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Nitrox Rule of Thumb 32 vs 40

Discussion in 'SSI: Scuba Schools International' started by apivonka, Jul 29, 2018.

  1. The Chairman

    The Chairman Chairman of the Board

    # of Dives: I just don't log dives
    Location: Cave Country!
    I would definitely go with @Dr Simon Mitchell over me on anything to do with physiology. :D
    uncfnp and CuzzA like this.
  2. tomfcrist

    tomfcrist NAUI Instructor

    # of Dives: I'm a Fish!
    Location: Virginia, USA
    Note the last line of his post.
  3. uncfnp

    uncfnp Solo Diver

    # of Dives: 500 - 999
    Location: North Carolina
    I did as I am sure you noted the first. One does not negate the other.
  4. IncreaseMyT

    IncreaseMyT Banned

    # of Dives: 200 - 499
    Location: Naples, FL
    Yea but my thing is, I don’t think it will give you enough extra bottom time based on your air. I think you would still run out of air first.
  5. CuzzA

    CuzzA Solo Diver

    Depends on what kind of tank you're using. Last time out I could just barely squeeze three NDL dives on the grounds from a HP100. Most of the time I could only get two while my infinitely more experienced buddies were getting three.
    IncreaseMyT likes this.
  6. rick00001967

    rick00001967 Tech Instructor

    # of Dives: 500 - 999
    Location: canada
    SSI does......until the diver gains the confidence and comfort level along with proper training, it is "recommended" to stay shallower than 100 feet.
  7. Lorenzoid

    Lorenzoid idling in neutral buoyancy ScubaBoard Supporter

    # of Dives: I just don't log dives
    Location: Atlanta, USA
    "Many Nitrox divers make life even easier. They pick EAN40 for all dives shallower than 30 m/99 ft as this gives the most bottom time and pick EAN32 for dives right up to the maximum sport diving depth limit of 40 m/132 ft."

    Most dives don't involve a diver getting to "pick" their mix at all. At a dive resort or on a liveaboard, you will pick up a pre-filled tank of whatever they bank, and it's almost always going to be EAN32. If you do happen across a dive shop that will offer EAN40, and that's what you are seeking, it probably won't make your "life even easier" because you will have to wait for them to custom mix it for you. John mentioned some dive shop in FL banking EAN40, but that has to be extremely unusual among all the dive shops worldwide. I am what you would call a typical traveling recreational diver, and in something approaching 500 dives I can count on one hand the number of times I have been offered anything but EAN32 without making myself into a special case to be dealt with separately from all the other divers.

    Fine question from an academic perspective, though.
    rick00001967 likes this.

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