Nitrox

[MikeFerrara]

Yep, Bubble Junky is right....found the reference to it:

PADI Enriched Air Diver Manual, pp. 75-76

" Although these NOAA limits don't specify minimum surface intervals, and there's no measurable surface interval credit, it's recommended that you allow a surface interval of at least an hour between enriched air dives, whenever possible, especially if you exceed more than 50% of allowable exposure. This is believed to further reduce the likelihood of oxygen toxicity."

It should be pointed out that, while it isn't usually taught in recreational nitrox courses, that a "surface interval credit" can be applied to %CNS exposure. In fact, most dive computers do so. Most commonly a 90 minute half time is used. Also, some O2 exposure charts include it and, of course, you can calculate it yourself.

 

[Digger54]

Wrong. You should not pass on Bogus info

In the PADI "Enriched Air Diving" specialty manual, copyright 2005, Page 75, paragraph four, subtitled "Follow these guidlines when using the Oxygen exposure Table" Item 5 says, "Although these NOAA limits don't specify minimum surface intervals, and there's no measurable surface interval credit, it's recommended that you allow a surface interval of at least an hour between enriched air dives, whenever possible, expecially if you exceed more than 50% of allowable exposure. This is believed to further reduce the likelihood of oxygen toxicity."

Yes, it is a RECOMMENDATION, not a rule. But bogus....hardly.

You know, I'd rather be responsible for a person taking an unnecessarily long surface interval due to my (and PADI's) "bogus" information and live than to have them dive to soon and die of CNS toxicity.

(I think a guy named Boguskie may have written this section of the book, however.)

 

[diverdowndh]

I asked this same question when I finished my nitrox class... I don't own an analyzer and have used nitrox on about 4 trips now. they have one at the shops and have you sign off on it like letsgodiving said.