[PSUBS-MAILIST] charcoal filter

[Alan via Personal_Submersibles]

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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