multiday OTU's

[oldguy]

Any good consensus available on multi-day nitrox dives and oxtox? Depth, time, multiple dives, partial pressures, etc? Chart, table, etc. Mainly interested in single gas nitrox use. Thanks for all responses. Safe diving.

[mgersch]

I think your location says it all. (my opinion)

As you know from you nitrox course, there are simple tables available that give all this info. Each of the training agencies that offers a nitrox class has a table.

But the more, repetitive dives we do, and the more repetitive days, and the more deco we do, I think, it all begins to fall apart. (my opinion).

[Line Squirrel]

But the more, repetitive dives we do, and the more repetitive days, and the more deco we do, I think, it all begins to fall apart. (my opinion).

FWIW I think you're right, not an exact science. Way too many variables.

I'm a "one dive per day" guy but still I quit diving to 1.4ppo during the working portion a couple years ago. I try to keep it at 1.2ppo or lower.

[Mike Edmonston]

Any good consensus available on multi-day nitrox dives and oxtox? Depth, time, multiple dives, partial pressures, etc? Chart, table, etc. Mainly interested in single gas nitrox use. Thanks for all responses. Safe diving.

Something I like to do, is to reduce my daily oxygen limit by 10% for every consecutive day that I dive.

For example, if I dive on monday, and i have a clean o2 clock, then my full OTU count is available (minus the reserves for an inadvertent trip to the chamber). If I have less then 48 hours between dives (Thursday), then I reduce my allowable o2 clock by 10% for the next day (Tuesday, Wednesday etc...), and so on. I have also decided to use a running PPo2 of 1.2 instead of 1.4 during my dives.

Again, this is just what I like to do. YMMV.

Safe diving..

[contender]

Something I like to do, is to reduce my daily oxygen limit by 10% for every consecutive day that I dive.

For example, if I dive on monday, and i have a clean o2 clock, then my full OTU count is available (minus the reserves for an inadvertent trip to the chamber). If I have less then 48 hours between dives (Thursday), then I reduce my allowable o2 clock by 10% for the next day (Tuesday, Wednesday etc...), and so on. I have also decided to use a running PPo2 of 1.2 instead of 1.4 during my dives.

Again, this is just what I like to do. YMMV.

Safe diving..

I believe that the OTU's table is based on exactly half of what you can really have for that inadvertent trip to the chamber. So not sure that you need to add in a reserve for that trip. I read this in the NAUI tech EANx & deco book by Jan Neal, if you are interested in it.

Chad

[Line Squirrel]

I believe that the OTU's table is based on exactly half of what you can really have for that inadvertent trip to the chamber.
Chad

Chad - That is how I was trained as well, the OTU limits were/are based on the need for a possible trip to the chamber.

However, with a couple of unexplained deaths that are suspected oxtox, even though their gas analyzed within acceptable ppo2 limits, many of us are opting to be a little more conservative.

[contender]

Chad - That is how I was trained as well, the OTU limits were/are based on the need for a possible trip to the chamber.

However, with a couple of unexplained deaths that are suspected oxtox, even though their gas analyzed within acceptable ppo2 limits, many of us are opting to be a little more conservative.

I completely agree with being more conservative, I have lowered my ppo2 limits as well in light of recent events.

[Mike Edmonston]

I believe that the OTU's table is based on exactly half of what you can really have for that inadvertent trip to the chamber. So not sure that you need to add in a reserve for that trip. I read this in the NAUI tech EANx & deco book by Jan Neal, if you are interested in it.

Chad

Hi Chad,

That's exactly what I was referring to. I do not cut my OTU in 1/4's. Sorry I wasn't more specific. I have dove with some, that did not "reserve" any clock for a possible chamber trip, that is why I mentioned it.

BTW, that is a good book, I might have read it once or twice

Safe diving,

[Mike Edmonston]

Hey Mike,

Nice grooping on your Avatar. .223 at 100 Meters?

[Line Squirrel]

Hey Mike,

Nice grooping on your Avatar. .223 at 100 Meters?

Great guess!! 22-250 at 100yds, which is pretty much the same thing <G>