Trimix

[Duzzzz]

Hey,

Could someone help (check my answer) me with calculating my trimix mix. I am so bad with these. My answer was 14/47 but I am not sure if it is correct.

I use these values:

depth 90m
1 ATM / 10m
p.p. O2 1,4
narc O2 = narc N2
narc H2 = 0,24
END 40m

 

[tursiops]

I get 13/48 or 14/47 depending on model assumptions.

 

[vincent54]

If you are doing sample problems, you can check your answers with this calculator.
Trimix Calculator - Best Mix - The Scuba Doctor
It calculates your answer to be 14/47 and only 214.10 dollars for the fill.

 

[rivers]

Hey,

Could someone help (check my answer) me with calculating my trimix mix. I am so bad with these. My answer was 14/47 but I am not sure if it is correct.

I use these values:

depth 90m
1 ATM / 10m
p.p. O2 1,4
narc O2 = narc N2
narc H2 = 0,24
END 40m

I just plugged it into multi-deco. You did your maths correctly

 

[Storker]

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A ScubaBoard Staff Message...

A number of off topic posts have been removed. The OP asked a straightforward question, let's keep the answers straightforward.

Further bickering or off topic speculations will be met with harder sanctions.


Thread moved to Technical Diving Specialties which is a more appropriate forum for discussing a 90m dive on hypoxic trimix

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[boulderjohn]

I assume you are a trimix student working your way through the academic portion of the course materials. Make sure to talk to your instructor about this issue. He or she might have a lot to say about the concept of best mix in addition to what those materials say--I know I would.

 

[stuartv]

I asked a question about how tursiops got the 13/48 solution. I would really like to know. The problem of 10ATM and ppO2=1.4 seems like the answer would always have FO2 of 14%. But, I have no training in trimix or calculations for a depth of 90m. I'm trying to learn here.

Why did that get deleted?

 

[KevinNM]

Indeed, 1.4 is a pretty high pO2 level for the actual dive. I was given a limit of 1.2 for tech dives working phase. But then we also use a max END of 30m.

 

[boulderjohn]

Indeed, 1.4 is a pretty high pO2 level for the actual dive. I was given a limit of 1.2 for tech dives working phase. But then we also use a max END of 30m.

I have trimix training through 3 different agencies, and all 3 had different teachings on this topic. In fact, in one agency I was taught one thing in the normoxic trimix class and another in the hypoxic trimix class. The answer your instructor will want for a question of what to dive at what depth will vary by agency and instructor. What you will actually dive under those circumstances can be a very different thing altogether.

 

[stuartv]

Indeed, 1.4 is a pretty high pO2 level for the actual dive.

I wasn't attempting to question that. I understood the OP to be calculating a mix based on given dive parameters that include a depth of 90m and a target max ppO2 of 1.4.

In that case, I would like to understand what model or assumptions tursiops is talking about that result in having an option for a calculated mix that has FO2 of 13%. As I said, I don't have training yet in trimix or special calculations for diving as deep as 90m. From what I know so far, I would have expected the answer on the mix to always have FO2 of 14% and the FN2 and FHe to be what is really being calculated.

Like I said, I'm just trying to learn more. Even just a keyword or two to search on or a link to something I can read would be appreciated.