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Steve, It has been common for me, and more than half of the people who I dive with, to do repets on trimix, even on up to three consecutive days. I have been diving mix in the New York area since 1992 at depths ranging from 200fsw to 290fsw, with surface intervals ranging from 2 to 6 or more hours (although we almost always prefer at least three hours). I do not take repets casually and I am always more conservative on repets from a table standpoint. I have never taken a chamber ride, or seen anyone else take one specifically related to making a repet. In 1994 I dove the Lusitania with the Tapson mob and they were vehemently opposed to repet diving on trimix, however, they were comfortable with oxygen at pressures higher than 3000 psi (up to 4500 psi), while I and the other Americans were not. It is my opinion that these are two examples of differences in cultural perspectives. If you want to do it, and you can figure out how to do it, then do it. Best of luck, mate. JC > This question may attract a whole load of 'flames', but here goes.... > > > We have a group of experienced divers in the North West of England, all >with between 500 & 1000 dives each, who are currently diving some wrecks on the >North-East coast in the depth range of 55m to 65m. A typical target depth would >be 63m. Dives are done using air as a bottom mix and using either 50% or 80% >Nitrox as a deco gas. All dives are done using an air computer & treating the >Nitrox as though it was air, to give an extra safety margin. A total deco time >of between 30 mins up to 1 hour is normal for each dive. > > At present, divers are doing one 60m+ dive in the morning and following >a 6 hour surface interval, are doing the same 60m+ dive in the afternoon. Not >everyone is doing this but so far no one in our group has ended up in a chamber. > One pair of divers on the last trip stacked over 5 hours of deco in 5 dives >over a 3 day period. There were no symptoms of decompression illness. > > We are now moving over to Trimix diving because the nitrogen narcosis at >60m+ is unacceptable. So far, 5 divers are IANTD certified, with another 2 to >follow shortly. Current wisdom suggests that we should only be doing 1 Trimix >dive a day (which is what I will be doing). However, 'current wisdom' does not >advocate two 60m+ air dives in one day either. > > So.....the $64,000 question...is there anyone out there with experience >with mutliple Trimix dives in a single day ? I had heard that some groups in >the USA might be doing this & would like some feedback, either positive or >negative on how well it works out. > > I would really like to hear from divers who have been down this route >and have something to say. I do *not* want to attract a host of opionated >replies from people who haven't 'been there'...but who feel they want to make a >statement anyway. No doubt I will get some anyway...but try & restain >yourselves. > > Regards, Steve M. > >************************************************************************** >* * * >* Dr. S. G. Millard, * E-Mail : ec96@li*.ac*.uk* * >* Senior Lecturer, * * >* Department of Civil Engineering * Tel : 0151 794 5224 (UK) * >* University of Liverpool, * 44 151 794 5224 * >* PO Box 147, * (International) * >* Liverpool L69 3BX, * * >* UK. * Fax : 0151 794 5218 (UK) * >* * 44 151 794 5218 * >* * (International) * >* * * >************************************************************************** > > > >-- >Send mail for the `techdiver' mailing list to `techdiver@terra.net'. >Send subscription/archive requests to `techdiver-request@terra.net'. > > John Chatterton
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