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15l tanks

Discussion in 'Cozumel' started by flyboy08, Nov 28, 2019.

  1. ChuckP

    ChuckP Manta Ray

    # of Dives: 200 - 499
    Location: Cozumel
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    Besides - the marina is so entertaining, morning and afternoon. It’s nice to have the lazy stroll out the dock for pickup, but a beer with the boys at 8am is like nothing else!
     
    couv and cvchief like this.
  2. cvchief

    cvchief ScubaBoard Supporter ScubaBoard Supporter

    # of Dives: 200 - 499
    Location: Cozumel & Pennsylvania
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    3316d063fd23fcd471c69f7f04c807b7.jpg
     
    couv and ChuckP like this.
  3. GameChanger

    GameChanger Professional Photographer

    # of Dives: 500 - 999
    Location: Frisco, TX USA
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    I used AL100's (Nx) on my August 2019 trip with Blue Angel. I just checked my dive logs and 10 dives averaged fills of 3124 psi. I am a big guy in great shape (64 yrs young) and I can be a bit of a gas hog.
    It may have been an oversight, but Blue Angel did not charge me anything extra for the AL1OO'S. All they added was the Nx fee and I think it was an additional $10.
     
  4. cvchief

    cvchief ScubaBoard Supporter ScubaBoard Supporter

    # of Dives: 200 - 499
    Location: Cozumel & Pennsylvania
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    3124 is still lower than 3300 operating pressure, but better than the typical Merry-D. Does Blue Angel fill their own?
     
  5. Coztick

    Coztick Barracuda

    # of Dives: 50 - 99
    Location: calgary
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    When in Cozumel, I carry a 13 cuft pony.
    If conditions are good, I consider it to be enough gas for me to ascend with at the end of the dive.
    Rather than ascending at the 1000 psi point, I am comfortable with 600psi or even 500psi if the dive ends shallower than 50 ft.
    This extends my bottom time by at least 10 min. every dive.
    It's not why I have it, but it does make it worth the little trouble it takes.
     
  6. JackD342

    JackD342 Dive Shop

    # of Dives: 500 - 999
    Location: Highland Park, IL
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    I disagree. First, it is not obvious to me what the 15L tanks are. If steel, then definitely more negative, not less.
    If they are actually 100cf aluminum, then I still expect them to be 1-2 pounds lighter than a current standard AL80. (not a neutral 80, with service pressure of 3300 psi) An AL100 is about 13L.
    Not every manufacturer has identical specs, but for the North American suppliers I have looked at the AL80 is always the most buoyant tank in each current line up, across all sizes, with one exception. Metal Impact makes an AL72 that is +3.5 pounds at 500 psi, versus +3.3 for their AL80. (Still darn close to a tie there.)
     
  7. ChuckP

    ChuckP Manta Ray

    # of Dives: 200 - 499
    Location: Cozumel
    720
    551
    93
    Well, maybe so..... @DandyDon dives em, what do you do for weight. From this chart, I’d say dive the same weight at first. The 80’s are luxfer for sure and guessing the 100’s are too - aluminum

    upload_2019-12-2_17-26-39.png upload_2019-12-2_17-26-39.jpeg
     
  8. GameChanger

    GameChanger Professional Photographer

    # of Dives: 500 - 999
    Location: Frisco, TX USA
    117
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    They do not.
     
  9. Dave Dillehay

    Dave Dillehay Dive Shop

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    As a standard Meridiano 87 fills ALL aluminum tanks to 3000 PS. If you got 3145 that was an accident, but even then it is not 100cf. There is a good reason that Aldora pays 3 times as much for Steel HP 120 tanks, with lots more for maintenance--and has their own fill station.

    In addition, THE Steel HP 120s have ideal buoyancy characteristics compared to any other tank.


    Bear in mind that there is a huge difference between high pressure steel 120s and Low pressure 120s.

    Dig into the above charts and others,and you will see that when full the hp 120s have more weight to get down easy, then never positive at the safety stop. For example, depending on brand the aluminum 100 may be as much as +7.8 pounds buoyant. When diving HP 120s most divers take 4 lbs off the weight belt when compared to Aluminum 80s. Aluminum 100s better add 4 lbs.

    One more thing, the bulk of the Aluminum 100 or low pressure steel 120s is difficult to dive with. In fact it is my belief that dealing with the bulk of them may cause more divers to use up any extra air to be found in the tank.


    Dave Dillehay

    Not my money but I could debate this forever.
     
    Jayfarmlaw likes this.
  10. ggunn

    ggunn ScubaBoard Supporter ScubaBoard Supporter

    # of Dives: 500 - 999
    Location: Austin, TX, USA
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    You missed that I said "might"? :D
     

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