Published Scrubber Research

GLOC

GLOC

real name: Gareth Lock!
I am looking for published data which could answer the following question

"Is there any research which shows the differences between sorb type, radial/axial and environments in terms of WOB, efficiency and scrubber duration?"

I remember seeing a bunch of graphs spread throughout the threads, would be useful to have something in one thread which could then be made a sticky.

Regards
 
There was an old document somewhere that had details on testing of different sorbs a long long time ago. I think Sodasorb, AMsorb (I think) and some stuff from Molecular that I presume was a precursor of 797. I'm away at the moment, but will see if I can find a copy. Could have been written 30 or more years ago, possibly for the US navy.


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Gareth,

We are about to publish our evaluation of spherasorb vs sofnoline 797 (comes out in DHM this month). Given that this matter has been debated on the forums at various times we will be getting permission for immediate release of the paper.

Simon M
 
Simon Mitchell said:
Gareth,

We are about to publish our evaluation of spherasorb vs sofnoline 797 (comes out in DHM this month). Given that this matter has been debated on the forums at various times we will be getting permission for immediate release of the paper.

Simon M
Click to expand...

Im very interested to see this.
 
Simon Mitchell said:
Gareth,

We are about to publish our evaluation of spherasorb vs sofnoline 797 (comes out in DHM this month). Given that this matter has been debated on the forums at various times we will be getting permission for immediate release of the paper.

Simon M
Click to expand...

Will it cover the 812 stuff as well as the spherasorb?

Dave


Sent from my iPhone using Tapatalk
 
Hi Matt,
yes, I saw that, good information, particularly highlighting the impact of depth.

Also, there's the rEvo testing that seem to back up the 797 performing much better in the cold, but there being less difference in warmer waters.

The MP test seems to have stuck to the CE 4 degrees.

At the time it was released, I was diving in 30 degree water most of the time using and (disclaimer) helping to sell intersorb, and the cold water performance was less relevant to me, we had no problem in warm water.

Back in the UK now, I am more interested in the difference.

Maybe they'll have both grades and CD as well.

Perhaps throw in Sodasorb for a giggle....

There really isn't enough data out in the open about this, so looking forward to it!


Sent from my iPhone using Tapatalk
 
It would be really good (for me at least) if we had calibrated data for several types of sorb (especially for the inspo tempstick). It is often the case that CD grade is available, for example.

Totally agree about warm water. I have not done many trials in cold-water, but I have in warm-water and the difference is remarkable.

Matt.

Dave1w said:
Hi Matt,
yes, I saw that, good information, particularly highlighting the impact of depth.

Also, there's the rEvo testing that seem to back up the 797 performing much better in the cold, but there being less difference in warmer waters.

The MP test seems to have stuck to the CE 4 degrees.

At the time it was released, I was diving in 30 degree water most of the time using and (disclaimer) helping to sell intersorb, and the cold water performance was less relevant to me, we had no problem in warm water.

Back in the UK now, I am more interested in the difference.

Maybe they'll have both grades and CD as well.

Perhaps throw in Sodasorb for a giggle....

There really isn't enough data out in the open about this, so looking forward to it!


Sent from my iPhone using Tapatalk
Click to expand...
 
Dave1w said:
Hi Matt,
yes, I saw that, good information, particularly highlighting the impact of depth.

Also, there's the rEvo testing that seem to back up the 797 performing much better in the cold, but there being less difference in warmer waters.

The MP test seems to have stuck to the CE 4 degrees.

At the time it was released, I was diving in 30 degree water most of the time using and (disclaimer) helping to sell intersorb, and the cold water performance was less relevant to me, we had no problem in warm water.

Back in the UK now, I am more interested in the difference.

Maybe they'll have both grades and CD as well.

Perhaps throw in Sodasorb for a giggle....

There really isn't enough data out in the open about this, so looking forward to it!


Sent from my iPhone using Tapatalk
Click to expand...



I dived Spherasorb in my KISS all the time i owned it and it was fine in UK conditions for single dive 3-4hour runs with something like 45mins at 70m

I think I did an hour at 65 as probably the longest single dive on SS on the Audascious at around 15c ? (Mallin Head in July/Aug?)

Cave diveing in Mexico I did multiple dives to max six hours run time shalow (max 14m mainly arround 10m) three X 2 hour ish dives one day 20-22c water

Now I am on 797 again becuase I dont have WOB issues on my JJ but will probably go back to SS when i get my KISS wet
 
Simon Mitchell said:
Gareth,

We are about to publish our evaluation of spherasorb vs sofnoline 797 (comes out in DHM this month). Given that this matter has been debated on the forums at various times we will be getting permission for immediate release of the paper.

Simon M
Click to expand...

The DHM issue is out (see contents) but unfortunately the journal is only available to registered users. The rest of us will have to wait until Simon has permission to release the paper directly.
 
Hello,

Our spherasorb vs sofnolime paper published in Diving and Hyperbaric Medicine can now be accessed via the following link:

http://www.dhmjournal.com/index.php/cover-issues/immediate-release-articles

This matter has been debated a number of times over the years. As you will see there are grounds for being cautious about the relative performance of sorb preparations.

This is the second in our series of studies on CO2 matters in rebreathers (the first was the study to determine whether a 5 minute prebreathe can reliably detect incomplete scrubbing of CO2 from a rebreather circuit).

Data collection is complete or nearly so in studies addressing: how to store a partially used CO2 scrubber ("unprotected on the shelf" vs sealed in an airtight bag); extendair cartridges vs granular sorb; and how accurately temp sticks predict CO2 breakthrough. At least some of these data will be presented at Eurotek and published in due course.

Simon M
 
So basicly 30% reduction in scrubber duration with Spherasorb with a 10% improvement in WOB

Which all sounds about what id have expected but I thought the WOB benifit of the Sphersorb would be better. Cirtainly when i used it in my KISS i noticed an improvement in WOB but I also expected one so there could be an argument for the Placebo effect.


As I have aid before I have run Sperasorb for 6 hours in a KISS on warm water shalow dives but its aparent I was much closer to the edge than I beleived at the time.

It wont stop me running 3-4 hour single deep dives in the UK as I still feel confident that is within its working peramiters with a big enough margin of error based on calculated C02 production relevent to RMV of an average 0.7 lpm

ATB

Mark
 
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