Mailing List Archive Mailing List Archive
Steve, Yes I have made two mix dives to the depths you reference and deeper as rep dives. I ususally have at least a four hour surface interval for these excursions. I use two table procedures one is the waterproof tables by IANTD and todate the proplanner for the exact dive profiles. I know some instructors who do two training dives a day on gas. To date I have no knowledge of anyone taking a hit doing this. It will certainly be safer to do two mix dives than two air dives to those depths. Tom mount on You wrote: > > 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'. >
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]