Gas Matching

[Capt Jim Wyatt]

Someone asked about gas matching on another thread. I use a Powerpoint to teach it -- I saved it as a .PDF and posted it below.

 

[jstrang]

Someone asked about gas matching on another thread. I use a Powerpoint to teach it -- I saved it as a .PDF and posted it below.

Nice article but it is wrong.

The turn volume for the diver with the 85s is not 153 cuff. That is how much they have to reserve. They can only use 77 cu ft.

so the other diver can only use 77 cu ft of their 280 - or ~1000psi. they will turn the dive when they reach 2600psi. The diver with the 85s will turn the dive at 2400psi.

john

 

[Capt Jim Wyatt]

Nice article but it is wrong.

You are right, it was wrong and I have deleted the file...I will upload it again here. Thank you for catching it. I think this revised one is correct -- I apologize for being a jackass.

 

[Manatee Diver]

I see the error, instead of taking a third of 1,200 and multiplying it against the tank factor you are taking the turn pressure and multiplying it against the tank factor.

The math is all right, just the wrong pressure was used to calculate that.