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Do you think Nitrox is a deep diving gas?

Discussion in 'Advanced Scuba Discussions' started by diverdowndude, Jul 26, 2009.

Is nitrox with O2 greater than air a deep diving gas?

  1. Yes

    39 vote(s)
    12.6%
  2. No

    244 vote(s)
    79.0%
  3. Are you Nitrox certified?

    150 vote(s)
    48.5%
  1. rstofer

    rstofer Loggerhead Turtle

    # of Dives: 100 - 199
    Location: Northern California
    2,199
    3
    0
    You can reach the recreational limit of 130' with EAN28 and extend the NDL somewhat. I guess that qualifies as a 'deep diving' gas within recreational guidelines.

    Richard
     
  2. diverdowndude

    diverdowndude Solo Diver

    # of Dives:
    Location: Mid Atlantic
    90
    0
    0
    lets keep the discussion in the 99fsw-140fsw range. Divers choice of O2 with no He
     
  3. MaxBottomtime

    MaxBottomtime Divemaster

    # of Dives: 1,000 - 2,499
    Location: Torrance, CA
    8,802
    7,833
    113
    Statistics prove that there has been no reduction in DCS cases when using Nitrox. Theoretically, you stand a better chance due to less nitrogen, but air tables and computers are so conservative that the risk of DSC is already low.
    As ptyx said, cost, availability and training are good arguments. The majority of dives I make are beach dives in less than seventy feet. I'm not going to spend more than twice the cost of air for those dives. When I make wreck dives I'm usually deeper than Nitrox allows, so I use 50% and 100% O2 for deco gasses.
    The only dives I use Nitrox on are working dives such as net removal when I want to spend more time on the bottom with less deco.
     
    Last edited: Jul 26, 2009
  4. Rhone Man

    Rhone Man Divemaster

    # of Dives: 1,000 - 2,499
    Location: British Virgin Islands
    11,281
    10,623
    113
    Surely Nitrox is a mandatory gas for serious deep diving?

    Just obviously not for use as a bottom mix.
     
  5. Rhone Man

    Rhone Man Divemaster

    # of Dives: 1,000 - 2,499
    Location: British Virgin Islands
    11,281
    10,623
    113
    I have heard this many times before, and I have also heard that dive computers have not produced a noticeable decrease in incidents of DCS.

    I am reminded of a report I once read about child injuries in road traffic accidents in the UK. When car seats became mandatory the incidents of death and serious injury remain roughly constant. The theory is that the same drivers who used to be very careful with kids in the car suddenly felt much more comfortable about overtaking or exceeding speed limits because they now believed that their child was safely strapped in.
     
  6. String

    String Master Instructor

    # of Dives: I just don't log dives
    Location: Grand Cayman
    8,505
    359
    83
    Nitrox is a shallow diving gas. The deeper you go the less and less useful it becomes until there are no advantages to usingit over air. As a back gas anyway

    As a deco gas it has a place in deep diving.
     
  7. Thalassamania

    Thalassamania Diving Polymath ScubaBoard Supporter

    # of Dives: 5,000 - ∞
    Location: On a large pile of smokin' A'a, the most isolated
    22,171
    2,770
    113
    Kinda depends on your definition of deep.
     
  8. Marvel

    Marvel Just me ScubaBoard Supporter

    # of Dives: 500 - 999
    Location: Lauderdale By The Sea
    4,189
    5
    0
    Pity you don't have a Fill Express nearby. Same price for air or Nitrox.
     
  9. Thalassamania

    Thalassamania Diving Polymath ScubaBoard Supporter

    # of Dives: 5,000 - ∞
    Location: On a large pile of smokin' A'a, the most isolated
    22,171
    2,770
    113
    I'd be interested to see those statistics. Do they indicate that diving EAN on air tables is a waste of time, or that pushing EAN to on EAN tables has the same level or risk as pushing air to air limits? Two rather different issues with understandably different answers.
     
  10. MaxBottomtime

    MaxBottomtime Divemaster

    # of Dives: 1,000 - 2,499
    Location: Torrance, CA
    8,802
    7,833
    113
    From the PADI Enriched Air Diver Manual;
    "the DCI incidence rate is already so low in recreational diving that simply reducing nitrogen is unlikely to produce a meaningful safety improvement. Although there's been no experimental study of this, statistical estimates suggest that using enriched air within normal air limits only reduces the incidence rate a fraction of a percent. There is some risk reduction (mathematecally) if you use enriched air within air no decompression limits, but probably not a realistic, significant safety improvement from a practical point of view."
     

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