[PSUBS-MAILIST] frozen absorbent

Wed Feb 14 13:42:36 EST 2018

Hi Hank, I'm not certain how you can tell if it was frozen. The people I dive with get together and order by the skid. It must get shipped in an insulated container. 

I would suspect if it was frozen that you would see a smaller mesh size and more dust. 

In scuba diving it is more of a problem because there really is no way to accurately measure CO2 in the breathing loop. We consider one half of a percent co2 to be scrubber breakthrough. 10 percent CO2 is fatal however due to the ambient pressure involved in scuba diving .005 turns into .1 in a hurry with the increased partial pressures at depth. 

This would not be so much of a problem in your case because a) you are always at one atmosphere of pressure and b) you are able to accurately monitor CO2 concentration in the sub.

Tom 

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On Wed, Feb 14, 2018 at 1:23 PM -0500, "hank pronk via Personal_Submersibles" <personal_submersibles at psubs.org> wrote:

            Hi Tom,Thanks for the input, how can I tell if it was frozen?  I wonder how it is shipped into our climate?Hank

                        On Wednesday, February 14, 2018, 10:12:07 AM MST, TOM WHENT via Personal_Submersibles <personal_submersibles at psubs.org> wrote:

                     In rebreather diving we will not use sorb that has been frozen. The granules must have moisture in them. From what I understand the freezing breaks up the granules which would alter the characteristics of the flow and surface area of the scrubber. For diving purposes this translate into "work of breathing". I'm not sure how that would affect its use in a one atmosphere submersible which would not be as sensitive to CO2 buildup.

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On Wed, Feb 14, 2018 at 11:58 AM -0500, "hank pronk via Personal_Submersibles" <personal_submersibles at psubs.org> wrote:

Hi All,I ordered some Soda Sorb and it arrived yesterday.  My wife picked it up at the post office and it sat in her car all day.  It was quite cold and could have frozen.  I read all the literature that comes with it and of coarse it says "avoid freezing" .  I suspect when it was in transit it was also cold enough to freeze.   Any ideas how vulnerable it is?Hank

Hi All,I ordered some Soda Sorb and it arrived yesterday.  My wife picked it up at the post office and it sat in her car all day.  It was quite cold and could have frozen.  I read all the literature that comes with it and of coarse it says "avoid freezing" .  I suspect when it was in transit it was also cold enough to freeze.   Any ideas how vulnerable it is?Hank_______________________________________________
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 Hi Tom,Thanks for the input, how can I tell if it was frozen?  I wonder how it is shipped into our climate?Hank
    On Wednesday, February 14, 2018, 10:12:07 AM MST, TOM WHENT via Personal_Submersibles <personal_submersibles at psubs.org> wrote:  

  In rebreather diving we will not use sorb that has been frozen. The granules must have moisture in them. From what I understand the freezing breaks up the granules which would alter the characteristics of the flow and surface area of the scrubber. For diving purposes this translate into "work of breathing". I'm not sure how that would affect its use in a one atmosphere submersible which would not be as sensitive to CO2 buildup.

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On Wed, Feb 14, 2018 at 11:58 AM -0500, "hank pronk via Personal_Submersibles" <personal_submersibles at psubs.org> wrote:

Hi All,I ordered some Soda Sorb and it arrived yesterday.  My wife picked it up at the post office and it sat in her car all day.  It was quite cold and could have frozen.  I read all the literature that comes with it and of coarse it says "avoid freezing" .  I suspect when it was in transit it was also cold enough to freeze.   Any ideas how vulnerable it is?Hank

Hi All,I ordered some Soda Sorb and it arrived yesterday.  My wife picked it up at the post office and it sat in her car all day.  It was quite cold and could have frozen.  I read all the literature that comes with it and of coarse it says "avoid freezing" .  I suspect when it was in transit it was also cold enough to freeze.   Any ideas how vulnerable it is?Hank_______________________________________________
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