[PSUBS-MAILIST] CO2

Tue Jun 3 15:22:00 EDT 2025

Hi Alec

Thanks for the data and the place to buy it. Once you open the 5 gallon
bucket for the first time and put the lid back on, does the top layer start
to activate or can you open the lid a month or two later and it hasn't
skimmed over and start to flash?

Rick

On Mon, Jun 2, 2025 at 5:10 PM Alec Smyth via Personal_Submersibles <
personal_submersibles at psubs.org> wrote:

> Hi Hugh,
>
> Congrats! I'm really looking forward to your boat hitting the water.
>
> 1) The Sofnolime will give you 4 person-hours per pound, so 2 people for 3
> days requires 36 pounds.
> 2) There isn't a standard size. Most of us go small because our dives are
> relatively short and we don't like throwing out barely-used absorbent. The
> rest of the absorvent supply is carried in small containers, ideally ones
> that match the size of your scrubbers.
> 3) For about 2-3 years now, I've been using this veterinary soda lime:
> https://jorvet.com/product/jorvet-soda-lime-5-gallon/  It costs far less
> than the "human" absorbent, but the chemistry is just the regular old
> soda-lime that's been used for a century. I read up on this a bit and
> learned that human CO2 absorbents have been adapted in recent years to deal
> with anesthesia that delivered through breathing gases during surgery. It's
> color-indicating and the same mesh size as what I used to use before, so no
> changes were needed for the scrubbers.
>
> Best,
> Alec
>
> On Mon, Jun 2, 2025 at 9:25 PM Alan James via Personal_Submersibles <
> personal_submersibles at psubs.org> wrote:
>
>> That's great news Hugh.
>> All the best with the testing.
>> I bought my sofa lime from Global Dive years ago. Presume they are still
>> selling it.
>> Alan
>>
>> Yahoo Mail: Search, organise, conquer
>> <https://mail.onelink.me/107872968?pid=nativeplacement&c=US_Acquisition_YMktg_315_SearchOrgConquer_EmailSignature&af_sub1=Acquisition&af_sub2=US_YMktg&af_sub3=&af_sub4=100002039&af_sub5=C01_Email_Static_&af_ios_store_cpp=0c38e4b0-a27e-40f9-a211-f4e2de32ab91&af_android_url=https://play.google.com/store/apps/details?id=com.yahoo.mobile.client.android.mail&listing=search_organize_conquer>
>>
>> On Tue, 3 Jun 2025 at 10:57 am, via Personal_Submersibles
>> <personal_submersibles at psubs.org> wrote:
>> I am finally getting near to a pool test after 15 years.  Weeks now not
>> months.
>> I have been plagued with CANBUS issues and now trying to get an HMI
>> interface working for all the sensors, batteries, etc.
>> Just a couple of questions for the practical people.
>>
>> 1. What is the accepted 3 day quantity of sofnolime for 2 people.
>> 2. What size is recommended for the scrubbers?
>> 3. Where is the bet place to buy it.
>>
>> Regards,
>> Hugh
>>
>>
>>
>> -----Original Message-----
>> From: Personal_Submersibles <personal_submersibles-bounces at psubs.org> On
>> Behalf Of via Personal_Submersibles
>> Sent: Tuesday, 3 June 2025 4:56 AM
>> To: personal_submersibles at psubs.org
>> Subject: Personal_Submersibles Digest, Vol 138, Issue 1
>>
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>> Today's Topics:
>>
>>   1. Re: CO2 (Jon Wallace via Personal_Submersibles)
>>   2. Re: CO2 (Rick Patton via Personal_Submersibles)
>>   3. Re: CO2 (Alan James via Personal_Submersibles)
>>   4. buffing (Rick Patton via Personal_Submersibles)
>>   5. Re: buffing (Jon Wallace via Personal_Submersibles)
>>
>>
>> ----------------------------------------------------------------------
>>
>> Message: 1
>> Date: Sat, 31 May 2025 15:11:29 +0000 (UTC)
>> From: Jon Wallace via Personal_Submersibles
>>     <personal_submersibles at psubs.org>
>> To: Personal Submersibles General Discussion
>>     <personal_submersibles at psubs.org>
>> Subject: Re: [PSUBS-MAILIST] CO2
>> Message-ID: <11643796.3454108.1748704289349 at mail.yahoo.com>
>> Content-Type: text/plain; charset="utf-8"
>>
>> Alan will like this, ChatGPT says 0.0523 kg CO2 within 1217 liters (approx
>> volume of K350) converts to 21,891 ppm.? That corresponds closely to the
>> empirical results Steve McQueen got with his K-250.
>> Jon
>>
>>     On Saturday, May 31, 2025 at 12:28:47 AM EDT, Sean T. Stevenson via
>> Personal_Submersibles <personal_submersibles at psubs.org> wrote:
>>
>>
>> Per the ABS RULES FOR BUILDING AND CLASSING UNDERWATER VEHICLES, SYSTEMS
>> AND
>> HYPERBARIC FACILITIES (2024):
>>
>> Section 8
>> Life Support and Environmental Control Systems
>>
>> 8.5
>> Design Principles
>>
>> 8.5.5
>> Standard Person (2013)
>>
>> Carbon Dioxide (CO2) Produced:
>> 0.0523 (0.115) kg (lbs) per hour at 1 atm.
>>
>> Sean
>>
>>
>>
>> -------- Original Message --------
>> On 2025-05-30 20:46, irox via Personal_Submersibles wrote:
>>
>>
>> One consideration. CO2 is heavier than Nitrogen, so it may sink to the
>> floor, if the meter is near the floor the reading may not be
>> representative
>> of the actual cabin CO2 level. Also if the meter is somewhere than CO2 can
>> 'pool' around it reading may be higher.
>>
>> ?
>>
>> Moving around will also help mix up gases which may help give a more
>> accurate CO2 reading.
>>
>> _______________________________________________
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>> ------------------------------
>>
>> Message: 2
>> Date: Sat, 31 May 2025 07:42:49 -1000
>> From: Rick Patton via Personal_Submersibles
>>     <personal_submersibles at psubs.org>
>> To: Personal Submersibles General Discussion
>>     <personal_submersibles at psubs.org>
>> Subject: Re: [PSUBS-MAILIST] CO2
>> Message-ID:
>>     <CAODkcU-b8z_4ycqM0vf=Jo4qAnEeP0OR4fSnCFEVDMLOAmXcXw at mail.gmail.com>
>> Content-Type: text/plain; charset="utf-8"
>>
>> I had the monitor in the middle of the hull so it would give an accurate
>> reading. I know that Co2 is heavy but what confuses me is the fact that it
>> rose so fast when lying down and then started dropping when I sat up?? I
>> have a fan installed in the back for atmosphere circulation while
>> submerged
>> but it is noisier than I would like but really moves the air around but
>> might end up using a computer fan, just concerned that I will get the
>> proper
>> movement of air.
>>
>> Rick
>>
>> On Sat, May 31, 2025 at 5:01?AM Jon Wallace via Personal_Submersibles <
>> personal_submersibles at psubs.org> wrote:
>>
>> > Rick,
>> >
>> > If you haven't already I would install some fans to help circulate the
>> > air.  I have two 4inch computer fans, one fore, one aft, that work
>> > pretty good for this purpose and they draw negligible power.
>> >
>> > Jon
>> >
>> >
>> >
>> > On Friday, May 30, 2025 at 11:47:24 PM EDT, irox via
>> > Personal_Submersibles <personal_submersibles at psubs.org> wrote:
>> >
>> >
>> > One consideration. CO2 is heavier than Nitrogen, so it may sink to the
>> > floor, if the meter is near the floor the reading may not be
>> > representative of the actual cabin CO2 level. Also if the meter is
>> > somewhere than CO2 can 'pool' around it reading may be higher.
>> >
>> >
>> >
>> > Moving around will also help mix up gases which may help give a more
>> > accurate CO2 reading.
>> > _______________________________________________
>> > Personal_Submersibles mailing list
>> > Personal_Submersibles at psubs.org
>> > http://www.psubs.org/mailman/listinfo.cgi/personal_submersibles
>> > _______________________________________________
>> > Personal_Submersibles mailing list
>> > Personal_Submersibles at psubs.org
>> > http://www.psubs.org/mailman/listinfo.cgi/personal_submersibles
>> >
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>> ------------------------------
>>
>> Message: 3
>> Date: Sat, 31 May 2025 21:12:05 +0000 (UTC)
>> From: Alan James via Personal_Submersibles
>>     <personal_submersibles at psubs.org>
>> To: Personal Submersibles General Discussion
>>     <personal_submersibles at psubs.org>
>> Subject: Re: [PSUBS-MAILIST] CO2
>> Message-ID: <1475430295.3543034.1748725926000 at mail.yahoo.com>
>> Content-Type: text/plain; charset="utf-8"
>>
>> Jon,
>> I get mixed results with chat GPT.
>> I have the paid version & was advised by an expert to select the 03
>> variant
>> that is a lot slower & more thorough, but requires you to be more specific
>> in your requests.
>> I asked it to design a scrubber for me but the result was pretty
>> disappointing.
>> It is very good at calculations.
>> Some times it comes up with amazing results, other times you need to
>> correct
>> it several times.
>> Alan
>>
>> Yahoo Mail: Search, organise, conquer
>>
>>   On Sun, 1 Jun 2025 at 1:12 am, Jon Wallace via
>> Personal_Submersibles<personal_submersibles at psubs.org> wrote:
>> _______________________________________________
>> Personal_Submersibles mailing list
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>> ------------------------------
>>
>> Message: 4
>> Date: Sun, 1 Jun 2025 09:33:15 -1000
>> From: Rick Patton via Personal_Submersibles
>>     <personal_submersibles at psubs.org>
>> To: psubs chat room <personal_submersibles at psubs.org>
>> Subject: [PSUBS-MAILIST] buffing
>> Message-ID:
>>     <CAODkcU8rXbDj_0wnVXb1n41VtczeX2o2Zh4oReE48TYAcrjT6w at mail.gmail.com>
>> Content-Type: text/plain; charset="utf-8"
>>
>> Jon, the Novus compound that I ordered for cleaning up a viewport should
>> be
>> here in a couple of days and was wondering if there was a certain type of
>> buffing pad you used and should I be concerned about the RPM I use?
>>
>> Rick
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>>
>> Message: 5
>> Date: Mon, 2 Jun 2025 16:55:16 +0000 (UTC)
>> From: Jon Wallace via Personal_Submersibles
>>     <personal_submersibles at psubs.org>
>> To: psubs chat room <personal_submersibles at psubs.org>
>> Subject: Re: [PSUBS-MAILIST] buffing
>> Message-ID: <321358833.4029036.1748883316841 at mail.yahoo.com>
>> Content-Type: text/plain; charset="utf-8"
>>
>> Rick,?
>> I don't think the pad actually matters all that much but see link for
>> pads I
>> purchased.? Don't mix the compound and pads, use only one compound with
>> each
>> pad.? I used the green pad for the coarse polish and yellow pad for the
>> fine
>> polish.? Speed also doesn't matter in my opinion, I think I used medium
>> speed.? Beware of your surroundings however, a motorized buffer with throw
>> some of the polish around and it's difficult to get off when it dries.?
>> Use
>> a drop cloth or plastic to protect anything in the vicinity that you don't
>> want to get polish on.? As well, the polish will get all over your buffer
>> so
>> will require some cleanup when you are done.
>> Amazon.com
>>
>> |
>> |
>> |  |
>> Amazon.com
>>
>>
>> |
>>
>> |
>>
>> |
>>
>>
>>
>>
>>     On Sunday, June 1, 2025 at 03:35:02 PM EDT, Rick Patton via
>> Personal_Submersibles <personal_submersibles at psubs.org> wrote:
>>
>> Jon, the Novus compound?that I ordered for cleaning up a viewport should
>> be
>> here in a couple of days and was wondering if there was a certain?type of
>> buffing pad you used and should I be concerned about the RPM I use??
>> Rick_______________________________________________
>> Personal_Submersibles mailing list
>> Personal_Submersibles at psubs.org
>> http://www.psubs.org/mailman/listinfo.cgi/personal_submersibles
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