Nitrox when others are on air

[BRT]

You should try to find a shop that can do partial pressure for these dives.

Or just continue doing what he is successfully doing. Unless you can find a case of an open circuit diver toxing at 1.6.

 

[L13]

Or just continue doing what he is successfully doing. Unless you can find a case of an open circuit diver toxing at 1.6.

Would it be enough to point out that the majority of OC deaths are drowning? Usually we have no idea why, could it be Ox Tox? Maybe?

I disagree with @BlueTrin that you need to find another mix for these dives, but he is right that using 32% has some risk.

 

[BRT]

Would it be enough to point out that the majority of OC deaths are drowning? Usually we have no idea why, could it be Ox Tox? Maybe?

I disagree with @BlueTrin that you need to find another mix for these dives, but he is right that using 32% has some risk.

Could be Oxtox. If the victims were diving deep enough to reach a PPO2 of over 1.4. And didn't have buddies to tell what happened. Or do you think some may be toxing below 1.4?

 

[BlueTrin]

Would it be enough to point out that the majority of OC deaths are drowning? Usually we have no idea why, could it be Ox Tox? Maybe?

I disagree with @BlueTrin that you need to find another mix for these dives, but he is right that using 32% has some risk.

Just for info, not doing partial pressure fills is rare in the UK.

Literally I know only a few shops that banks 32% and these shops will do partial pressure if you ask. All the shops I know do any mix you want, 28%, 30%.

The vast majority of U.K. divers will just ask the mix to have 1.4 on bottom. This is why I am saying this. If he has no other shop in his vicinity, then I guess it makes sense.

 

[L13]

Could be Oxtox. If the victims were diving deep enough to reach a PPO2 of over 1.4. And didn't have buddies to tell what happened. Or do you think some may be toxing below 1.4?

Look at the chart @BlueTrin 's post #53.

The lowest line is 2% risk. The difference between the 5% line and the 2% line is greater than the difference between the 8% line and the 5% line, so it appears that as we reduce risk it takes even more to further reduce risk.

Given that severe consequences of seizures while at depths where PO2 would be high, I think 2% is way to high to be acceptable when not in a chamber with attendants. I plan to do 1000s of dives in my life. I would like to never have a seizure. How far do you think the line in that chart drops to get the risk well below 0.1% per dive?

 

[shoredivr]

I live in the UK, diving here isn't really a thing, so my diving for the foreseeable future is as part of a holiday. In that context, I'm showing up to a dive centre and joining their boat for 2-3 days while I'm the area and that's it. I don't know anyone I'll dive with.

I had assumed this is how most people dived most of the time?

In any case better surface intervals are also pointless if I'm stuck waiting for a group, and I'm only diving twice a day on their boat so increased safety over the day is also not a concern. I mainly got the Nitrox certification to be able to enjoy dives at 30 meters for longer, and now wondering if that's ever actually going to happen

Bruh, there is LOTS of local diving in the UK! Check out a dive shop or club. You’ll want to get a drysuit and get drysuit certified, but you are missing out on lots of local diving goodness!

 

[BRT]

Look at the chart @BlueTrin 's post #53.

The lowest line is 2% risk. The difference between the 5% line and the 2% line is greater than the difference between the 8% line and the 5% line, so it appears that as we reduce risk it takes even more to further reduce risk.

Given that severe consequences of seizures while at depths where PO2 would be high, I think 2% is way to high to be acceptable when not in a chamber with attendants. I plan to do 1000s of dives in my life. I would like to never have a seizure. How far do you think the line in that chart drops to get the risk well below 0.1% per dive?

And yet you cannot find a single confirmed open circuit oxtox at 1.6.

 

[BlueTrin]

.

 

[Alekseolsen]

Just cause I'm an ass:

IANDT uses 1.5 bar PPO2 for working g portion in their recreational trimix class, so I guess YMMV


2. The Program employs EANx mixes from 21% to a maximum of 50% oxygen. It also allows use of helium based mixtures for dives
deeper than 80 fsw (24 msw) that provide a PO2 no greater than 1.5 at the TOD with a Helium content that maintains an END no
greater than 80 fsw (24 msw).

https://www.google.com/url?sa=t&source=web&rct=j&opi=89978449&url=https://www.iantd.no/Instr/ResourceArchive/upload/files/IANTD%2520Standards%25202005%2520red.pdf&ved=2ahUKEwijlJyq_PWAAxUrT6QEHYePBQQQFnoECCkQAQ&usg=AOvVaw2wJzK-X8GvX-NbgKEVF3Ir

 

[OctopusLover]

Look at the chart @BlueTrin 's post #53.

The lowest line is 2% risk. The difference between the 5% line and the 2% line is greater than the difference between the 8% line and the 5% line, so it appears that as we reduce risk it takes even more to further reduce risk.

Given that severe consequences of seizures while at depths where PO2 would be high, I think 2% is way to high to be acceptable when not in a chamber with attendants. I plan to do 1000s of dives in my life. I would like to never have a seizure. How far do you think the line in that chart drops to get the risk well below 0.1% per dive?

Personally I think even 0.1% is too high, yet I feel reasonable sure the actual risk of what I did here is below that threshold. This chart is saying a 1 minute exposure has a 2% chance of symptoms at PPO2 2.5, that's almost twice the pressure I was at. Hell, the first convulsion in this chart is after almost an hour at 1.75?

Of course there is still some risk, I'm sure even 1.4 has some theoretical risk, but as a general rule I'm happy to take risks that are clearly below the threshold where the first recorded accidents are on a well studied topic. This discussion is reminiscing of arguments I've had countless times about taking recreational drugs, I'm happy to do it but only light/moderate doses, after doing extensive research and using test kits on anything I take. Most people either don't take drugs dogmatically or take whatever they are sold at a rave, I agree with neither side and don't expect to get their blessing