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  1. Thread: Diving Sums

    by matt
    Replies
    18
    Views
    21,400

    MadUKDiver added this to his spreadsheet a few...

    MadUKDiver added this to his spreadsheet a few years back, here's that thread with some other useful stuff too: https://www.thediveforum.com/showthread.php?14935-Yet-Another-Gas-Mix-Calculator-
    ...
  2. Thread: Diving Sums

    by matt
    Replies
    18
    Views
    21,400

    Added back all the pictures that were broken...

    Added back all the pictures that were broken since the postimage changed all the URLs (which were made after PhotoBucket became a PITA).
    If you see a mistake do let me know.
    Matt.
  3. Thread: Diving Sums

    by matt
    Replies
    18
    Views
    21,400

    For completeness, Minimum Operating Depth: ...

    For completeness, Minimum Operating Depth:

    https://i.postimg.cc/mDpVPpCH/MinOD.png
  4. Thread: Diving Sums

    by matt
    Replies
    18
    Views
    21,400

    OK, RTFQ, lol.

    OK, RTFQ, lol.
  5. Thread: Diving Sums

    by matt
    Replies
    18
    Views
    21,400

    I know it's a bit boring MC... ...

    I know it's a bit boring MC...

    https://i.postimg.cc/qRDkRKw7/MOD.png

    He’s an example:



    https://i.postimg.cc/631JB0QH/MODExample.png
  6. Thread: Diving Sums

    by matt
    Replies
    18
    Views
    21,400

    Trust BJ to make a sarky post right in the middle...

    Trust BJ to make a sarky post right in the middle of things, lol.

    HNY John.

    Matt.
  7. Thread: Diving Sums

    by matt
    Replies
    18
    Views
    21,400

    Cylinder Filling for Trimix Assuming you only...

    Cylinder Filling for Trimix

    Assuming you only have Oxygen, Helium and Air available to you for cylinder filling then how do you go about working out what to put into the cylinder? First you can...
  8. Thread: Diving Sums

    by matt
    Replies
    18
    Views
    21,400

    What gas am I breathing? With OC the gas you...

    What gas am I breathing?

    With OC the gas you are breathing (the fractions) stay the same. Not true with CCR, the PO2 is constant and the FO2 is variable. The inert gasses Helium and Nitrogen...
  9. Thread: Diving Sums

    by matt
    Replies
    18
    Views
    21,400

    Gas Density This part is really only for...

    Gas Density

    This part is really only for interest. It shows how to figure out the density of a gas at any depth and then how to compare that to Air to get the Equivalent Air Density.

    Gas...
  10. Thread: Diving Sums

    by matt
    Replies
    18
    Views
    21,400

    A word on Isobaric Counter Diffusion (ICD) ...

    A word on Isobaric Counter Diffusion (ICD)


    Actually, only a word on the calculation whether you subscribe to the theory is up to you.


    ICD simply checks the PN2 change following a gas...
  11. Thread: Diving Sums

    by matt
    Replies
    18
    Views
    21,400

    Gas Selection One of the first things to do is...

    Gas Selection

    One of the first things to do is to work out what gas we will take on our dive – both for OC bailout and for diluent. Ideally we will create a new mix for every dive using the Ideal...
  12. Thread: Diving Sums

    by matt
    Replies
    18
    Views
    21,400

    Diving Sums

    Diving Sums

    Nowadays calculations are done by computers, laptops & phones. I know when I did my course the sums behind technical diving (both OC and CCR) was broadly glossed over. For example when...
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