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Deco Tables

Discussion in 'Technical Diving' started by Meister481, Oct 24, 2006.

  1. Meister481

    Meister481 Tech Instructor

    # of Dives: 0 - 24
    Location: Greenwood, Indiana
    642
    4
    I'm a newbie tech diver looking for a set of accelerated decompression tables that have the ability to use 50-75-100 deco gasses. I did some searching and nothing current came up. I've seen the IANTD set, but I want an all encompassing backup in case the deffication encounters the oscillation. This would be in case of a snafu that causes significant plan deviation. Cursory planning could be made on site with these as well.

    I have a nitek HE as insurance/quick check but I'd like something else as a backup to carrying too many preprinted v-planner tables.
     
  2. Bigcape

    Bigcape Solo Diver

    # of Dives: 200 - 499
    Location: Austin, Tx.
    228
    0
    I have been serching for tables too. I dont have your answer but I was curious if you settle a debate as to the NDL limit on a Ean mix of 36% at 60 and 70 fsw?
     
  3. Rick Murchison

    Rick Murchison Trusty Shellback ScubaBoard Supporter

    # of Dives: 2,500 - 4,999
    Location: Gulf of Mexico
    13,348
    555
    Why not just use the ones that came with your accelerated Deco course?
    There are other sources you can use to generate your own custom tables, but these too will be covered in any course that covers accelerated Deco.
    Rick
     
  4. Rick Murchison

    Rick Murchison Trusty Shellback ScubaBoard Supporter

    # of Dives: 2,500 - 4,999
    Location: Gulf of Mexico
    13,348
    555
    Depends on which tables you use. If you use EAD and the Navy Tables with Doppler Limits, then 70 minutes & 50 minutes respectively. If you use the NOAA Nitrox II table, 100 minutes. Other tables will yield other results
    Rick
     
  5. Bigcape

    Bigcape Solo Diver

    # of Dives: 200 - 499
    Location: Austin, Tx.
    228
    0
    Check your pm


    my tables show 170mins at 60fsw with a 36% mix. The extra 70 mins will get you bent. this requires a 29min deco stop at 10fsw!!!!!!!!!!!!!!!!!!!!
     
  6. Rick Murchison

    Rick Murchison Trusty Shellback ScubaBoard Supporter

    # of Dives: 2,500 - 4,999
    Location: Gulf of Mexico
    13,348
    555
    Oh, I wouldn't get tooo excited yet. At 60 ft you have an EAD of only 42 feet. At 40 feet the NDL is 200 minutes on the Navy table... so an algorithm that recalculates every foot could easily yield 170 for an EAD of 42 ft.
    A quick V-Planner run (nominal) of EAN 36 at 60 fsw and 170 minutes indicates no deco required.
    It's probably just fine :) (I mean, aside from the tanks you'll have to take along for that length dive at that depth)
    Rick
     
  7. *Floater*

    *Floater* Solo Diver

    # of Dives: 100 - 199
    Location: Here, there and everywhere
    2,428
    3
    It's an "NDL" dive on my GAP-RGBM dive planner. No stops required even on the conservative setting. Basically same with Buhlmann albeit with a 2 minute safety or deco stop at 10 feet. Of course if you add gradient factors then the results change depending on your settings.
     
  8. Bigcape

    Bigcape Solo Diver

    # of Dives: 200 - 499
    Location: Austin, Tx.
    228
    0
    Then who is right and who is wrong. NOAA tables require a 29 min stop at 10 feet and if you do the EAD conversion from 36% you would need to a 21+ min stop on the air tables.

    If that is the case then you might as well do 90mins on air at 70 ft and ignore the 23min stop at 10ft as well

    I am not following the logic.
     
  9. *Floater*

    *Floater* Solo Diver

    # of Dives: 100 - 199
    Location: Here, there and everywhere
    2,428
    3
    I made my own backup tables using my deco program (GAP). I don't write complete schedules out, just the required total deco into a table in my wetnotes with time increments on the horizontal and depth increments on the vertical for a given set of gases (air for bottom gas and EAN50 for deco in my case). The deco curve is always pretty much the same for my dives so I just need to know the total required deco time and then I can divide it into roughly the right shape.
     
  10. texdiveguy

    texdiveguy Contributor Rest in Peace

    # of Dives: 500 - 999
    Location: DFW,Texas
    6,965
    26
    I plan all my dives and dive the plan. I also carry IANTD set for on the fly plan changes while on the road. But in most part I cut custom tables around the planned dive.
     

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