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Thread: O2 Flushing During Deco

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    O2 Flushing During Deco

    I have been trying to become more efficient with my gas consumption. Along these lines, I am thinking about O2 flushing procedures that balance offgassing with gas consumption.

    So far, what I am doing is flushing with oxygen two or three times upon arrival at my 20 foot stop. Then, considering that I am probably offgassing a fair amount of Helium, I flush again after two to three minutes. After that, I flush after about five more minutes. Then, I might do it again after about ten minutes.

    I was just curious as to how often everyone flushes with oxygen upon arrival at the shallow stop. Maybe I am doing some overkill here.

    Thanks for any suggestions.

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    Re: O2 Flushing During Deco

    In the beginning of 20ft/6m stop I usually flush 2-3 times to get the ppO2 up. After that I flush when it drops to around 1,35-1,4.

    Sometimes if I want to do a better check on the cells I might do a partial flush at 9m. There I can see that the cells can go higher than 1,6.

    JH

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    Re: O2 Flushing During Deco

    Normally i tend to close my adv at 6m and add o2 keeping the ppo2 at 1,4 througout the deco,i dont do any "real Flushes"

    Regards Allan

    Offcourse a cellcheck will regard a higher pp02, i use 1,6 as my reference, then i know that my cells are able to sound the acoustic alarm.
    Last edited by Allan_o; 22nd September 2006 at 07:08.

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    Re: O2 Flushing During Deco

    I dive a classic kiss and I always turn of my dil when I get to my 6m stop and flush 3 times, I find this works for me. I then push the PP02 up to 1.4 I dive with a VR3 set to 1.2 I then push it up again when it starts to drop below 1.25/1.3.

    Louis

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    Re: O2 Flushing During Deco

    I flush lots. O2 is cheap and it gives me something to do.

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    Re: O2 Flushing During Deco

    I remember we discussed this many moons ago. I cant find the discussion where we actually calculated the volume of gas but found some equally interesting and relevant conversations;
    http://www.rebreatherworld.com/showthread.php?t=448

    http://www.rebreatherworld.com/showthread.php?t=1247
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    Re: O2 Flushing During Deco

    when on deco from 6m ans some tine 9m I close the hydrogom and connect ADV on an external O2 bottle ( so dont need to reboost my smalls inboard O2 bottle too frequently ).
    Then I notice that is quite impossible to have a stable higher PPO2 than 1.3 at 6m (till the level of inert gas is high inside my body I think ).
    But at the end of the deco ( I always use very conservative tables except if I have some problem, then turn on a shorter way) I notice that I get a good 1.6 and I am very pleased when I can go out water in such a situation ( guess I have done a good and rather complete deco , if no error done before).

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    Re: O2 Flushing During Deco

    I don't flush with O2 much anymore. I ususlly run my Classic Kiss at about 1.2 during the dive and 1.3 to 1.4 on deco. I have found on some deeper/longer dives that the high PO2 I was using on ascent was giving me a high CNS.
    I would prefer to hang just a couple of minutes longer than push the CNS. I have not found the difference worth the risk.

    I do however flush one at the end of my dive to check cells and prepare the unit to have a high PO2 on the surface as I get onboard the boat.

    Louis, I'm not sure that tuning off the dil is such a great idea. Especially if you are flushing the loop with O2. What if you needed to do a quick flush if you felt like you had symptoms of oxtox? Or if you needed to do a quick descent to help someone and forgot to turn it back on?

    Regards, Peter

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    Re: O2 Flushing During Deco

    Quote Originally Posted by Marc T  View Original Post
    But at the end of the deco ( I always use very conservative tables except if I have some problem, then turn on a shorter way) I notice that I get a good 1.6 and I am very pleased when I can go out water in such a situation ( guess I have done a good and rather complete deco , if no error done before).
    Watching for a stable PO2 is a nice way of checking you've done enough deco.

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    Re: O2 Flushing During Deco

    Quote Originally Posted by Peter Piemonte  View Original Post
    I'm not sure that tuning off the dil is such a great idea. Especially if you are flushing the loop with O2. What if you needed to do a quick flush if you felt like you had symptoms of oxtox? Or if you needed to do a quick descent to help someone and forgot to turn it back on?
    How long does it take to turn the tank on ? About 1 sec ?

    You can't effectively descent if your diluent is not pressurized because you won't be able to get a full breath in just a few meters. Then reach back and turn the tank on while carry on with the descent...

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