Rebreather NSS/CDS report from death at Peacock earlier this year.

[lostsheep]

Ok but when u donate you no longer have a backup for you?

That too would be unit and configuration dependent ; I absolutely have a bungeed necklace and long hose.

ETA: please don’t use letters for words.

 

[KevinNM]

Too much CO2 in loop is easily detectable by high breath rate and sense of lack of air, and best way to deal with it is to bail out - that's IMHO essential basic knowledge.

Not always. I know people who had no such symptoms after a CO2 breakthrough and felt they were completely fine, while bouncing off the cave ceiling and floor. Their teammates convinced them to bail out.

 

[Kay Dee]

Bovs are fine so long as it hasn't been contaminated with costic slime.

Agreed, for sure! However, I was speaking specifically in relation to a Co2 'event', not a flood / caustic cocktail. So my 'BOV reigns supreme' relates to that situation. The allusion to 'flood' in my post was to do with what may happen in the event of an 'improper' bailout (or, in rocket launch terms, a 'major bailout anomaly' ), i.e. after the fact of bailing out.

 

[gordonscuba]

The Meg, SugGravity Defender, and XCCR all allow for different size (vertical length) scrubbers and corresponding spacers. I went to just using the standard 8# scrubber and appropriate spacer to avoid this potential operator error issue.

Please elaborate on how it’s possible to “design out” this kind of failure (operator error)

The scrubber on the SF2 allows the user to fill to the desired amount of sorb, at which point the upper mesh is screwed down on top of it. A spring keeps a certain amount of force on the upper mesh at all times. This mechanism packs the sorb and keeps it in place with a mesh/spring combination. Regardless of how much or how little sorb the diver decides to use, the scrubber bucket is the same, and its position in the main tube is the same. There is no "spacer" to forget. Of course, this is not to imply there couldn't be new/different user errors in this setup, but this at least eliminates the particular error in which the user forgets a spacer. Yet, it keeps the potentially desirable feature of allowing different amounts of sorb for different dives, and mostly eliminates the common practice of using an already partially-used scrubber on the next day (which I constantly hear people talking about e.g. "want to finish out this scrubber before the week's over" etc). In the morning you pack the amount which is appropriate for the dives you plan to do that day, obviously with appropriate safety margin.

 

[DOBY]

The scrubber on the SF2 allows the user to fill to the desired amount of sorb, at which point the upper mesh is screwed down on top of it. A spring keeps a certain amount of force on the upper mesh at all times. This mechanism packs the sorb and keeps it in place with a mesh/spring combination. Regardless of how much or how little sorb the diver decides to use, the scrubber bucket is the same, and its position in the main tube is the same. There is no "spacer" to forget. Of course, this is not to imply there couldn't be new/different user errors in this setup, but this at least eliminates the particular error in which the user forgets a spacer. Yet, it keeps the potentially desirable feature of allowing different amounts of sorb for different dives, and mostly eliminates the common practice of using an already partially-used scrubber on the next day (which I constantly hear people talking about e.g. "want to finish out this scrubber before the week's over" etc). In the morning you pack the amount which is appropriate for the dives you plan to do that day, obviously with appropriate safety margin.

The SF2 has an axial scrubber that allows the above option.

Hammerhead/Defenders, Megs, and XCCRs all have radial scrubbers where the above option will not work.

 

[kensuf]

The scrubber on the SF2 allows the user to fill to the desired amount of sorb, at which point the upper mesh is screwed down on top of it. A spring keeps a certain amount of force on the upper mesh at all times. This mechanism packs the sorb and keeps it in place with a mesh/spring combination. Regardless of how much or how little sorb the diver decides to use, the scrubber bucket is the same, and its position in the main tube is the same. There is no "spacer" to forget. Of course, this is not to imply there couldn't be new/different user errors in this setup, but this at least eliminates the particular error in which the user forgets a spacer. Yet, it keeps the potentially desirable feature of allowing different amounts of sorb for different dives, and mostly eliminates the common practice of using an already partially-used scrubber on the next day (which I constantly hear people talking about e.g. "want to finish out this scrubber before the week's over" etc). In the morning you pack the amount which is appropriate for the dives you plan to do that day, obviously with appropriate safety margin.

Doby beat me to it.

 

[Kay Dee]

Hammerhead/Defenders, Megs, and XCCRs all have radial scrubbers where the above option will not work.

Hey, you forgot the venerable 15.5.

 

[sunnyboy]

The SF2 has an axial scrubber that allows the above option.

Hammerhead/Defenders, Megs, and XCCRs all have radial scrubbers where the above option will not work.

and the Prism Topaz.