why hasnt nitrox replaced compressed air completely?

[beanojones]

DAN has the outcome of the 2002 workshop on their site:

Alert Diver | Flying After Diving

And the full pdf of the proceedings:

https://www.diversalertnetwork.org/files/FADWkshpBook_web.pdf

Interestingly, before that it was 12 hourse for a single no stop dive, substantially more than 18 hourse for a deco dive, and nothing specific for multiple dives of multiple days.

Every instructor I know who got bent got bent after waiting 24 hours after a week's worth of diving at Truk/Chuuk, (or was guiding without a computer, and instead fudging tables.)

VVV (Apparently I did, but to be fair, so did eveyone else.) VVV

 

[Lorenzoid]

beano, did you overlook posts #84, 86, 89, etc., with a link to those same guidelines?

 

[AfterDark]

All this depends on where you are diving. I've had the experience of having a mix for the planned dives only to have the weather cause the capt. to have to go to a spot where it exceeded my MOD. There were tanks on board they let me use but it brought home why I like 21% so much.

 

[Madacub]

Reading all of this has left me feeling quite fatigued.........

........maybe I should have strapped on my nitrox...........?

But seriously, I understand that the theoretical link is not clear, and that this has not been backed up by proper studies, but I do notice that I often feel less fatigued after 3-4 dives a day on nitrox, against compared to air. In an unfamiliar vacation location, I might ask the dive guide, and generally dive the first 1-2 dives on air, before deciding whether it is worth the extra money for nitrox.

 

[Lost down under]

I've always though about running a placebo on on a group of divers over say 4 consecutive, fairly shallow dives, well within the remit of using air and provide tanks plastered in nitrox stickers filled with air.

I'll get us started on the next "wing or jacket set up" thread, although I haven't read much on split fins recently and am worried the owners might have got themselves into some terrible strife!

 

[EFX]

I've always though about running a placebo on on a group of divers over say 4 consecutive, fairly shallow dives, well within the remit of using air and provide tanks plastered in nitrox stickers filled with air.

Make sure you only use oxygen-ready tanks for your air fills. Don't put nitrox stickers on air only tanks. If a diver takes it to the shop for filling, the shop might assume the diver wants nitrox. This could create an exposion hazard. But you probably knew this already so it's a friendly reminder.

 

[redacted]

Make sure you only use oxygen-ready tanks for your air fills. Don't put nitrox stickers on air only tanks. If a diver takes it to the shop for filling, the shop might assume the diver wants nitrox. This could create an exposion hazard. But you probably knew this already so it's a friendly reminder.

Friendly, but incorrect. "Oxygen-ready" (O2 clean) is only required for partial pressure blending of recreational nitrox.

 

[boulderjohn]

Interesting.

That is not on the DAN web site--it is on the Scuba Diving magazine web site. It does not identify the speaker, so when it says "We," the identity of "We" is unknown. It could be someone from the magazine saying it and then summarizing the DAN position. The title "Ask DAN" implies that the writer is within the DAN organization, but it does not clearly state that. It would be interesting that a DAN representative would say something different from what is found on the DAN site itself.

I would like to see something that clearly comes from DAN.

---------- Post added July 11th, 2014 at 12:29 PM ----------

I just wrote to DAN for a clarification.

OK, I just got an official word from DAN. Apparently whoever wrote about the 24 hour recommendation was either speaking on behalf of the magazine, not DAN, or was making a mistake. Here is the full text of the message I received from DAN:

John,
Thank you for your e-mail. We are truly sorry for the confusion. Below are the recommended guidelines that were established in May 2002. This should clarify any misunderstanding. If we can be any further assistance do not hesitate to contact DAN.



Revised Flying After Diving Guidelines for Recreational Diving - May 2002

The following guidelines are the consensus of attendees at the 2002 Flying After Diving Workshop. They apply to air dives followed by flights at cabin altitudes of 2,000 to 8,000 feet (610 to 2,438 meters) for divers who do not have symptoms of decompression sickness (DCS). The recommended preflight surface intervals do not guarantee avoidance of DCS. Longer surface intervals will reduce DCS risk further.



•For a single no-decompression dive, a minimum preflight surface interval of 12 hours is suggested.


•For multiple dives per day or multiple days of diving, a minimum preflight surface interval of 18 hours is suggested.


•For dives requiring decompression stops, there is little evidence on which to base a recommendation and a preflight surface interval substantially longer than 18 hours appears prudent.

Divers Alert Network

Marty McCafferty EMT-P, DMT, EMD-A
DAN, Medical Information Specialist

 

[Hawkwood]

Maybe DAN should have a look at those old articles:

"....Here at DAN, we've made the relationship between altitude and diving one of our primary studies for many years, and if we do say so ourselves, we're experts on the subject, regularly helping to analyze and update the flying-after-diving rules taught by training agencies worldwide. Here are answers — using the most scientifically up-to-date information our researchers can provide — to the three most common altitude and diving questions we're asked on our emergency hotline and medical information lines....."

 

[ciardi23]

I fill my own air - don't have access or training in Nitrox - don't need it... All my diving needs - owning my own equipment and being able to fill my own air makes it cheaper...

How are you filling your own air? And what locations do you dive at near Basking Ridge? I am also from New Jersey but I'm a ways south from you.