Mailing List Archive Mailing List Archive
Kev, I answered this privately to you - I did not know it was a list message. We use trimix for the deep deco. The deco models already account for the different gases - there is no need to add "safety" factors, they are merely adding to the stops and ballooning the shallow stops, which makes no sense - the shallow stops quickly max out and go level for longer bottom times. The trick is getting no damage, either by the action of the gas you are breathing, by bubbles, or by mechanical damgage due to movement at depth ( we scooter deep), and then shaping the deco curve properly. I did 210 minutes at 300 with 11.5 deco, and did not get above 200 feet until 300 minutes run time. Most people would have called that a 310 minute bottom time - 10 to get dwon , 210 at max deoth, and 90 more between 300 and 200. I called it deco from 270 on up. Kevin Connell wrote: > > At 10:29 AM 10/3/97 -0400, you wrote: > > The fact is that at WKPP we long ago discovered the inefficiency and > >danger of deep air, high ppo2's, and the combination ( deep nitrox) as > >we came off of mix onto deco gases or as we tried to conduct > >sophisticated dive objectives . We no longer use high PPN2's. We also > >discovered that the decompression off of high PPN2's was all but > >impossible without symptoms, and we attribute this to damage caused by > >them. We use helium-based mixes now instead. > > G - I know your deco is proprietary, but are you saying that the damage > PPN2's cause (rigid cell damage) contribute to DCS and therefore diving a > He mix allows a similar profile (more intermediate/deep stops maybe?) > without the damage of the high PPN2's and dcs - I've also heard you scorn > "helium padding" etc > > And on this subject - I'm no deco PhD, but if helium absorbs faster into > the tissues, doesn't it diffuse faster too? > > -------------------------------------------------------------------------- > Kevin Connell <kevin@nw*.co*> > > Northwest Labor Systems > http://www.nwls.com > Bellingham, WA > --------------------------------------------------------------------------- > -- > Send mail for the `techdiver' mailing list to `techdiver@aquanaut.com'. > Send subscribe/unsubscribe requests to `techdiver-request@aquanaut.com'. -- 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]