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Twin-set manifold vs Sidemount vs Independent Twins

Discussion in 'Basic Scuba Discussions' started by BlueTrin, Jan 5, 2019.

  1. JohnnyC

    JohnnyC PADI Pro

    # of Dives: I'm a Fish!
    Location: United States
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    BM doubles unless you need SM for the overhead profile. CCR is way down the road for you. Independent doubles never. Manifold failures are so rare I would posit they are statistically insignificant. I'm not aware of anybody who has actually ever died because of a manifold failure. (Not opening the manifold is not a failure btw.....)
     
  2. ChuckP

    ChuckP Manta Ray

    # of Dives: 200 - 499
    Location: Cozumel
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    I've never trained or dove side mount but that thought has crossed my mind - if I was sure to drown because of an empty tank but yet carrying a partial tank with a bad first or second stage on it - I'd attempt changing first stage regulators out while holding my breath (blowing bubbles) - better yet, with a buddy, share air while switching.

    Why not try it?
     
  3. divad

    divad ScubaBoard Sponsor ScubaBoard Sponsor

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    Thanks again. I was almost apoplectic......again.
     
  4. Caveeagle

    Caveeagle Rebreather Pilot

    # of Dives: 500 - 999
    Location: High Springs, FL
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    Diving to 1/3s and depth demands more gas. Even if you have a great sac rate.

    And “2 buddies are safer than one!” ....can you back that up? It has been my experience that team interreliance and communication tends to break down with teams of more than two. It’s hard to keep track of two divers in the water, so it’s real easy for a 3rd wheel to fall out of the group.

    More than you might think. I consider myself to be an intermediate level cave diver, and have frequented a few “sidemount only” caves. However, I agree with your point. I see plenty of SM divers that don’t go anywhere near some of the small and tight caves that really require this configuration.
     
  5. tarponchik

    tarponchik Loggerhead Turtle

    # of Dives: 500 - 999
    Location: USA
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    Take it easy, I was kidding.
     
  6. Caveeagle

    Caveeagle Rebreather Pilot

    # of Dives: 500 - 999
    Location: High Springs, FL
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    We’re you kidding on both comments? ....my sarcasm meter has been broken for quite some time,,, :(
     
  7. tarponchik

    tarponchik Loggerhead Turtle

    # of Dives: 500 - 999
    Location: USA
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    Only on this one. With a single tank, 3K PSI at 60+ ft, I go into deco long before I run out of air. To run out of air instead, this has to be very shallow diving, like shore diving in SE Florida, Dania Beach or LBTS. But about 2 hr dive there is enough for me anyway.

    So, the PO should be aware that increasing bottom times by taking more air will likely result in deco dives.
     
  8. Caveeagle

    Caveeagle Rebreather Pilot

    # of Dives: 500 - 999
    Location: High Springs, FL
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    When someone is talking about moving into doubles for eventual move into wreck & cave diving, some exposure to decompression is absolutely posible. Having said that, there are some caves where the depths are quite moderate, and penetration approaching 2k linear ft is possible using EAN32, with little to no deco. Peacock/peanut tunnel is one example. Would I do that dive without big double tanks.... umm. No.
     
  9. RainPilot

    RainPilot OC/CCR Instructor Trainer Staff Member ScubaBoard Supporter

    # of Dives: I just don't log dives
    Location: UAE
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    I keep exit gas in both tanks so a single failure won't scupper my plan. If my exit is super critical, then my Z-system allows me to use both tanks in the event of a second stage complete failure. All my second stages are also strippable underwater so a diaphragm issue should be somewhat easily solved.
     
  10. sigxbill

    sigxbill Tech Instructor

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    to the op: twinset manifolded vs twinset Indies was debated and overwhelmingly decided 30 years ago, and if you research that, it may help you with your sidemount question .... cheers
     

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