Storing sofnolime in scrubber housing!!!

Stewart McMickan · 27th April 2007, 15:09

Any Recommendations on storing sofnolime after only 1hrs use for periods of up to three weeks? should it be replaced or does it have much effect of the duration of the scrubber? at present i make sure that it is dry and store it in an air tight container.

***schford*** · 27th April 2007, 15:22

My view is that if it is not absorbing CO2 then it should be ok.

**Gill Envy** · 27th April 2007, 15:47

we have been doing this for a year now and haven't died once yet

the amount of Co2 in room air is very low compared to breath and it's not being actively circulated through the scrubber...and that's if you just left it sitting out (not a good idea)...I bag our scrubber housing/with sorb after drying overnight.

Bill Pringle · 27th April 2007, 17:09

I have a couple of rubber stoppers for my Dolphin canister which seem to work just fine, Also had a friend whom used a tupperware cake container for his radial Mk 15 canister.

Dave Faye · 27th April 2007, 18:45

Quote: (Originally Posted by Gill Envy)

I bag our scrubber housing/with sorb after drying overnight.

Gil are you saying you keep the scrubber in the canister insert let it dry overnight and them place the canister insert in an airtight bag?
Is this how most store it after shorter duration dives? Anyone want to give me some input.

I just say f-it and repack most of the time.

Outlaw · 27th April 2007, 18:52

Quote: (Originally Posted by Gill Envy)

we have been doing this and haven't died once yet

the amount of Co2 in room air is very low compared to breath and it's not being actively circulated through the scrubber...and that's if you just left it sitting out (not a good idea)...I bag our scrubber housing/with sorb after drying overnight.

so is this is way we should be storing it ? let it dry and then put it in a bag? i was doing that as soon as i came after the dive,and so far so good, but does that affect the scrubber in any way?

you made me curious now.

Gene_Hobbs · 27th April 2007, 18:55

Quote: (Originally Posted by Stewart McMickan)

Any Recommendations on storing sofnolime after only 1hrs use for periods of up to three weeks? should it be replaced or does it have much effect of the duration of the scrubber? at present i make sure that it is dry and store it in an air tight container.

All I can think of is seven days...

Effects on Scrubber Endurance of Storing Soda Lime in CF Rebreathers.
Eaton. 1995
RRR ID: 3871

Abstract:
Canadian Forces divers using rebreather diving apparatus are currently restricted to pre-dive preparation times of only 6 hours. A proposal was made to increase this time to 7 days. Theoretically, this was possible; however, no empirical data were available to indicate that the chemical carbon dioxide absorbent could survive an extended storage period in Canadian Forces rebreathers. Consequently, the Experimental Diving Unit of the Defence and Civil Institute of Environmental Medicine conducted a study to determine if storage of soda lime would reduce the carbon dioxide scrubber endurance. The tests measured scrubber endurance using proposed NATO standard procedures under three conditions: (a) no storage; (b) seven days of storage; and (c) 1 hour under the endurance test conditions, followed by 7 days storage and then completion of the endurance test. The results indicated no difference between the three conditions; thereby, supporting the proposal for up to 7 days of storage. On the other hand, issues related to cold weather operations biological hazards, heavy exertion and accelerated material wear imposed some restrictions on rebreather storage.

robinfante · 27th April 2007, 19:41

my postdive procedure is to unhook the hose from the inhale side and draw fresh air through the unit, thereby dropping the PO2 to .21 and pulling some of the moisture out. I usually seal it right up again, mostly because I don't want to forget to (especially with the radial), and don't want it getting splashed. When at home I pull the scrubber can out and stick it in a dry bag (like for kayaking), labelling it with the date and amount of time on it. I used to dump if I hadn't dived it in in a week, then two weeks, but lately I've been going longer and longer with no ill effects. It seems like most folks tolerance is somewhere between "a week" and "whenever I go diving next", I started out with the former and am edging towards the latter. More of a factor than time for me is what the conditions were that I was diving in. I dumped a sport kiss scrubber once after two weeks that only had an hour on it, and it looked like pure shite - big ole clumps. Scared myself with that one, I'm much more inclined to dump now if there are any suspicions.

I would be interested if anyone has taken a co2 hit from a semi-used scrubber? I've gotten two, both from when I first started diving ccr, both on fresh scrubbers - in one case I wasn't really moving the gas around enough in my prism, in the other I was working hard on a sport kiss and overbreathed it.

diverrob · 27th April 2007, 20:28

Check this link out. I have been using this for a year now and love it. The head can dry and the scrubber is protected between dives http://www.rebreatherworld.com/gener...scrubber+saver

Rob

Outlaw · 27th April 2007, 21:00

Quote: (Originally Posted by diverrob)

Check this link out. I have been using this for a year now and love it. The head can dry and the scrubber is protected between dives http://www.rebreatherworld.com/gener...scrubber+saver

Rob

sure it looks very nice and tidy piece... nice one.

Quote: (Originally Posted by robinfante)

my postdive procedure is to unhook the hose from the inhale side and draw fresh air through the unit, thereby dropping the PO2 to .21 and pulling some of the moisture out. I usually seal it right up again, mostly because I don't want to forget to (especially with the radial), and don't want it getting splashed. When at home I pull the scrubber can out and stick it in a dry bag (like for kayaking), labelling it with the date and amount of time on it. I used to dump if I hadn't dived it in in a week, then two weeks, but lately I've been going longer and longer with no ill effects. It seems like most folks tolerance is somewhere between "a week" and "whenever I go diving next", I started out with the former and am edging towards the latter. More of a factor than time for me is what the conditions were that I was diving in. I dumped a sport kiss scrubber once after two weeks that only had an hour on it, and it looked like pure shite - big ole clumps. Scared myself with that one, I'm much more inclined to dump now if there are any suspicions.

I would be interested if anyone has taken a co2 hit from a semi-used scrubber? I've gotten two, both from when I first started diving ccr, both on fresh scrubbers - in one case I wasn't really moving the gas around enough in my prism, in the other I was working hard on a sport kiss and overbreathed it.

yeah, i am curious about the half used scrubbers too. what do you think of the scrubber that goes blueish when used. that way, you shall know how much you got left on the package right?

27th April 2007, 15:09	#1 (permalink)
Stewart McMickan New Member Current Rebreather/s: Inspiration Vision Other Rebreather/s: Join Date: Mar 2006 Location: ATHLONE Ireland Posts: 39	Storing sofnolime in scrubber housing!!! Any Recommendations on storing sofnolime after only 1hrs use for periods of up to three weeks? should it be replaced or does it have much effect of the duration of the scrubber? at present i make sure that it is dry and store it in an air tight container.
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27th April 2007, 15:22	#2 (permalink)
*schford* Despotic Overlord Current Rebreather/s: Megalodon Sport Kiss Other Rebreather/s: Join Date: Jan 2005 Location: London, UK Posts: 3,662	Re: Storing sofnolime in scrubber housing!!! My view is that if it is not absorbing CO2 then it should be ok. __________________ Bailout and Kit Management account for Murphy's Law The only bad question is one you did not ask and later wish you had. Use of Rebreather World is subject to the Rebreather World Terms & Conditions of Use
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27th April 2007, 15:47	#3 (permalink)
Gill Envy Shearwater Copis Diver Current Rebreather/s: Other CCR Other Rebreather/s: Evolution Other CCR Join Date: Nov 2005 Location: seattle Posts: 1,254	Re: Storing sofnolime in scrubber housing!!! we have been doing this for a year now and haven't died once yet the amount of Co2 in room air is very low compared to breath and it's not being actively circulated through the scrubber...and that's if you just left it sitting out (not a good idea)...I bag our scrubber housing/with sorb after drying overnight. __________________ Gill Envy ...Because I wasn't born with gills! ><(°>><(°>><(°>><(°>><(°>><(°>><(°>><(°> Last edited by Gill Envy : 27th April 2007 at 23:42.
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27th April 2007, 17:09	#4 (permalink)
Bill Pringle New Member Current Rebreather/s: Other CCR Dolphin Other Rebreather/s: Other CCR Dolphin Join Date: Apr 2005 Location: Ventura Ca Posts: 15	Re: Storing sofnolime in scrubber housing!!! I have a couple of rubber stoppers for my Dolphin canister which seem to work just fine, Also had a friend whom used a tupperware cake container for his radial Mk 15 canister.
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27th April 2007, 18:45	#5 (permalink)
Dave Faye This is my custom title Current Rebreather/s: Evolution Other Rebreather/s: Inspiration Classic Evolution Megalodon Join Date: Oct 2005 Location: Boston Posts: 151	Re: Storing sofnolime in scrubber housing!!! Quote: (Originally Posted by Gill Envy) I bag our scrubber housing/with sorb after drying overnight. Gil are you saying you keep the scrubber in the canister insert let it dry overnight and them place the canister insert in an airtight bag? Is this how most store it after shorter duration dives? Anyone want to give me some input. I just say f-it and repack most of the time. __________________ DSF
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27th April 2007, 18:52	#6 (permalink)
Outlaw In search of Law breaking Current Rebreather/s: Megalodon Other Rebreather/s: Join Date: Aug 2006 Location: Cyprus, Nicosia Posts: 627	Re: Storing sofnolime in scrubber housing!!! Quote: (Originally Posted by Gill Envy) we have been doing this and haven't died once yet the amount of Co2 in room air is very low compared to breath and it's not being actively circulated through the scrubber...and that's if you just left it sitting out (not a good idea)...I bag our scrubber housing/with sorb after drying overnight. so is this is way we should be storing it ? let it dry and then put it in a bag? i was doing that as soon as i came after the dive,and so far so good, but does that affect the scrubber in any way? you made me curious now. __________________ CMAS - IANTD - TDI Kamikazi Instrustor Trainer DIRRebreather Team Member ---------------------------- "Once an Outlaw, always an Outlaw"
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27th April 2007, 18:55	#7 (permalink)
Gene_Hobbs Custom Title Allowed! Current Rebreather/s: Not Bought Yet Other Rebreather/s: Not Bought Yet Join Date: Sep 2006 Location: Durham, NC, USA Posts: 113	DRDC Paper Quote: (Originally Posted by Stewart McMickan) Any Recommendations on storing sofnolime after only 1hrs use for periods of up to three weeks? should it be replaced or does it have much effect of the duration of the scrubber? at present i make sure that it is dry and store it in an air tight container. All I can think of is seven days... Effects on Scrubber Endurance of Storing Soda Lime in CF Rebreathers. Eaton. 1995 RRR ID: 3871 Abstract: Canadian Forces divers using rebreather diving apparatus are currently restricted to pre-dive preparation times of only 6 hours. A proposal was made to increase this time to 7 days. Theoretically, this was possible; however, no empirical data were available to indicate that the chemical carbon dioxide absorbent could survive an extended storage period in Canadian Forces rebreathers. Consequently, the Experimental Diving Unit of the Defence and Civil Institute of Environmental Medicine conducted a study to determine if storage of soda lime would reduce the carbon dioxide scrubber endurance. The tests measured scrubber endurance using proposed NATO standard procedures under three conditions: (a) no storage; (b) seven days of storage; and (c) 1 hour under the endurance test conditions, followed by 7 days storage and then completion of the endurance test. The results indicated no difference between the three conditions; thereby, supporting the proposal for up to 7 days of storage. On the other hand, issues related to cold weather operations biological hazards, heavy exertion and accelerated material wear imposed some restrictions on rebreather storage. __________________ http://rubicon-foundation.org/ Home of the Rubicon Research Repository. For help getting started with the Repository, please visit our FAQ page. PLEASE support our work. "Oxygen is addictive and deadly. Everyone who uses it will eventually die" --RW Hamilton, PhD 1991
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27th April 2007, 19:41	#8 (permalink)
robinfante I have a smoking gun Current Rebreather/s: Megalodon Prism Topaz MK 15.X Other Rebreather/s: Sport Kiss Join Date: Nov 2005 Location: mountain lakes nj Posts: 133	Re: Storing sofnolime in scrubber housing!!! my postdive procedure is to unhook the hose from the inhale side and draw fresh air through the unit, thereby dropping the PO2 to .21 and pulling some of the moisture out. I usually seal it right up again, mostly because I don't want to forget to (especially with the radial), and don't want it getting splashed. When at home I pull the scrubber can out and stick it in a dry bag (like for kayaking), labelling it with the date and amount of time on it. I used to dump if I hadn't dived it in in a week, then two weeks, but lately I've been going longer and longer with no ill effects. It seems like most folks tolerance is somewhere between "a week" and "whenever I go diving next", I started out with the former and am edging towards the latter. More of a factor than time for me is what the conditions were that I was diving in. I dumped a sport kiss scrubber once after two weeks that only had an hour on it, and it looked like pure shite - big ole clumps. Scared myself with that one, I'm much more inclined to dump now if there are any suspicions. I would be interested if anyone has taken a co2 hit from a semi-used scrubber? I've gotten two, both from when I first started diving ccr, both on fresh scrubbers - in one case I wasn't really moving the gas around enough in my prism, in the other I was working hard on a sport kiss and overbreathed it. __________________ Homer to Bart: “When a woman says nothing’s wrong, everything is wrong. And when a woman says everything’s wrong, EVERYTHING is wrong. And when a woman says something’s not funny, you better not laugh your ass off!” Check out www.robinfante.blogspot.com for trip reports and pics.
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27th April 2007, 20:28	#9 (permalink)
diverrob The Evolution of Diving Current Rebreather/s: Evolution Other SCR Other Rebreather/s: Not Bought Yet Other SCR Join Date: May 2005 Location: Victoria BC Canada Posts: 320	Re: Storing sofnolime in scrubber housing!!! Check this link out. I have been using this for a year now and love it. The head can dry and the scrubber is protected between dives http://www.rebreatherworld.com/gener...scrubber+saver Rob
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27th April 2007, 21:00	#10 (permalink)
Outlaw In search of Law breaking Current Rebreather/s: Megalodon Other Rebreather/s: Join Date: Aug 2006 Location: Cyprus, Nicosia Posts: 627	Re: Storing sofnolime in scrubber housing!!! Quote: (Originally Posted by diverrob) Check this link out. I have been using this for a year now and love it. The head can dry and the scrubber is protected between dives http://www.rebreatherworld.com/gener...scrubber+saver Rob sure it looks very nice and tidy piece... nice one. Quote: (Originally Posted by robinfante) my postdive procedure is to unhook the hose from the inhale side and draw fresh air through the unit, thereby dropping the PO2 to .21 and pulling some of the moisture out. I usually seal it right up again, mostly because I don't want to forget to (especially with the radial), and don't want it getting splashed. When at home I pull the scrubber can out and stick it in a dry bag (like for kayaking), labelling it with the date and amount of time on it. I used to dump if I hadn't dived it in in a week, then two weeks, but lately I've been going longer and longer with no ill effects. It seems like most folks tolerance is somewhere between "a week" and "whenever I go diving next", I started out with the former and am edging towards the latter. More of a factor than time for me is what the conditions were that I was diving in. I dumped a sport kiss scrubber once after two weeks that only had an hour on it, and it looked like pure shite - big ole clumps. Scared myself with that one, I'm much more inclined to dump now if there are any suspicions. I would be interested if anyone has taken a co2 hit from a semi-used scrubber? I've gotten two, both from when I first started diving ccr, both on fresh scrubbers - in one case I wasn't really moving the gas around enough in my prism, in the other I was working hard on a sport kiss and overbreathed it. yeah, i am curious about the half used scrubbers too. what do you think of the scrubber that goes blueish when used. that way, you shall know how much you got left on the package right? __________________ CMAS - IANTD - TDI Kamikazi Instrustor Trainer DIRRebreather Team Member ---------------------------- "Once an Outlaw, always an Outlaw"
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