Mailing List Archive Mailing List Archive
Doug, I want to look at a couple of things you cited here and clarify them from our experience, but first let me point out that even using helium in the drysuit does not cause anything but getting cold. We have had people do this and while they regretted it severely, they suffered only the cold. you said:We have already alluded to this possibility when it became understood that gas bubbles in the circulation system have an effect on the body's efficiency on off-gasing thereby further indicating the classical exponential ongas-exponential offgas computations to be over-simplified. Suffice to say OUR EXPERIENCE on this : offgassing in bubble form at the shallower steps works quite well. Deep it is too risky as to bubbling in the tissues rather than into the bloodstream. The lungs are quite effective as a filter providing you have no pulmonary shunt or pfo. I use this technique to vastly accelerate deco. you said: is based on the total sum of all the inert gas partial pressures of the constituent inert gases. Appling this theory which inherently embodies the counter-diffusion principle he was able to demonstrate that decompression times can be shortened by switching to inert gases of greater molecular weight OUR EXPERIENCE : the oxygen window determines this - the correct way to say "sum of the inert gases", and it makes no difference what the inerts are. you said:However after about 2 o 3 hrs duration a He-O2 dive would result in shorter decompression time. This may be explained by counter-diffusion as during the longer duration dives the N2 inert gas tensions in the tissues would be somewhat OUR EXPERIENCE : all decoes are shorter if helium is the gas - bullman was full of shit on this . The damage from nitrogen precludes getting a successful deco of any kind. It is air tables that need be long, not helium. you said: Human experiments have indicated that itching of the skin and vestibular effects (middle-inner ear diffusion) may occur as a result of isobaric inert gas counter-diffusion under similar parameters as the animal testing. Again this form of superficial isobaric inert OUR EXPERIENCE : this type of hit is due to poor circulation, insults due to smoking or other bullshit habits, fat slobbery, and or having a cold, allergies, etc. It is bullshit , not counterdiffusion. you said: > According to conventional theory, there is the possibility of a "deep > tissue" problem resulting by breathing a high-helium content gas following > a prolonged exposure to a N2-O2 mixture. For example at 200ftsw constant > ambient pressure with tissues saturated, or near-saturated, with N2, a 50ft > supersaturation gradient will be achieved after about OUR EXPERIENCE - no shit, the problem is called "deep air diving". We do not do it since from 200 feet on air you are no decompressing, you are killing yourself cell by cell. -- Send mail for the `techdiver' mailing list to `techdiver@aquanaut.com'. Send subscribe/unsubscribe requests to `techdiver-request@aquanaut.com'.
Navigate by Author:
[Previous]
[Next]
[Author Search Index]
Navigate by Subject:
[Previous]
[Next]
[Subject Search Index]
[Send Reply] [Send Message with New Topic]
[Search Selection] [Mailing List Home] [Home]