How is scrubber exhaustion measured?

[super scrubber]

I've seen general things like buy 2.2kgs for an hour... The technical data sheets for sodalime just say 120L/kg for Co2 present. Does the diameter of the hose have to be taken into account too and different rates of air intake? Is there anywhere that concretely says how much is needed for a 1 hour dive with so and so weight? If someone has more information handy about this, I'd love to hear it. Thanks.

 

[davehicks]

See many other threads on this topic. Start by reading your unit's manual and talking to your instructor.

 

[Duke Dive Medicine]

I've seen general things like buy 2.2kgs for an hour... The technical data sheets for sodalime just say 120L/kg for Co2 present. Does the diameter of the hose have to be taken into account too and different rates of air intake? Is there anywhere that concretely says how much is needed for a 1 hour dive with so and so weight? If someone has more information handy about this, I'd love to hear it. Thanks.

The amount of absorbent you use depends on the volume of your canister. The canister needs to be fully packed to reduce the likelihood of gas channeling. Are you attempting to use a home-built? If not, then ditto @davehicks above - this information should have been well-covered during your class and in the manual for a commercially built rebreather. If it wasn't, then I'd recommend re-taking the class, perhaps with a different instructor to give you a new perspective.

Best regards,
DDM

 

[super scrubber]

The amount of absorbent you use depends on the volume of your canister. The canister needs to be fully packed to reduce the likelihood of gas channeling. Are you attempting to use a home-built? If not, then ditto @davehicks above - this information should have been well-covered during your class and in the manual for a commercially built rebreather. If it wasn't, then I'd recommend re-taking the class, perhaps with a different instructor to give you a new perspective.

Best regards,
DDM

I'm building it from scratch for a school project and don't have diving experience but I'll try to snag a manual of a produced one online then, thanks!

 

[azstinger11]

I'm building it from scratch for a school project and don't have diving experience but I'll try to snag a manual of a produced one online then, thanks!

For rebreathers that are CE certified it is part of their testing. I don’t recall the exact numbers but they put the rebreather at a set depth, in water of a certain temperature, then push a known volume of air through the unit.

 

[Marie13]

This article might be of interest to you:

KISS Rebreathers New Syntactic Foam Insulation

Afraid of the cold?Diving a rebreather in cold water where temps are below 45°F/7°C to that of freezing can impose a very significant affect to the overall functionality of the unit’s scrubber.Looking back of rebreather basics, CCR Divers know that carbon dioxide (CO2) is removed through a...

www.kissrebreathers.com

 

[super scrubber]

This article might be of interest to you:

KISS Rebreathers New Syntactic Foam Insulation

Afraid of the cold?Diving a rebreather in cold water where temps are below 45°F/7°C to that of freezing can impose a very significant affect to the overall functionality of the unit’s scrubber.Looking back of rebreather basics, CCR Divers know that carbon dioxide (CO2) is removed through a...

www.kissrebreathers.com

This article is great, thank you so much!

 

[Duke Dive Medicine]

I'm building it from scratch for a school project and don't have diving experience but I'll try to snag a manual of a produced one online then, thanks!

Nice! I'm sure you'll hear this multiple times and at the risk of stating the obvious: it's a big jump from building one for a school project to actually diving one, especially a home-built. You'd need open-water diving certification and some diving experience before taking a CCR class, and a lot of diving and engineering know-how and experience to build one that is safe to dive.

Best regards,
DDM

 

[The Chairman]

this information should have been well-covered during your class

Shoulda-woulda-coulda. Not all instructors cover this adequately. My first one certainly didn't.

Nice! I'm sure you'll hear this multiple times and at the risk of stating the obvious:

@super scrubber: please read @Duke Dive Medicine's entire posts several times. Scuba diving has inherent risks that many people ignore unless they get certified. Rebreathering is another quantum leap in complexity and dying. Too many have died needlessly trying to figure this out without training.

Get the effin training!​

 

[Duke Dive Medicine]

Shoulda-woulda-coulda. Not all instructors cover this adequately. My first one certainly didn't.


Please read his entire posts several times. Scuba diving has inherent risks that many people ignore unless they get certified. Rebreathering is another quantum leap in complexity and dying. Too many have died needlessly trying to figure this out without training.

Get the effin training!​

I did read his posts and tried to say this diplomatically above. Thanks for phrasing it in diver-ese