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Redundant air with SM configuration

Discussion in 'Solo Divers' started by Bent Benny, Sep 21, 2018.

  1. rddvet

    rddvet DIR Practitioner

    # of Dives: 50 - 99
    Location: Florida
    I guess this is what happens now that sidemount has been mainstream in the ow world for more than a couple years- a poor understanding of it's most basic principles.
  2. soggybadger

    soggybadger Barracuda

    # of Dives: 50 - 99
    Location: United Kingdom
    possibly one or two individual cases but the majority of us who have recently been trained in side mount are very well aware of balancing the gas use between tanks.
  3. Coztick

    Coztick Barracuda

    # of Dives: 50 - 99
    Location: calgary
    For deeper, colder, drysuit dives I will take 2 full sized tanks but most often it's just 1 80cu and a 13cu for warm, clear water.
    Regardless of the amount of gas taken, you should KNOW how much gas you have at all times!
    Maintaining a set amount in 2 separate systems is redundancy.
    Try your 19cu with a single for the shallow stuff and let your single tank buddy sling it for deeper dives.
    There is no need for you to be managing three tanks.
    I gotta wonder, if you breathe down 2 full sized tanks, aren't you gonna have a DECO obligation that your 19cu won't suppy?
    A.S.H. and soggybadger like this.
  4. Bent Benny

    Bent Benny Nassau Grouper

    # of Dives: 50 - 99
    Location: Criehaven Island, Maine
    I don't breathe through both tanks I was just trying to make sure I have all of my bases covered with regards to redundancy. Of the 8 or so SM dives I have done so far I have been alternating tanks, but that was more just to practice switching tanks, I didn't know it was the way it was supposed to be done.

    I bought the SM course on sidemounting.com but I haven't gotten through all of it yet.
    Coztick and soggybadger like this.
  5. Dirty-Dog

    Dirty-Dog Frequently Censored ScubaBoard Supporter

    # of Dives: 500 - 999
    Location: Pueblo West, CO, USA
    Probably, yes. But it depends on how big a hoover you are. I once saw a guy blow through an AL80 in 12 minutes, and never get below 30'.
    A.S.H. and soggybadger like this.
  6. RyanT

    RyanT Solo Diver

    # of Dives: 500 - 999
    Location: Maryland
    The other folks here have pretty much already said it, but it really comes down to gas management. Take notes to calculate your gas consumption on a typical dive. Once you've done this a bit, you'll get a good average. Then you can plug in that number to a dive planning software and see how much gas you'll consume on a given dive. In the software you can tweak your bottom times to ensure you have enough gas in reserve in the event that things go sideways.
    Bent Benny likes this.
  7. A.S.H.

    A.S.H. Solo Diver

    # of Dives: 50 - 99
    Location: Deep East Texas
  8. kafkaland

    kafkaland Barracuda

    # of Dives: 200 - 499
    Location: Saline, Michigan
    Perhaps that's the reason for the confusion? Gas planning is usually covered early in the classroom portion of any sidemount course with any instructor I know of.
    shoredivr likes this.
  9. JohnnyC

    JohnnyC Divemaster

    # of Dives: 0 - 24
    Location: United States
    OP, you need to take an actual sidemount class with an actual sidemount instructor, not one of those self-certifying PADI types.

    I had assumed you were just diving sidemount gear in what's essentially single tank diving but with a "really big pony," something I disagree with but accept that some people do this, but it seems like you're confused with the entire concept of sidemount diving at a very basic level.

    Even a single day of instruction will significantly help you out and get you set on the right path. This isn't a judgement, you dive how you want to dive, but you'll be significantly more successful with some actual instruction.
  10. Norwegian Cave Diver

    Norwegian Cave Diver Barracuda

    # of Dives: 200 - 499
    Location: Calgary Alberta Canada
    The rule is to keep the tanks within 400 lbs if each other. If you begin with left tank 3000 - 400= 2600. Right tank 3000-800=2200. Left tank 2600-800=1800. Right tank 2200-800=1400. And continue. As a cave diver we dive by different gas management rules that an open water diver.

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