Following on from the standard bailout mixes thread

AM · 7th September 2007, 08:51

There's a simple solution to mitigate rebreathing inert gas on shallow decompression and that's flush the loop with O2 periodically, I am amazed at how few divers I see actually flushing the loop. For sure on an eCCR you can hear the pattern of the solenoid change when you're offgassing shedloads of inerts to the loop on long decos. This also gives the advantage that you're breathing O2 level above setpoint and there's no bouyancy issues with constant solenoid firing.

As for O2 as a constrictor, this only occurs at certain thermal levels and there are many well documented bends from cooling too much as the blood cannot transport gas, so proper thermal considerations on deep dives is essential.

Air breaks - this is just another fallacy created by NOAA plucking numbers out of the air years ago. I won't advocate that other people don't take air breaks, but I never have. But everyone's oxygen tolerance is variable and from day to day it varies, however I have never been a believer in introducing inert gas on decompression, particularly not near ceilings.

Regards

AnneMarie

Depth-junkie · 7th September 2007, 09:50

Quote:

For sure on an eCCR you can hear the pattern of the solenoid change when you're offgassing shedloads of inerts to the loop on long decos

Believe it or not i can tell when i am starting to clean up by the soleniod pattern on the 6m hang.

ATB
Gareth

Mdemon · 7th September 2007, 10:18

Quote: (Originally Posted by am)

There's a simple solution to mitigate rebreathing inert gas on shallow decompression and that's flush the loop with O2 periodically, I am amazed at how few divers I see actually flushing the loop. For sure on an eCCR you can hear the pattern of the solenoid change when you're offgassing shedloads of inerts to the loop on long decos. This also gives the advantage that you're breathing O2 level above setpoint and there's no bouyancy issues with constant solenoid firing.

Quite. The other thing with the regular flushes is that you get to see if the PO2 changes. Once it remains constant for a while, there would (probably) be no more inerts off-gassing. I wouldn't stake the farm on it or anything, but it helps pass the time looking for it on deco.

AM · 7th September 2007, 10:28

Quote: (Originally Posted by Depth-junkie)

Believe it or not i can tell when i am starting to clean up by the soleniod pattern on the 6m hang.

ATB
Gareth

Yup, that's the one! You know you've stayed too long on the bottom when it's firing with every exhale!!!!

Drmike · 7th September 2007, 11:09

Quote: (Originally Posted by Mdemon)

it helps pass the time looking for it on deco.

thats prity much all I do at 6m stop is play with the cells n displays, flush, check the cells, see how long they take to drop, to rise, see what the max reachable ppo2 is...hell what is everyone else doing during those long hangs?

Drmike · 7th September 2007, 11:10

Quote: (Originally Posted by am)

Yup, that's the one! You know you've stayed too long on the bottom when it's firing with every exhale!!!!

yeh I like it when you flush...hold your breath.. .see 1.5 on the display...then exhale and and see it go crashing down to 1.2 lol!

Mdemon · 7th September 2007, 11:15

Quote: (Originally Posted by Drmike)

thats prity much all I do at 6m stop is play with the cells n displays, flush, check the cells, see how long they take to drop, to rise, see what the max reachable ppo2 is...hell what is everyone else doing during those long hangs?

Down here, there has been a serious outbreak of Underwater MP3 players.

**RichClark** · 7th September 2007, 11:24

Quote: (Originally Posted by Drmike)

...hell what is everyone else doing during those long hangs?

Listen to my MP3 player

AM · 7th September 2007, 11:32

I've been known to partake in distributing laminated Porn round the other poor fools on the station

and checking that my deco beer is cooling nicely in my drysuit pocket

UKSteve · 7th September 2007, 11:48

Quote: (Originally Posted by am)

I've been known to partake in distributing laminated Porn round the other poor fools on the station

Must play havoc with the p-valve catheters!!!

S.

7th September 2007, 08:51	#11 (permalink)
AM In love with the big blue Current Rebreather/s: Other CCR Other Rebreather/s: Other CCR Join Date: Feb 2005 Location: Earth. Posts: 611	Re: Following on from the standard bailout mixes thread There's a simple solution to mitigate rebreathing inert gas on shallow decompression and that's flush the loop with O2 periodically, I am amazed at how few divers I see actually flushing the loop. For sure on an eCCR you can hear the pattern of the solenoid change when you're offgassing shedloads of inerts to the loop on long decos. This also gives the advantage that you're breathing O2 level above setpoint and there's no bouyancy issues with constant solenoid firing. As for O2 as a constrictor, this only occurs at certain thermal levels and there are many well documented bends from cooling too much as the blood cannot transport gas, so proper thermal considerations on deep dives is essential. Air breaks - this is just another fallacy created by NOAA plucking numbers out of the air years ago. I won't advocate that other people don't take air breaks, but I never have. But everyone's oxygen tolerance is variable and from day to day it varies, however I have never been a believer in introducing inert gas on decompression, particularly not near ceilings. Regards AnneMarie __________________ Attitude keeps you alive
(Offline)

7th September 2007, 09:50	#12 (permalink)
Depth-junkie 10/52 Psycho Current Rebreather/s: Inspiration Vision Other Rebreather/s: Join Date: Aug 2005 Location: Wrexham Posts: 298	Re: Following on from the standard bailout mixes thread Quote: For sure on an eCCR you can hear the pattern of the solenoid change when you're offgassing shedloads of inerts to the loop on long decos Believe it or not i can tell when i am starting to clean up by the soleniod pattern on the 6m hang. ATB Gareth
(Online)

7th September 2007, 10:18	#13 (permalink)
Mdemon SiegeEngine II Current Rebreather/s: Inspiration Classic Home Build Other Rebreather/s: Inspiration Classic Home Build Join Date: Feb 2007 Location: SWUK Posts: 1,931	Re: Following on from the standard bailout mixes thread Quote: (Originally Posted by am) There's a simple solution to mitigate rebreathing inert gas on shallow decompression and that's flush the loop with O2 periodically, I am amazed at how few divers I see actually flushing the loop. For sure on an eCCR you can hear the pattern of the solenoid change when you're offgassing shedloads of inerts to the loop on long decos. This also gives the advantage that you're breathing O2 level above setpoint and there's no bouyancy issues with constant solenoid firing. Quite. The other thing with the regular flushes is that you get to see if the PO2 changes. Once it remains constant for a while, there would (probably) be no more inerts off-gassing. I wouldn't stake the farm on it or anything, but it helps pass the time looking for it on deco. __________________ www.southwestmafia.com "small minds talk about people, Average Minds Talk About Events, GREAT MINDS TALK ABOUT IDEAS!" The WRONG Attitude will get you killed. "Once the agenda-monkeys and perfect-worlders have moved on, perhaps we can do some diving?"
(Offline)

7th September 2007, 10:28	#14 (permalink)
AM In love with the big blue Current Rebreather/s: Other CCR Other Rebreather/s: Other CCR Join Date: Feb 2005 Location: Earth. Posts: 611	Re: Following on from the standard bailout mixes thread Quote: (Originally Posted by Depth-junkie) Believe it or not i can tell when i am starting to clean up by the soleniod pattern on the 6m hang. ATB Gareth Yup, that's the one! You know you've stayed too long on the bottom when it's firing with every exhale!!!! __________________ Attitude keeps you alive
(Offline)

7th September 2007, 11:09	#15 (permalink)
Drmike Custom Title Allowed! Current Rebreather/s: MK 15.X Ouroboros Other CCR Home Build Other Rebreather/s: Inspiration Classic Other CCR Home Build Join Date: Feb 2005 Posts: 3,303	Re: Following on from the standard bailout mixes thread Quote: (Originally Posted by Mdemon) it helps pass the time looking for it on deco. thats prity much all I do at 6m stop is play with the cells n displays, flush, check the cells, see how long they take to drop, to rise, see what the max reachable ppo2 is...hell what is everyone else doing during those long hangs? __________________ Cave diving is a sport Wreck diving is a sport Diving in general is a sport 'Rebreather diving' is not a sport its the delusional obsession with a highly dangerous and often inappropriate piece of equipment
(Offline)

7th September 2007, 11:10	#16 (permalink)
Drmike Custom Title Allowed! Current Rebreather/s: MK 15.X Ouroboros Other CCR Home Build Other Rebreather/s: Inspiration Classic Other CCR Home Build Join Date: Feb 2005 Posts: 3,303	Re: Following on from the standard bailout mixes thread Quote: (Originally Posted by am) Yup, that's the one! You know you've stayed too long on the bottom when it's firing with every exhale!!!! yeh I like it when you flush...hold your breath.. .see 1.5 on the display...then exhale and and see it go crashing down to 1.2 lol! __________________ Cave diving is a sport Wreck diving is a sport Diving in general is a sport 'Rebreather diving' is not a sport its the delusional obsession with a highly dangerous and often inappropriate piece of equipment
(Offline)

7th September 2007, 11:15	#17 (permalink)
Mdemon SiegeEngine II Current Rebreather/s: Inspiration Classic Home Build Other Rebreather/s: Inspiration Classic Home Build Join Date: Feb 2007 Location: SWUK Posts: 1,931	Re: Following on from the standard bailout mixes thread Quote: (Originally Posted by Drmike) thats prity much all I do at 6m stop is play with the cells n displays, flush, check the cells, see how long they take to drop, to rise, see what the max reachable ppo2 is...hell what is everyone else doing during those long hangs? Down here, there has been a serious outbreak of Underwater MP3 players. __________________ www.southwestmafia.com "small minds talk about people, Average Minds Talk About Events, GREAT MINDS TALK ABOUT IDEAS!" The WRONG Attitude will get you killed. "Once the agenda-monkeys and perfect-worlders have moved on, perhaps we can do some diving?"
(Offline)

7th September 2007, 11:24	#18 (permalink)
RichClark Classic KISS No. 226 Current Rebreather/s: Classic Kiss Other Rebreather/s: Join Date: Mar 2005 Location: Hove, UK Posts: 779	Re: Following on from the standard bailout mixes thread Quote: (Originally Posted by Drmike) ...hell what is everyone else doing during those long hangs? Listen to my MP3 player __________________ The more I learn about women, the more I want to go diving... just don't tell my wife I said that To taste something a little different, try http://www.thechillikitchen.co.uk
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7th September 2007, 11:32	#19 (permalink)
AM In love with the big blue Current Rebreather/s: Other CCR Other Rebreather/s: Other CCR Join Date: Feb 2005 Location: Earth. Posts: 611	Re: Following on from the standard bailout mixes thread I've been known to partake in distributing laminated Porn round the other poor fools on the station and checking that my deco beer is cooling nicely in my drysuit pocket __________________ Attitude keeps you alive
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7th September 2007, 11:48	#20 (permalink)
UKSteve Steve Collard Current Rebreather/s: Inspiration Vision Other Rebreather/s: Join Date: Jul 2005 Location: Weymouth, UK Posts: 606	Re: Following on from the standard bailout mixes thread Quote: (Originally Posted by am) I've been known to partake in distributing laminated Porn round the other poor fools on the station Must play havoc with the p-valve catheters!!! S.
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