• Welcome to ScubaBoard


  1. Welcome to ScubaBoard, the world's largest scuba diving community. Registration is not required to read the forums, but we encourage you to join. Joining has its benefits and enables you to participate in the discussions.

    Benefits of registering include

    • Ability to post and comment on topics and discussions.
    • A Free photo gallery to share your dive photos with the world.
    • You can make this box go away

    Joining is quick and easy. Login or Register now by clicking on the button

Double AL80 or LP85

Discussion in 'Tanks, Valves and Bands' started by Compressor, Nov 24, 2018.

  1. Compressor

    Compressor ScubaBoard Supporter Staff Member ScubaBoard Supporter

    # of Dives: 1,000 - 2,499
    Location: NYS
    2,939
    1,404
    113
    Worthington LP85.
     
  2. Scared Silly

    Scared Silly Regular of the Pub

    # of Dives: 500 - 999
    Location: on the path to perdition
    5,557
    1,106
    113
    Here is the bit you need to look at with LP85. If you were to have a BCD failure at depth could you swim your rig to the surface?

    With a steel plate and a wetsuit you are not going to have any weight that can be ditched. At depth you are going to be at least 25 lbs negative.

    If you are using AL80s and an Al plate it is more like 15 lbs negative which is manageable to swim up for many people.
     
    Compressor likes this.
  3. sea_otter

    sea_otter DIR Practitioner

    # of Dives: 200 - 499
    Location: San Jose, CA
    323
    244
    43
    Unless you have a very fluffy body composition, I'm guessing that you're likely already overweight in that configuration. Steel doubles (plus bands, manifold, a second reg) will make that problem worse, potentially dangerously so.

    In a 3mm wetsuit, I'll dive AL80s with an AL backplate and no lead. LP85 tanks, while they can hold more gas, would not be a safe configuration for me. (That said, I dive LP85 doubles exclusively with my drysuit and fluffy undergarments, and I love them.)
     
    Compressor likes this.
  4. rjack321

    rjack321 Captain

    # of Dives: 1,000 - 2,499
    Location: Port Orchard, WA
    9,163
    3,096
    113
    1Ata? 33ft of water? why even bother with doubles, a single at those depths is going to last way over an hour
     
    Compressor likes this.
  5. Compressor

    Compressor ScubaBoard Supporter Staff Member ScubaBoard Supporter

    # of Dives: 1,000 - 2,499
    Location: NYS
    2,939
    1,404
    113
    Appreciate the inputs.
    Yes, will switch to al plate and if I go ahead w setup, will do with the al80s. If water is a bit chillier, then 5 mm suit.

    In colder fresh water, drysuit for sure.
    Most of the dives I make that are shallow last about 2 hours.
     
  6. Compressor

    Compressor ScubaBoard Supporter Staff Member ScubaBoard Supporter

    # of Dives: 1,000 - 2,499
    Location: NYS
    2,939
    1,404
    113
    Conclusion: Each system has its own merits. We use our tools as part of a bigger picture.
     
    lv2dive likes this.
  7. CT-Rich

    CT-Rich Solo Diver

    2,422
    2,256
    113
    For the warm water I would say use the AL tanks. The steel tanks and BP/W are going to make you negative with no ditchable weight. If your BCD has a problem you are overweighted with nothing to ditch. If you were in a dry suit the steel tanks would be the better choice.
     
    rjack321 and Compressor like this.
  8. Compressor

    Compressor ScubaBoard Supporter Staff Member ScubaBoard Supporter

    # of Dives: 1,000 - 2,499
    Location: NYS
    2,939
    1,404
    113
    Exactly.
     
  9. Billy Northrup

    Billy Northrup ScubaBoard Supporter ScubaBoard Supporter

    # of Dives: 1,000 - 2,499
    Location: Key Largo / Norcal
    304
    129
    43
    85's any day of the week, 3300lbs + massively superior.
     
  10. lv2dive

    lv2dive Formerly known as KatePNAtl Staff Member

    # of Dives: I'm a Fish!
    Location: Lake City, FL
    2,726
    1,973
    113
    Im a bit late to this topic but I will throw a few pennies towards the conversation.

    If I were in your fins, I would keep them both - I had the same situation and ended up breaking down the 80’s for use as stages/ deco bottles.

    One thing to note about ocean dives... if you are in a drysuit, you are likely going to be adding weight to the 80’s. I’d rather get that weight from overfilled steel tanks with more gas, than add a v-weight to dbl AL80’s. In a drysuit, you’ve got a solution for backup buoyancy, in a wetsuit, you should personally test your ability to swim either set of tanks up, with appropriate weighting.

    I heard the argument for AL80’s from a NE instructor who was adamant the only solution for OW diving is aluminum tanks, if you need more gas, bring a stage. I’ve heard equally strong perspectives from other instructors in support of the 85’s. As others mentioned and you concluded, it’s really a matter of personal preference.
     
    rjack321 and Compressor like this.

Share This Page