[PSUBS-MAILIST] scrubber performance

[Alan via Personal_Submersibles]

Cliff,
12.5hrs in the pool in your submarine! That's one way to get some
peace & quiet. 
I presume you did this in several separate dives.
How long could you stay in before it was getting uncomfortable?
Any worse than a seat on an airplane?
Would you design it any different from an ergonomics perspective?
Alan


> On 31/05/2019, at 8:14 AM, Cliff Redus via Personal_Submersibles <personal_submersibles at psubs.org> wrote:
> 
> Today, I was getting ready to reorder SodaSorb HP for the August 5-9 Flathead Lake Expedition and found from my supplier, Amron International, that W.R. Grace and Co. was bought out by another company and the new company has stopped manufacturing SodaSorb HP.  Amron guys are recommending a replacement product Draeger 6737818 DiveSorb® Pro Carbon Dioxide Absorbents 16.8 kg - 37 lb
>     .  Draeger DiveSorb® Pro Carbon Dioxide Absorbents 16.8 kg - 37 lb 6737818 at a similar price, $107/37 lbs.
> 
> $107.15	
> Draeger DiveSorb® Pro Carbon Dioxide Absorbents 16.8 kg - 37 lb 6737818
> Draeger DiveSorb® Pro Carbon Dioxide Absorbents 16.8 kg - 37 lb 6737818
> 
> Found a US Navy report written in 1987 were they compared different CO2 absorbents in their MK 15 re-breather.  The abstract from the report is given below. http://dspace.rubicon-foundation.org/xmlui/bitstream/handle/123456789/4853/NEDU_1987_11.pdf?sequence=1
> 
> "A comparative study of Draegersorb, LimePak and HP Sodasorb carbon dioxide absorbents within
> the MK 15 Mod 0 Underwater Breathing Apparatus (MK 15) was performed at the Navy Experimental
> Diving U n i t . Draegersorb and LimePak appeared t o be marginally more e f f e c t i v e than HP Sodasorb.
> However, t h e i r usefulness to extend the MK 15 canister duration may be l i m i t e d because of the
> wide v a r i a b i l i t y of time to reach the a r b i t r a r i l y determined canister breakthrough of 3.8 mHg
> CO 0.5% SEV) though the oxygen consumption rates were similar, V02 rates were similar, V02
> 1 mi. The polypropylene moisture absorbent pads are a suitable replacement pad for the
> MK 15 and can be reused."
> 
> For those of you that were using SodaSorb HP, what are switching to?  My inclination is to go with the Draeger Dive Sorb Pro.  Does anyone know of a supplier that still has an inventory of SodaSorbHP 4-8 mesh?
> 
> I wish I would have know this one week ago.  I just completed a 12.5 hour pool dive to determine how long my initial scrubber load of 3.5 lbs of SodaSorb HP would last before breakthrough. 
> 
> Cliff
> 
> 
> 
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