gas matching

[lermontov]

Im helping a buddy who is writing a wreck diving manual and looking for some sort of pictorial example of the best way to show how gas matching works rather than just looking at calculations.
any body got anything they are willing to share?

 

[Capt Jim Wyatt]

If you come up with something pictorially I'd like to see it too.

The only way I know to do it is through calculations.

http://www.cavediveflorida.com/Gas Matching.pdf

 

[wstorms]

Maybe something like this where you illustrate equal amounts of gas in different size / pressure cylinders? You still would need to include the math, but might help get the point across?

 

[NAM001]

the term has caught me off guard. what is gas matching?

 

[lermontov]

@KWS calculating turn pressures etc using unequal pressures or volumes of gas between divers to ensure adequate reserves are met- in particular cave diving

 

[lermontov]

Maybe something like this where you illustrate equal amounts of gas in different size / pressure cylinders? You still would need to include the math, but might help get the point across?

yes going down that track ill pm you

 

[tomcatbubba]

Something like this? I just made it, so excuse any typos.

 

[lermontov]

Something like this? I just made it, so excuse any typos.

Great stuff ive done a similar style showing emptying bottles

 

[tomcatbubba]

Great stuff ive done a similar style showing emptying bottles

Wow that is nice, much better than mine. Nice work! It's funny, I was teaching a class yesterday on U-352 (best weather I've ever seen, "Lake Atlantic" + 80+ foot vis). We both dove LP85 twinsets. MUCH easier to do gas matching calculations LOL.......

 

[tmassey]

Great stuff ive done a similar style showing emptying bottles

One key difference between yours and the previous one is: in the dissimilar tanks and the dissimilar pressures, you show the blocks as being the same size. Yeah, I know the numbers are different. But it seems to me it would benefit from making the blocks different size.

In the case of dissimilar pressures, there could be some white space at the top, symbolizing the “partially filled” lower pressure. In the case of dissimilar tanks, one tank could be longer (or maybe better, wider: the difference between 85 and 104s) than the other, and the blocks would therefore be a different size. That makes it much easier to see that this block does not cover that block.

Do with that thought what you will.