Vaccum packing canisters

teomannaskali · 20th February 2006, 00:13

I it ok to vaccum pack canisters for storing them?

I have canisters that can be taken out of the unit. They are see through and compensated for settling. Would it be ok if I vaccum packed them? Will the vaccum suck out some of the moisture in the sodalime?

If i can, all I have to do at the boat is take one caniseter out and replace it with the unused one. Will save time and hassle.

Teoman

Royal Red · 21st February 2006, 01:59

To maintain the integrity of the scrubbers they should be stored only in the approved containers from the manufacturer. Attempting to vacuum pack pre-packed scrubbers may result in scrubbing degradation due to diffusion of carbon dioxide through the vacuum pack material. Vacuum material would have to be a material that is resistant to diffusion by carbon dioxide and moisture. Otherwise the scrubbers may dry out or become less than "full strength" through carbon dioxide absorption.

Best not to screw around with vacuum packing unless this is approved and certified by the manufacturer.

joshhan2000 · 21st February 2006, 03:10

Vacuum packing is a good idea. As a general rule you can use HDPE for packing of the sorb but if you use LDPE will work to. I do not recommend that you try not to suck all the air out because you lower the vapor pressure you lower the boiling point of the water in the sorb. Remember that the sorb is about 15 to 22% water. So if you decide that you want vacuum pack the canister before you dive you should take it out and allow breathing time. This will allow for the sorb to pick up some of the moisture from the outside. You might want to pre breath the sorb and make sure it turn color. As for how long you can leave it pack I am not sure. I am going to go why out on a limb but if you use the right packing method you should be able to leave it pack for a long time until used it The other thing to remember that the reaction for the sorb goes though it make water so even if you dry it out a little you should be able to make it work. In no way is this proper advise and should be taken as just that a guess. If you give me more details on the method you will use to pack the sorb I would be able to tell you more.

www.sv.vt.edu/classes/MSE2094_NoteBook/ 96ClassProj/examples/triplpt.ht

www.dynalabcorp.com/files/ Use%20and%20Care%20of%20Plastics.pdf

E-man · 21st February 2006, 16:44

I think vacuum packing would work fine as long as it didnt sit for ages...It would be the same as when you got it out of the bucket...just make sure it hasnt settled before you use it.

Quote: (Originally Posted by joshhan2000)

...The other thing to remember that the reaction for the sorb goes though it make water so even if you dry it out a little you should be able to make it work......

I think thats horrible advice..sorry..Its not like because it makes water or your breath brings moisture that its going to magically go to the optimal water content...if you dry out your sorb you have NO idea how much water is in it or how much isnt in it... as water is the most important part of calcium sucking up co2 I wouldnt kiss my life away with dry sorb.

teomannaskali · 21st February 2006, 17:59

Quote: (Originally Posted by joshhan2000)

Vacuum packing is a good idea. As a general rule you can use HDPE for packing of the sorb but if you use LDPE will work to. I do not recommend that you try not to suck all the air out because you lower the vapor pressure you lower the boiling point of the water in the sorb. Remember that the sorb is about 15 to 22% water. So if you decide that you want vacuum pack the canister before you dive you should take it out and allow breathing time. This will allow for the sorb to pick up some of the moisture from the outside. You might want to pre breath the sorb and make sure it turn color. As for how long you can leave it pack I am not sure. I am going to go why out on a limb but if you use the right packing method you should be able to leave it pack for a long time until used it The other thing to remember that the reaction for the sorb goes though it make water so even if you dry it out a little you should be able to make it work. In no way is this proper advise and should be taken as just that a guess. If you give me more details on the method you will use to pack the sorb I would be able to tell you more.

www.sv.vt.edu/classes/MSE2094_NoteBook/ 96ClassProj/examples/triplpt.ht

www.dynalabcorp.com/files/ Use%20and%20Care%20of%20Plastics.pdf

I was intending to pack with poly urethane bag and heat weld it shut (done this before... works ok). Planning on sucking the air out with a pump.

Teoman

wizbang · 21st February 2006, 20:58

Why suck the air out?
Just put in the bag, scrunch it down (techincal tem) to minimise volume and then seal it. (or just tie the top in a not)

Solves the moisture issues as well as the turnover of air (extra CO2) issues.

The only thing then is what grows inside the moist bag.?

It being black should keep growth to min but a friend, that saves his in a sealed semi-clear tupperware container, has noticed molds/growths from time to time.

Hope that helps.

20th February 2006, 00:13	#1 (permalink)
teomannaskali Custom Title Allowed! Current Rebreather/s: Home Build Other Rebreather/s: Not Bought Yet Home Build Join Date: Feb 2006 Location: Istanbul TR Posts: 337	Vaccum packing canisters I it ok to vaccum pack canisters for storing them? I have canisters that can be taken out of the unit. They are see through and compensated for settling. Would it be ok if I vaccum packed them? Will the vaccum suck out some of the moisture in the sodalime? If i can, all I have to do at the boat is take one caniseter out and replace it with the unused one. Will save time and hassle. Teoman
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21st February 2006, 01:59	#2 (permalink)
Royal Red New Member Current Rebreather/s: Other CCR Other Rebreather/s: Other CCR Join Date: Feb 2006 Location: Pennsylvania, USA Posts: 8	Re: Vaccum packing canisters To maintain the integrity of the scrubbers they should be stored only in the approved containers from the manufacturer. Attempting to vacuum pack pre-packed scrubbers may result in scrubbing degradation due to diffusion of carbon dioxide through the vacuum pack material. Vacuum material would have to be a material that is resistant to diffusion by carbon dioxide and moisture. Otherwise the scrubbers may dry out or become less than "full strength" through carbon dioxide absorption. Best not to screw around with vacuum packing unless this is approved and certified by the manufacturer.
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21st February 2006, 03:10	#3 (permalink)
joshhan2000 New Member Current Rebreather/s: Not Bought Yet Other Rebreather/s: Not Bought Yet Join Date: Dec 2005 Location: olympia wa usa Posts: 46	Re: Vaccum packing canisters Vacuum packing is a good idea. As a general rule you can use HDPE for packing of the sorb but if you use LDPE will work to. I do not recommend that you try not to suck all the air out because you lower the vapor pressure you lower the boiling point of the water in the sorb. Remember that the sorb is about 15 to 22% water. So if you decide that you want vacuum pack the canister before you dive you should take it out and allow breathing time. This will allow for the sorb to pick up some of the moisture from the outside. You might want to pre breath the sorb and make sure it turn color. As for how long you can leave it pack I am not sure. I am going to go why out on a limb but if you use the right packing method you should be able to leave it pack for a long time until used it The other thing to remember that the reaction for the sorb goes though it make water so even if you dry it out a little you should be able to make it work. In no way is this proper advise and should be taken as just that a guess. If you give me more details on the method you will use to pack the sorb I would be able to tell you more. www.sv.vt.edu/classes/MSE2094_NoteBook/ 96ClassProj/examples/triplpt.ht www.dynalabcorp.com/files/ Use%20and%20Care%20of%20Plastics.pdf
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21st February 2006, 16:44	#4 (permalink)
E-man On the loop! Current Rebreather/s: Inspiration Classic Optima Other Rebreather/s: Titan Join Date: Sep 2005 Location: Eastern Coast ;) Posts: 212	Re: Vaccum packing canisters I think vacuum packing would work fine as long as it didnt sit for ages...It would be the same as when you got it out of the bucket...just make sure it hasnt settled before you use it. Quote: (Originally Posted by joshhan2000) ...The other thing to remember that the reaction for the sorb goes though it make water so even if you dry it out a little you should be able to make it work...... I think thats horrible advice..sorry..Its not like because it makes water or your breath brings moisture that its going to magically go to the optimal water content...if you dry out your sorb you have NO idea how much water is in it or how much isnt in it... as water is the most important part of calcium sucking up co2 I wouldnt kiss my life away with dry sorb.
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21st February 2006, 17:59	#5 (permalink)
teomannaskali Custom Title Allowed! Current Rebreather/s: Home Build Other Rebreather/s: Not Bought Yet Home Build Join Date: Feb 2006 Location: Istanbul TR Posts: 337	Re: Vaccum packing canisters Quote: (Originally Posted by joshhan2000) Vacuum packing is a good idea. As a general rule you can use HDPE for packing of the sorb but if you use LDPE will work to. I do not recommend that you try not to suck all the air out because you lower the vapor pressure you lower the boiling point of the water in the sorb. Remember that the sorb is about 15 to 22% water. So if you decide that you want vacuum pack the canister before you dive you should take it out and allow breathing time. This will allow for the sorb to pick up some of the moisture from the outside. You might want to pre breath the sorb and make sure it turn color. As for how long you can leave it pack I am not sure. I am going to go why out on a limb but if you use the right packing method you should be able to leave it pack for a long time until used it The other thing to remember that the reaction for the sorb goes though it make water so even if you dry it out a little you should be able to make it work. In no way is this proper advise and should be taken as just that a guess. If you give me more details on the method you will use to pack the sorb I would be able to tell you more. www.sv.vt.edu/classes/MSE2094_NoteBook/ 96ClassProj/examples/triplpt.ht www.dynalabcorp.com/files/ Use%20and%20Care%20of%20Plastics.pdf I was intending to pack with poly urethane bag and heat weld it shut (done this before... works ok). Planning on sucking the air out with a pump. Teoman
(Offline)

21st February 2006, 20:58	#6 (permalink)
wizbang WEB MERMEN Current Rebreather/s: Inspiration Classic Dolphin Home Build Other Rebreather/s: Not Bought Yet Inspiration Vision Evolution Prism Topaz Sport Kiss Classic Kiss Dolphin Home Build Join Date: Feb 2005 Location: Perth Australia Posts: 379	Re: Vaccum packing canisters Why suck the air out? Just put in the bag, scrunch it down (techincal tem) to minimise volume and then seal it. (or just tie the top in a not) Solves the moisture issues as well as the turnover of air (extra CO2) issues. The only thing then is what grows inside the moist bag.? It being black should keep growth to min but a friend, that saves his in a sealed semi-clear tupperware container, has noticed molds/growths from time to time. Hope that helps.
(Offline)

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