  I was thinking about putting the charcoal
>> filter on the scrubber intake because my rebreather scrubber is a sealed
>> can.  The other scrubber would need to have the filter on the discharge
>> end.
>> Has anyone done this.
>> This has come to mind after Scott brought up the smoke issue.  Is there a
>> reason I should not put one at the intake of my rebreather scrubber.  It
>> should help with toxic smoke since it is the scrubber  I can breath through
>> manually.
>> Hank
>>
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