[PSUBS-MAILIST] Scrubber size

[Sean T. Stevenson via Personal_Submersibles]

The only information I am aware of is what's on the technical data sheet from Molecular Products.

See attached.

Sean

Sent

-------- Original Message --------
On Dec. 14, 2020, 17:20, Brian Cox via Personal_Submersibles wrote:

> I'm using 408 mesh CD grade Sofnolime ,
>
> Sean, Is there any documentation on the difference in the life of the absorbent material from the smaller 797 grade as opposed to the CD grade? Assuming efficient air flow.
>
> Brian
>
> --- personal_submersibles at psubs.org wrote:
>
> From: "Sean T. Stevenson via Personal_Submersibles" <personal_submersibles at psubs.org>
> To: personal_submersibles at psubs.org
> Subject: Re: [PSUBS-MAILIST] Scrubber size
> Date: Mon, 14 Dec 2020 23:32:51 +0000
>
> Scrubber capacity will be dictated not only by the mass of scrubber media available, but by the particle size as well, because the reaction is surface area driven. With Sofnolime, 797 grade is much smaller granules than CD grade and so will give you extended duration at the expense of much greater resistance to airflow. This will e.g. improve your dwell time but slow down the complete cabin turnover rate.
>
> Sean
>
> -------- Original Message --------
> On Dec. 14, 2020, 16:24, Brian Cox via Personal_Submersibles < personal_submersibles at psubs.org> wrote:
>
>> My scrubber holds about 11 lbs of sofnolime. I have been wrapping my scrubber with cling wrap after the end of a dive. I've mostly been testing on my "dives" so usually only an hour or so.
>>
>> Also, I just recently charged up my scrubber and then wrapped with cling wrap, so the scrubber is ready to go for the next dive.
>>
>> Brian
>>
>> --- personal_submersibles at psubs.org wrote:
>>
>> From: "Sean T. Stevenson via Personal_Submersibles" <personal_submersibles at psubs.org>
>> To: personal_submersibles at psubs.org
>> Subject: Re: [PSUBS-MAILIST] Scrubber size
>> Date: Mon, 14 Dec 2020 18:49:52 +0000
>>
>> The recommendation to use a centrifugal blower as opposed to an axial fan necessarily implies this, but I just wanted to point out that a radial scrubber will be most efficient with the flow direction from outside to inside of the scrubber.
>>
>> Sean
>>
>> -------- Original Message --------
>> On Dec. 13, 2020, 20:12, 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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>
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