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Mistakes on Rebreathers

Discussion in 'Rebreather Diving' started by Mermaiden_RB, Jul 29, 2019.

  1. Mermaiden_RB

    Mermaiden_RB Garibaldi

    # of Dives: 200 - 499
    Location: Mexico
    3
    1
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    I am a new rebreather diver and would like to hear other people's recommendations for a new RB diver and what mistakes have you have made on such a machine?

    Asking to become wiser and better.

    English is not my native language, so sorry for that.
     
  2. beester

    beester DIR Practitioner

    # of Dives: 1,000 - 2,499
    Location: Belgium / Italy
    695
    416
    63
    Following this! Not enough experience on to give valid advice (only have about 50 hours on my machine).

    As a fellow beginning CCR diver I would say:
    - Checklists always!
    - Manage your loop (min volume, exhale out of your loop prior to ascending)
    - Go around stuff not over :p
     
    doctormike likes this.
  3. kensuf

    kensuf Cave Instructor

    2,061
    2,692
    113
    Not following my check-list because "I've done this enough times" then having a mushroom valve fail during a dive (giving me a co2 fun time) because I forgot to do a stereo test.

    Not following my check-list because "I've done this enough times" and then forgetting to connect my O2 feed to my unit -- I did catch this on my pos/neg test.

    Not having my t-pieces fully connected (caught this on a pos/neg, see check-lists are good).
     
    tbone1004 likes this.
  4. Reku

    Reku Solo Diver

    # of Dives: 5,000 - ∞
    Location: Great Lakes + Northern Florida + Marsh Harbor
    864
    309
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    I've forgotten to turn on the o2 - that was a bad time.

    I've forgotten to turn on the dil - that also sucked.

    I've forgotten to bring a spare cell to the dive site - not good but not a major issue - I'm ok with only seeing 2 cells.

    I've had loose lips and flooded my sidekick when I first started diving it.

    I've adjusted my adv wrong and then it freeflowed - THE ENTIRE DIVE. very annoying - but not a major issue.

    After a flood I neglected to clean my rb head right after the dive and the wet sorb hardened into place - that was VERY HARD TO CLEAN.

    I've neglected to replace hoses every year or so and have had a few fail.

    my advice to you is do your 5min prebreathe and always clean the unit after dives and keep up on the maintenance of the unit and use a checklist.
     
  5. The Chairman

    The Chairman Chairman of the Board

    # of Dives: I just don't log dives
    Location: Cave Country!
    56,286
    24,037
    113
    I have been certified on a few rebreathers, and bought the one I felt was the most fault tolerant on the market: the SF2. It has served me well, and while I haven't really made a huge mistake on it, I feel that's due to the design as much as my attention to detail.

    The only real mistake was being totally under-weighted to the point I did not have enough dil in the loop to breathe when I lightened everything up enough to descend. Whoops! :D :D :D
     
  6. The Chairman

    The Chairman Chairman of the Board

    # of Dives: I just don't log dives
    Location: Cave Country!
    56,286
    24,037
    113
    I would love to see your SF2 checklist. Can you send it to me?
     
  7. hroark2112

    hroark2112 Tech Instructor

    # of Dives: 0 - 24
    Location: Raleigh, NC
    1,303
    1,205
    113
    Never dive with a known issue. Do not allow complacency to set in. It can and will kill you.
     
    TTPaws, RyanT and RainPilot like this.
  8. _Ralph

    _Ralph Manta Ray

    506
    213
    43
    Only have had a few issues (so far)

    Loose mouthpiece ziptie (not able to tell from a pos/neg test) dive was doable and annoying

    Gas not turned on (first ever CCR ‘try dive’ dropped down 5ft, reached down and turned on the valve) unit in SCR mode. Gave the instructor the finger, smiled and carried on.

    DIL Hose fitting on head worked loose at 45m... shut down and assess.

    Had my weight dialed in, took a 40day SI, added a thin heated vest for the 3C water, stole a dozen lbs after I couldn’t sink, then still couldn’t sink, 3hr drive home...

    _R
     
  9. Jeremy Williams

    Jeremy Williams Nassau Grouper

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    Mouth position. Basically I didn’t realize that I had developed a really sloppy way of holding a second stage in my mouth. It’s really terrible on the loop. Water in the loop hose is super annoying. You need a good seal on the loop all the time.
     
  10. taimen

    taimen ScubaBoard Supporter ScubaBoard Supporter

    # of Dives: 200 - 499
    Location: Europe
    772
    379
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    This. After getting used to shedding weight with OC I was obsessive with avoiding being "overweight" with rb. Add two 80cf bailouts, breathing them really light during a bailout drill, and I had an unforgettable lesson about proper weighting. I must carry enough weight to handle bailouts also almost empty when they are clearly positive in water. In a real emergency you can always ditch empty cylinders and get new heavier ones from your team but that requires a lot of practice. The psychological barrier to get rid of a light cylinder with any gas in it is really high. I think this aspect of proper weighting wasn't discussed enough (at least in my training) until I started overhead training. If diving with only a single bailout, you must be able to hold a stop with that until empty. I know divers who can't get underwater without two full bailouts. I haven't seen how they manage a real bailout in that config.

    So practice proper bailouts. Not only switching to bailout, but also real long (simulated) deco on BO including gas switches.

    Please share your experience, how do you do/teach weight check with a rebreather for different configurations and dives!
     
    RyanT likes this.

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