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Exceeding NDL on an al80?

Discussion in 'Advanced Scuba Discussions' started by northernone, Apr 13, 2018.

Can your SAC rate allow you to exceed NDLs on an al80?

  1. Yes

    82.4%
  2. No

    7.8%
  3. Not in any likely dive profile

    4.6%
  4. I just want to vote

    5.2%
  1. mainedvr

    mainedvr Instructor, Scuba

    # of Dives: 200 - 499
    Location: Southern CA
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    Anyone that makes a statement like that would worry me to dive with, while it may be true monitoring is what IMHO a competent diver does nothing left to chance. But it is a good question.
     
  2. atdotde

    atdotde Solo Diver

    # of Dives: 200 - 499
    Location: Munich, Germany
    87
    60
    18
    Sure. This is what the displayed ceilings and the heatmap are about. Change the gas for the dive in the equipment tab and those will update.
     
    kelemvor and mi000ke like this.
  3. clownfishsydney

    clownfishsydney Manta Ray

    # of Dives: 2,500 - 4,999
    Location: Sydney Australia
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    On every single dive I do (even on 32%) using an 80 or 100 cf tank I could easily end up in deco and still surface with 80 bar (over 1000 psi). Today I did a bottom time of 29 mins at an average of 26 metres (78 feet) and still came up with 100 bar or almost half a tank. I left the bottom with about 2 minutes to go before deco.

    And to be honest, on most dives, I will go 20 to 30 minutes before I will even check my pressure gauge to see how much air I have left. Why? Because I can tell easily if my air use is even a little over my normal rate and of course I can hear if there is a leak. Most people I dive with operate on a similar basis.
     
  4. mi000ke

    mi000ke Manta Ray

    # of Dives: 100 - 199
    Location: Massachusetts & Grand Cayman Island
    564
    498
    63
    Thanks!
     
  5. NWGratefulDiver

    NWGratefulDiver Mental toss flycoon ScubaBoard Supporter

    # of Dives: 2,500 - 4,999
    Location: Pugetropolis
    65,671
    45,754
    113
    Likewise, Dr. Bill ... but I normally dive tanks with sufficient gas to go into deco and honor the obligation.

    ... Bob (Grateful Diver)
     
    Jim Lapenta likes this.
  6. drbill

    drbill The Lorax for the Kelp Forest Scuba Legend

    # of Dives: 2,500 - 4,999
    Location: Santa Catalina Island, CA
    21,983
    4,570
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    Bob, isn't that what I said?
     
  7. boulderjohn

    boulderjohn Technical Instructor Staff Member

    # of Dives: 1,000 - 2,499
    Location: Boulder, CO
    24,786
    15,711
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    Do you include contingency plans for a loss of gas through, say, a valve malfunction?
     
  8. NWGratefulDiver

    NWGratefulDiver Mental toss flycoon ScubaBoard Supporter

    # of Dives: 2,500 - 4,999
    Location: Pugetropolis
    65,671
    45,754
    113
    ... not in the reply I responded to ... perhaps earlier in the conversation ...

    ... Bob (Grateful Diver)
     
    drbill likes this.
  9. NWGratefulDiver

    NWGratefulDiver Mental toss flycoon ScubaBoard Supporter

    # of Dives: 2,500 - 4,999
    Location: Pugetropolis
    65,671
    45,754
    113
    In my case, yeah ... if I'm not diving with a buddy I'm packing an AL40 pony ... at deco depths it's good for about 30 minutes ...

    ... Bob (Grateful Diver)
     
  10. Jack Hammer

    Jack Hammer Solo Diver

    1,476
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    I think most folks with a lot of dive experience, basically "comfortable in the water", can easily get into some level of mandatory deco at normal recreational depths with an al80. For resort, vacation, or most newer divers I think an al80 will keep them out of deco.
     
    BRT likes this.

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