[PSUBS-MAILIST] O2 regulator

Thu Jul 17 19:12:53 EDT 2014

Good points Alan.  I concur that grade as well as being fit for service are important.  All of my experience has been with one absorbent, SodaSorb HP.  This is the same absorbent that Phil has used for years.

As to taking my boat to this years PSUB convention, the answer is no unfortunately.  Nor will I be able to attend.  I though I was going to be able to make it and sent my registration fee into Jon but and had to back out because of a consulting job that has come up.

Take lots of pictures in Phil's toy shop!

Cliff

Cliff Redus
Redus Engineering
USA mobile:  830-931-1280
cliffordredus at sbcglobal.com 

________________________________
 From: Alan James via Personal_Submersibles <personal_submersibles at psubs.org>
To: Personal Submersibles General Discussion <personal_submersibles at psubs.org> 
Sent: Thursday, July 17, 2014 5:44 PM
Subject: Re: [PSUBS-MAILIST] O2 regulator

Cliff,
another factor in the equation is the grade of C02 absorbent.
Here is an article by Molecular products warning rebreather divers not to use medical grade absorbant.
http://www.molecularproducts.com/pdf/Use%20of%20medical%20grade%20Sofnolime%20in%20Diving%20Applications%20Jan%202010.pdf

Molecular products who manufacture sofnolime, have a computer program for calculating the amount of flow you need to maintain
C02 within certain levels, based on the internal volume of your hull. 
I contacted them ages ago with questions about their product & they seemed to enjoy using their computer & doing the calculations.
http://www.molecularproducts.com/us/

My link recently to EMT medical didn't work ( hate copying links on my Ipad) so here it is again.
http://www.emtmedicalco.com/REGULATORS-FLOWMETERS-FITTINGS_c63.htm

  Are you taking the R300 up to Bellingham Cliff?
Alan 

________________________________
 From: Cliff Redus via Personal_Submersibles <personal_submersibles at psubs.org>
To: Personal Submersibles General Discussion <personal_submersibles at psubs.org> 
Sent: Friday, July 18, 2014 8:58 AM
Subject: Re: [PSUBS-MAILIST] O2 regulator

Slow but not to slow. You need to be able to pull the cabin volume through  the scrubber in a reasonable amount of time.  I would look for another squirrel cage blower but a smaller new one that is quite. The issue with a large  blower is that it can pull to much current.  ABS requires that the life support system has to function for 72 hours on the emergency battery bank only.  If the current is to high, you end up with good scrubbing but don't have the battery capacity to last the 72 hours.  If the blower is to small, you solve the current problem but you can't meet the 5000 ppm concentration constraint.

Cliff 

On Thursday, July 17, 2014 3:44 PM, hank pronk via Personal_Submersibles <personal_submersibles at psubs.org> wrote:

Cliff,
thanks' got it.  Just for interest, Gamma's original scrubber has a hug squirrel cage fan, like from a car heater.  The only problem is it is very noisy.  I was under the impression the air had to move slowly through the absorbent.
Hank 

On Thursday, July 17, 2014 4:04:55 PM, Cliff Redus via Personal_Submersibles <personal_submersibles at psubs.org> wrote:

If you think of the filter as a cylinder, for an axial flow filter, the flow of the air through the filter is along the axis of the cylinder.  Flow comes in one end and out the other.  For radial flow filter, the flow radiates out perpendicular to the axis of the cylinder and there is a hollow inner space.  The inlet or exit is connected to this inner space.  

See picture
http://www.kleenwater.com/page.html?id=31

Weak fans are a problem for scrubbers from my experience.  One other point, I found that box style blower was better than axial fan as then push less flow but can generate higher head which is needed to push the air through the absorbent.

Cliff 

On Thursday, July 17, 2014 2:40 PM, Alan via Personal_Submersibles <personal_submersibles at psubs.org> wrote:

Hi Hank,
I've pasted this one before.
emtmedicalco.com/REGULATORS-http://m.youtube.com/watch?v=kLtTOmvTqrk-FITTINGS_c63.htm
They are in the North West. They have a great selection of oxygen equipment, tanks &
fittings on their site.
Alan

Sent from my iPad

On 17/07/2014, at 7:55 am, hank pronk via Personal_Submersibles <personal_submersibles at psubs.org> wrote:

Hi All,
>I need to find a pediatric flow meter and regulator for Gamma.  Or is there something better?
>Hank
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