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Most thing I've ever noticed in a rebreather is the taste. Slight, but you know where it's been. At 09:44 PM 12/9/94 +1100, Jason Rogers wrote: >Hi everyone, >Two things, > >Anthony Appleyard wrote; >***quote*** >In rebreathers, how dry does the absorbent make the breathed gas? On a long >dive does that often cause worse mouth dryness than is usual with aqualungs? >***end quote*** > >My understanding of CO2 absorbers is that they need some moisture to work >and so the loop should remain moist, particularly as you are rebreathing >your moist exhaled gas. I haven't done enough time on a rebreather to >say from experience though (damn it). I think the normal moisture is >about 10% but this is from memory, often hazy these days. > >Subject 2, > >Steve Hogan wrote >***quote*** >...but if I felt symptoms coming on and the chamber is more than >1-2 hours away (depending on my condition) I would *probably* opt for >IWR also. >***end quote*** > >Kevin-Neil Klop wrote, >***quote*** >...the coast guard could get to you in 1/2 an hour (because >they have a base nearby), but that it will be 1 + 1/2 hours before you can >enter a chamber (because the nearest available chamber is 1 + 1/4 hours >flight time and it takes 1/4 hour from landing to entry into chamber). >Should you have the helicopter standby (or not call them) and attempt IWR >instead? > >I have a gut instinct that says "no". > >***end quote*** > >Kevin's maths is a bit wonky here, he metions the 1/2 hour for the chopper >reach the diver, but then it disappears from the calculation again. Small >point, it is a hypothetical (is that how you spell it) situation anyway. > >The point I want to make is that a Hyperbaric unit in Australia has advised >me that the absolute minimum time required to assess a patient *before* they >can be placed in a recompression chamber is *One Hour*. If you feel as >Steve does that a 1 or 2 hour delay would swing you toward IWR then you >may need to factor that in. If you are in a situation like Kevin, 1/2 hour >to call a chopper (this is quite short, it takes a while to preflight them) >plus 1+1/4 hour flight time (1+3/4 hours) plus 15 minutes to load the diver >(2 hours) plus a 1 hour delay at the hospital you are faced with a >minimum 3 hour delay. That minimum of one hour, advised by the hospital, >was if you called ahead, and the staff could be found to man (person?) the >chamber. If not then they would need to come in from home, and set up the >chamber from scratch. > >If you *know* of facilities that can recompress in a significantly shorter >time, please contact me, as I would like to pass this information on to >the management of the chamber in question. > >Cheers Jason (Southern Hemisphere branch) ;) > > >-- >Send mail for the `techdiver' mailing list to `techdiver@opal.com'. >Send subscription/archive requests to `techdiver-request@opal.com'. > > ------------------------------------------------------------- Scot Anderson email: scot@bt*.co* URL: http://www.btg.com/~scot/ Vienna, Virginia. USA Voice: 703.761.6536 Fax: 703.761.6555
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