TDI Advance Nitrox, what do you learn?

[crestgel]

I just finished my TDI Nitrox class. I now understand more about Nitrox and have a question in my mind. What do you learn in Advance Nitrox. I read that you learn to dive using Nitrox up to EAN100 but what are the benefits? I’m guessing that you learn how to dive pass the PO2 of 1.6

Can someone shed light on this? If there is a PDF of the TDI Advance manual online Let me know.

 

[jagfish]

I'm intersted in the class as well,
but I'd be surprised if you dive past that PO2...Hard to change biology.

Higher percentages of O2 would be used at shallower depths.

My Nitrox class was PADI and a while back, so I don't remember exactly, but isn't the max depth for pure oxygen something like 17 feet?

JAG

 

[crestgel]

My same thought.

I'm intersted in the class as well,
but I'd be surprised if you dive past that PO2...Hard to change biology.

Higher percentages of O2 would be used at shallower depths.

My Nitrox class was PADI and a while back, so I don't remember exactly, but isn't the max depth for pure oxygen something like 17 feet?

JAG

 

[H2Andy]

not sure about the TDI class, but i understand that the PADI Advanced Nitrox takes you to 50% O2 at deco, with a max. deco time of 10 minutes (blame the instructor who told me that
if this is wrong)

as you guys noted, raising the O2 % will severely limit the depth at which you can use the gas.

btw, the MOD of 100% O2 is 20 feet (1.6 atm)

 

[GoBlue!]

My Nitrox class was PADI and a while back, so I don't remember exactly, but isn't the max depth for pure oxygen something like 17 feet?

JAG

I haven't taken a Nitrox course yet, but it seems that if the absolute max ppO2 tolerable is 1.6 and you're breathing an FiO2 of 1.0 (100%), you shouldn't be below 1.6 ATA, or 19.8 ft for very long.

This'll be a simple question for tons of people to answer...perhaps I should've just waited instead of going out on a limb.

Jim

 

[H2Andy]

GoBlue:

well... the trouble is that O2 tolerance is not so much a "line" as a "zone." some people can tolerate more O2 some days, and get zapped with less on a different day. some people get zapped with the exact same mixture doing the exact same dive as their buddy, who is not affected...

generally speaking, recreational agencies limit the exposure to 1.4 maximum and 1.6 contingency (not exactly clear what this means). most decompression gasses are planned at 1.6.

others (I think NOAA, for example) have the limits at 1.6 and 1.8 respectively.

 

[mempilot]

TDI Advanced Nitrox travels into more depth on the physiological effects of higher fractions of O2. ie FO2 > 40. As for PO2, 1.6 PO2 is the maximum. You spend more time using the equations to calculate Best Mix, MOD, EAD, CNS%, and OTU's. Much of the book is a repeat of the TDI Basic Nitrox book.

This class is usually taught in conjuction with TDI's Decompression Procedures class. The most common use of FO2 > 40 is in decompression. The typical class when combined lasts about 6-8 hours, and you complete several dives focussed on equipment considerations, planning, procedures, and implementation.

For the combined class, equipment considerations include O2 clean regs, manifolds, spg's, tanks, etc... Planning includes using back gas bottom time, decompression stops, and gas switches. Procedures include gas analysis, gas management, contingency planning, emergency procedures, lift bag deployment, etc...

TDI's and IANTD's courses are very similar. I'm not sure about PADI's course.

The Adv. Nitrox has real benefit to decompression diving. It is also worth taking as a Nitrox refresher after you have dived Nitrox for a while. Your understanding will be at a much higher level than you left the Basic class with.

This isn't a completely detailed answer, but I hope it helps.

 

[jbd]

GoBlue:

well... the trouble is that O2 tolerance is not so much a "line" as a "zone." some people can tolerate more O2 some days, and get zapped with less on a different day. some people get zapped with the exact same mixture doing the exact same dive as their buddy, who is not affected...

generally speaking, recreational agencies limit the exposure to 1.4 maximum and 1.6 contingency (not exactly clear what this means). most decompression gasses are planned at 1.6.

others (I think NOAA, for example) have the limits at 1.6 and 1.8 respectively.

Most recreational agencies use the 1.4 for the "working" part of the dive. During deco when you are mostly resting, 1.6 may be allowed. 1.6 for contingency purposes is for handling emergencies or problems that may arise.

 

[GoBlue!]

Most recreational agencies use the 1.4 for the "working" part of the dive. During deco when you are mostly resting, 1.6 may be allowed. 1.6 for contingency purposes is for handling emergencies or problems that may arise.

I wasn't really meaning to focus on the pO2 max. I was more curious about the depth of safe use of 100% FiO2. If we go with 1.4 max, I think the max depth would be 13.2 fsw. So, my point was that it seems 100% oxygen shouldn't be used for prolonged periods of time below 13-20 ft. Is this correct?

Jim

 

[mempilot]

I wasn't really meaning to focus on the pO2 max. I was more curious about the depth of safe use of 100% FiO2. If we go with 1.4 max, I think the max depth would be 13.2 fsw. So, my point was that it seems 100% oxygen shouldn't be used for prolonged periods of time below 13-20 ft. Is this correct?

Jim

100% O2 is a decompression gas normally used at 20' or less. You would never use it for back gas. I'm assuming that is what you are planning?