[PSUBS-MAILIST] CO2

Tue Jun 3 16:01:40 EDT 2025

Many thanks Alec,
I will chase it up.
I have built a Hank type pool and crane for pool testing first.
Estimated weight is about 3.8 tons.
Regards, Hugh

-----Original Message-----
From: Personal_Submersibles <personal_submersibles-bounces at psubs.org> On
Behalf Of via Personal_Submersibles
Sent: Tuesday, 3 June 2025 2:45 PM
To: personal_submersibles at psubs.org
Subject: Personal_Submersibles Digest, Vol 138, Issue 4

Send Personal_Submersibles mailing list submissions to
	personal_submersibles at psubs.org

To subscribe or unsubscribe via the World Wide Web, visit
	http://www.whoweb.com/mailman/listinfo.cgi/personal_submersibles
or, via email, send a message with subject or body 'help' to
	personal_submersibles-request at psubs.org

You can reach the person managing the list at
	personal_submersibles-owner at psubs.org

When replying, please edit your Subject line so it is more specific than
"Re: Contents of Personal_Submersibles digest..."

Today's Topics:

   1. Re: CO2 (Alec Smyth via Personal_Submersibles)

----------------------------------------------------------------------

Message: 1
Date: Mon, 2 Jun 2025 22:44:53 -0400
From: Alec Smyth 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:
	<CABECYQ5unF66f5tyvxJnXd+Wb=ycMAn+VY1V3LDGY1s7hxZ=9g at mail.gmail.com>
Content-Type: text/plain; charset="utf-8"

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_Acquisitio
> n_YMktg_315_SearchOrgConquer_EmailSignature&af_sub1=Acquisition&af_sub
> 2=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
>
> Send Personal_Submersibles mailing list submissions to
>     personal_submersibles at psubs.org
>
> To subscribe or unsubscribe via the World Wide Web, visit
>     http://www.whoweb.com/mailman/listinfo.cgi/personal_submersibles
> or, via email, send a message with subject or body 'help' to
>     personal_submersibles-request at psubs.org
>
> You can reach the person managing the list at
>     personal_submersibles-owner at psubs.org
>
> When replying, please edit your Subject line so it is more specific 
> than
> "Re: Contents of Personal_Submersibles digest..."
>
>
> 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.
>
> _______________________________________________
> Personal_Submersibles mailing list
> Personal_Submersibles at psubs.org
> http://www.psubs.org/mailman/listinfo.cgi/personal_submersibles
>
> -------------- next part -------------- An HTML attachment was 
> scrubbed...
> URL:
> <
> http://www.whoweb.com/pipermail/personal_submersibles/attachments/2025
> 0531/
> 471e2c66/attachment-0001.html>
>
> ------------------------------
>
> 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
> >
> -------------- next part -------------- An HTML attachment was 
> scrubbed...
> URL:
> <
> http://www.whoweb.com/pipermail/personal_submersibles/attachments/2025
> 0531/
> 6ab5af93/attachment-0001.html>
>
> ------------------------------
>
> 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
> Personal_Submersibles at psubs.org
> http://www.psubs.org/mailman/listinfo.cgi/personal_submersibles
>
> -------------- next part -------------- An HTML attachment was 
> scrubbed...
> URL:
> <
> http://www.whoweb.com/pipermail/personal_submersibles/attachments/2025
> 0531/
> ebdd8dbb/attachment-0001.html>
>
> ------------------------------
>
> 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
> -------------- next part -------------- An HTML attachment was 
> scrubbed...
> URL:
> <
> http://www.whoweb.com/pipermail/personal_submersibles/attachments/2025
> 0601/
> 970f2b21/attachment-0001.html>
>
> ------------------------------
>
> 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
>
> -------------- next part -------------- An HTML attachment was 
> scrubbed...
> URL:
> <
> http://www.whoweb.com/pipermail/personal_submersibles/attachments/2025
> 0602/
> b4390ef8/attachment.html>
>
> ------------------------------
>
> Subject: Digest Footer
>
> _______________________________________________
> Personal_Submersibles mailing list
> Personal_Submersibles at psubs.org
> http://www.whoweb.com/mailman/listinfo.cgi/personal_submersibles
>
>
> ------------------------------
>
> End of Personal_Submersibles Digest, Vol 138, Issue 1
> *****************************************************
>
> _______________________________________________
> 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
>
-------------- next part --------------
An HTML attachment was scrubbed...
URL:
<http://www.whoweb.com/pipermail/personal_submersibles/attachments/20250602/
e27c9c77/attachment.html>

------------------------------

Subject: Digest Footer

_______________________________________________
Personal_Submersibles mailing list
Personal_Submersibles at psubs.org
http://www.whoweb.com/mailman/listinfo.cgi/personal_submersibles

------------------------------

End of Personal_Submersibles Digest, Vol 138, Issue 4
*****************************************************