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DIR mental math for gas consumption

Discussion in 'Advanced Scuba Discussions' started by dave22387, Nov 20, 2018.

  1. rjack321

    rjack321 Captain

    # of Dives: 1,000 - 2,499
    Location: Port Orchard, WA
    you'd be surprised at the number of times this happens at fill stations
  2. EireDiver606

    EireDiver606 DIR Practitioner

    Yeah that’s a scary invisible danger unless you do your proper pre dive checks. It’s crazy but true unfortunately. Have you ever had to to lecture someone on that?
  3. boulderjohn

    boulderjohn Technical Instructor ScubaBoard Supporter

    # of Dives: 1,000 - 2,499
    Location: Boulder, CO
    All over the world you will find dive dive shops that never have a reason to fill doubles, and thus you will find people doing the filling who have never seen them filled and have no inkling of what needs to be done. I hauled my doubles into a shop in Colorado, and the person who did the filling was very up front about that. "Tell me what to do," he said.
    Ryan Mcshane likes this.
  4. sea_otter

    sea_otter DIR Practitioner

    # of Dives: 200 - 499
    Location: San Jose, CA
    I've had two fail on me in the past year. In both cases, I noticed this pre-dive, but it does happen.

    Regardless of failure, I never want to be surprised by what the number on my SPG says. I also don't particularly want to have to look at it every two minutes.

    Some simple mental math (I'll use expected 5-min gas consumption by average depth in backmount, and time to breathe 200 psi from one tank in sidemount) helps make life easier and dives more comfortable.
    dave22387 likes this.
  5. dave22387

    dave22387 ScubaBoard Supporter ScubaBoard Supporter

    # of Dives: 1,000 - 2,499
    Location: Coconut Creek, FL
  6. Fastmarc

    Fastmarc Just drifting along... ScubaBoard Supporter

    # of Dives: 200 - 499
    Location: Kingston, Jamaica
    Thanks to the OP and those that answered. This was an informative thread.

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