[PSUBS-MAILIST] O2 regulator

[Cliff Redus via Personal_Submersibles]

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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