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LoCz

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Can anyone explain to me what a no-decompression stop is exactly?

Is it timing your dive so that your fluctuating between depths so you dont have to do a deco stop? Also I would really like to start reading up on how to use dive tables before I take my open water course, does any one know of any websites with significant stuff?

Thx guys :)

:confused:
 
LoCz,

I think I will leave the Decompression stuff to the heavy hitters (I am assuming you were asking for Dr DECO's input since you posted it here which I am sure he will gladly respond) but as for the "Dive Tables" I would say the best thing to do is to start reading your dive class manuals...

Mario may also be able to repost some of those great links he had of the actual charts online.

=-)


(hmmm, for some darn reason I had to type this out 3 times before it stuck, web is acting weird tonight, anyone else noticing this? I know that this morning the UUNET backbone had some real trouble and I couldn't even reach this board at anything better than .5 to 1k a second if at all)

 
There are so many variations of the tables to begin with, where should I start?

http://www.naui.org/table.htm are the NAUI tables...

http://www.iantd.com/comparison.html is a comparisson of dive tables...

http://www.bwl.uni-mannheim.de/Dekanat/homepages/alexv/tables.htm is yet another link to explore...

http://www.diversresource.com/resources/divetables/ has some cool table stuff...

http://rtsx-109.umd.edu/UMd/DiveTables/Navy_Tables.html is a neat place to look at tables...

http://www.tdconline.com/tables/tablesuse.shtml focuses on SSI tables...

http://www.mindspring.com/~rgonzalez/scuba/tables.htm are the PADI dive tables...

http://www.iro.umontreal.ca/~legua/rec/Nitrox/n2o2_m42.htm simple Nitrox info...

http://tcso.home.texas.net/divetables_usn.htm The US Navy dive tables...

http://www.ultranet.com/~jmitchel/script/test.html Helps calculate necessary conversions...

http://www.sunpath.com/scuba/tables.htm An annoying site with more table info...

And the list goes on and on... I'm sure I can help out with a little more specific info...

Mario :D

 
I'm not really familiar with the term "no-decompression stop." But I suppose you could apply it to any stop you make during an ascent that is not required by your decompression schedule. In all the agencies I know of, a "safety stop" at the end of a dive is recommended, though not required, and could be considered a "no-decompression" stop... A "decompression stop" on the other hand, is a stop at a specific depth for a specific time during your ascent from a dive that is required by the tables or the computer that you're using for the dive, and is made for the purpose of offgassing enough nitrogen to allow you to continue the ascent safely - avoiding DCS.
Rick
 
Thx for the replies :)

Ok i thik iv got it. But about the dive tables, there there to help assist planning of dives yes? So what happens when you are diving in a plave where you have no idea how deep it is or what the bottom features look like?
Obviously this isnt recomended unless you are an experienced diver. Im guessing that you would use a computer to help you...like if you where also diving at different depths throughout your dive. hmmm
 
Utilizing a computer in just about every type of diving environment is imperitive. Someday in our lifetimes, computer use will be required. There are already agencies whom choose to teach only with computers, but cover table useage during a 'history' portion of the training process.

But for all intents and purposes, NoDeco diving is recrealtional diving. The rec tables are designed to display and plan dives or series of dives that don't require mandatory stops. The purpose of the stops are basically to allow enough time to "off-gas" a term you'll be hearing a lot throughout your advanced training.

When tech diving, we usually expose ourselves to increased level of Nitrogen "on-gassing" that must be "off-gassed" through multiple stops at specif depths for specific times. This is where it begins to get complicated, so I'll leave it alone until you begin your advanced training... once that time comes, ask specific, and we'll give specific...

L8r dOOd,
Mario :D
 
LoCz,
Relax! Be cool... All will come clear to you as you progress through your course.
Rick :)
 
Thx for the links and advice guys. But i need to know everything about everything : / thats just the way i am. Heh dont worry Mario iv been studying biology for the last 4 years so that sort of info is cool....anyway im off to read about the characteristics of Nitrogen bonding in the blood with haem groups etc etc.
:idea:
 
Hmmm i forgott something. Dr Deco have you got any web sites on the molecular side of nitrogen absorption and off gassing etc? that would be great thx :)
 
LoCz,
Chemically, Nitrogen is about as simple as it gets. A non-reactive (inert) gas, there's no bonding or reaction to worry about. The gas just disolves into the blood and tissues relative to the partial pressure of the gas inhaled and then comes back out (and if it comes back out too fast it forms bubbles and that is bad) as pressure is reduced. Where it gets sticky is that we don't fully understand the rates of absorption, the rates of release, the variability of rates in different tissues under different conditions, and while we have a pretty good handle on the mechanics of bubble formation, we don't have such an excellent handle on the details of conditions created by fluid flows and pressures in the body or the dynamics of tissue interelations as they apply to the creation of conditions conducive to bubble formation.
So, on the chemical side we have a simple problem, while on the mechanical side things get very complicated and elusive indeed.
Use the tables/dive computer conservatively, watch your ascent rate, do your safety stop, and (my personal hint) take a full minute from the time you leave your safety stop until you break the surface.
Rick
 
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