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Doubt about regulators for stages

Discussion in 'DIR' started by duartesss, Oct 7, 2006.

  1. duartesss

    duartesss DIR Practitioner

    # of Dives: 200 - 499
    Location: Portugal
    21
    0
    0
    Hello

    In the stages with high percentage of oxygen (for instance – 80% O2) you use specific regulators (the green ones with O2 clean) or the “normal” regulators can do the job?

    By “normal” regulators I mean good regulators with the usually announce that support 40% O2 …

    Thanks
    Duarte S.
     
  2. Captain CaveMan

    Captain CaveMan Manta Ray

    # of Dives: I'm a Fish!
    Location: S.w. Chicago, Il
    688
    1
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    Posting in two sections is not allowed. Do you want a DIR answer or a Reg answer. O never mind this is Scubaboard all post are going to be DIR :(
     
  3. toodles

    toodles DIR Practitioner

    130
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  4. duartesss

    duartesss DIR Practitioner

    # of Dives: 200 - 499
    Location: Portugal
    21
    0
    0

    Sorry for that.

    I'm new here and I'm just learning about the ScubaBoard structure...

    First I only saw the Regulators section and I posted there. Only after I saw the DIR section.

    I want to be a DIR diver. This is why I put the question here.

    Thanks
    Duarte S.
     
  5. DIR-Atlanta

    DIR-Atlanta Manta Ray

    576
    2
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    Absolutely correct - DIR specifies 100% O2 for the shallowest stops. duartesss, you should do some research on the "oxygen window" if you are curious as to why.

    There have been some notable incidents involving titanium first stages, so I would stay away from those.

    Regarding the concept of "O2 clean", that is a dive industry myth. There is virtually no way to make a reg O2 clean, at last not in any dive shop that I have ever been in (no "clean room", etc). There is some merit to rebuilding a reg with oxygen compatible parts and lubricants (Viton O-rings, Krytox, etc), but to claim that this somehow makes it "O2 clean" is misleading.

    Most regs are OK to use with pure O2 right out of the box, but be aware that high O2 content accelerates the wear on the internal soft parts of the regulators. Greater care must be taken with any routine maintenance to insure that everything remains in good working order.
     
  6. duartesss

    duartesss DIR Practitioner

    # of Dives: 200 - 499
    Location: Portugal
    21
    0
    0
    I think that I know some that use. They are DIR-F and Tech 1. But I will confirm that.


    I know some technical divers that use that "green regs", but they are not DIR divers. Then, this is a DIR question or not?. I know that DIR not means technical diving, but when we use stages, generally ,is to do tech dives and there are different things from a DIR perspective and a no DIR perspective... .

    For instance, i know technical divers that use one or two VR3 computers.... ;-)

    Thanks
    Duartesss
     
  7. Soggy

    Soggy Dive Shop

    # of Dives: 200 - 499
    Location: Natick, MA
    5,458
    0
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    80% is absolutely not a DIR/GUE/WKPP mix. Anyone can do whatever they want after class, but that doesn't mean they are doing what they were taught.

    The GUE standard deco mixes are:
    100%
    50%
    35/25
    21/35

    The GUE standard bottom mixes are:
    32%
    30/30
    21/35
    18/45
    15/55
    10/70

    Anything outside of those mixes is not DIR. There are lots of resources around that explain why standard mixes (and these standard mixes, specifically) are used.



    Color should never be used to identify a gas. First, color disappears with depth, secondly, people make mistakes and can put the wrong reg on the wrong bottle. The only way to indentify the gas you are switching to is by finding the MOD on the bottle itself and following it to the reg.

    DIR divers do not use computers...just a bottom timer in gauge mode.
     

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