Deco Diving

General banter about diving and why we love it.
Nwcid
Extreme Diving Machine
Posts: 459
Joined: Wed Dec 14, 2011 9:00 pm

Deco Diving

Post by Nwcid »

So I have been reading as much as I can about areas related to diving that we are considering. One area I seem to have trouble finding good information on is decompression diving. I am not planning on reading a book and heading out to do it.

I would like to be able to read a book or web based facts (or as close as possible) about the theory of deco diving and even how mixed gas along with partial pressure effect it. I know the standard answer is probably "take a class" which is understandable before we actually do it. Right now I am just looking to understand it better.
John

Check out my site, http://scubadivesites.webs.com/
User avatar
CaptnJack
I've Got Gills
Posts: 7776
Joined: Fri Jul 07, 2006 2:29 pm

Re: Deco Diving

Post by CaptnJack »

Deco for divers by Mark Powell
Sounder wrote:Under normal circumstances, I would never tell another man how to shave his balls... but this device should not be kept secret.
User avatar
Norris
NWDC Moderator
NWDC Moderator
Posts: 4695
Joined: Wed Sep 03, 2008 2:31 pm

Re: Deco Diving

Post by Norris »

Google is your friend

some ideas?

Scuba: How does tri mix work

information on deco diving

etc..

Lots of information out there.
**Pinch it, don't stick your finger through. You're just pinching a bigger hole.
CAPTNJACK - 2012**
Nwcid
Extreme Diving Machine
Posts: 459
Joined: Wed Dec 14, 2011 9:00 pm

Re: Deco Diving

Post by Nwcid »

Well maybe my google-fu has been weak.

The places I have seeing and reading seem to really skirt around details. There is a lot of talk about what it is but not how to actually do it or how it actually works. Most seem to come back and say "find and instructor".

I will say I do understand why some of this information is kinda guarded. No one wants to be the one where the "idiot" or the "I can lean it all by reading guy" goes out and gets hurt.
Last edited by Nwcid on Mon Jul 22, 2013 1:08 pm, edited 1 time in total.
John

Check out my site, http://scubadivesites.webs.com/
User avatar
kdupreez
I've Got Gills
Posts: 1724
Joined: Mon Apr 20, 2009 3:27 am

Re: Deco Diving

Post by kdupreez »

CaptnJack wrote:Deco for divers by Mark Powell
+1 bazillion!!

There is no other book better than this!! worth its weight in gold!

Its written in plain english for mere mortals and demystifies all those deep medical terms and complex physics algorithms, etc.

I loved this book, it also has all the technical details if you want it.. in fact, it has enough details in later sections (that you can skip if you want) to write your own deco planning software!!

seriously, best.. book.. ever!
"I believe that if life gives you lemons, you should make lemonade... And try to find somebody whose life has given them vodka, and have a party" - Ron White
User avatar
kdupreez
I've Got Gills
Posts: 1724
Joined: Mon Apr 20, 2009 3:27 am

Re: Deco Diving

Post by kdupreez »

Oh.. and go check your PM :angelblue: I hear koos-mas came early this year :rofl:

And also, The Rubicon Foundation is your friend!

http://rubicon-foundation.org

LOTS of info there.
"I believe that if life gives you lemons, you should make lemonade... And try to find somebody whose life has given them vodka, and have a party" - Ron White
User avatar
LCF
I've Got Gills
Posts: 5697
Joined: Tue May 30, 2006 5:05 pm

Re: Deco Diving

Post by LCF »

If what you are looking for is a book that will give you the precise execution for specific staged decompression dives, I don't think there is one. Deco for Divers will give you a ton of information about nitrogen dynamics and how decompression profiles are built, but even if you understand all the material, there are quite a few assumptions that have to be made by the diver, to decide exactly how the decompression for a given dive will be done.

I believe you can still buy the Ratio Deco online classroom from Unified Team Diving, which is probably the closest thing to a cookbook approach to deco that you will find, I think -- but it still makes assumptions, like what gas you are breathing, and the rough parameters of your dive.

If you are contemplating doing this, I would also HIGHLY recommend Steve Lewis's book,Six Skills and Other Discussions, which is available in a Kindle edition. It's very well written and quite useful, but it still won't give you a "Step A, Step B, Step C" approach to staged decompression diving.
"Sometimes, when your world is going sideways, the second best thing to everything working out right, is knowing you are loved..." ljjames
User avatar
Marc
Extreme Diving Machine
Posts: 411
Joined: Fri Mar 31, 2006 10:51 am

Re: Deco Diving

Post by Marc »

Who wants to hang in cold, green water for a long time with nothing to look at anyway?
Reporter: "The helmet has a special meaning for many drivers. How important is it to you?"

Raikkonen: "It protects my head."
User avatar
CaptnJack
I've Got Gills
Posts: 7776
Joined: Fri Jul 07, 2006 2:29 pm

Re: Deco Diving

Post by CaptnJack »

Blitz wrote:Who wants to hang in cold, green water for a long time with nothing to look at anyway?
Some guy named Nailer99 apparently.
Sounder wrote:Under normal circumstances, I would never tell another man how to shave his balls... but this device should not be kept secret.
User avatar
Marc
Extreme Diving Machine
Posts: 411
Joined: Fri Mar 31, 2006 10:51 am

Re: Deco Diving

Post by Marc »

I think the ringing of the hammer after all these years has made his head soft.
Reporter: "The helmet has a special meaning for many drivers. How important is it to you?"

Raikkonen: "It protects my head."
User avatar
CaptnJack
I've Got Gills
Posts: 7776
Joined: Fri Jul 07, 2006 2:29 pm

Re: Deco Diving

Post by CaptnJack »

Blitz wrote:I think the ringing of the hammer after all these years has made his head soft.
I've heard the lack of hair for padding does that.
Sounder wrote:Under normal circumstances, I would never tell another man how to shave his balls... but this device should not be kept secret.
User avatar
BillZ
Aquanaut
Posts: 687
Joined: Mon Mar 03, 2008 12:23 am

Re: Deco Diving

Post by BillZ »

Another thumbs up for Deco For Divers - It will help you answer your question about "how it actually works" and the science (and history of the science) behind it.

About 3 months ago was looking for the same info that you're looking for so I could start getting ready for Tech 1. I was also a bit skeptical about Ratio Deco - It seemed a bit too simple - and wanted to understand what was behind it. I did the Google search for information on decompression diving/Ratio Deco and came up with either white papers that were way over my head or arguments on diving boards. Deco for Divers helped me understand what's behind the different decompression models and how they were developed.

The next step for me is to download a copy of V-Planner and simulate a few dives using various models and then comparing them to ratio deco profiles. This will help me start to answer the "how to actually do it" question.

FYI - GUE has some good material on ratio deco that they put on the internet - If you Google gue_ratio_deco you'll find it.
Nwcid
Extreme Diving Machine
Posts: 459
Joined: Wed Dec 14, 2011 9:00 pm

Re: Deco Diving

Post by Nwcid »

All great info and things I will look into.

Not looking so much at a "cook book" but some of the how's and why's. Something to give me more background.

Like one of the questions I have is how much deco do you are you obligated for after each min over NDL? I am sure it also has to do with depth and gas mix and is not a straight forward answer.

As i said when we are ready for that step we know where to find some great instructors :)
John

Check out my site, http://scubadivesites.webs.com/
User avatar
Joshua Smith
I've Got Gills
Posts: 10242
Joined: Mon Apr 03, 2006 9:32 pm

Re: Deco Diving

Post by Joshua Smith »

CaptnJack wrote:
Blitz wrote:I think the ringing of the hammer after all these years has made his head soft.
I've heard the lack of hair for padding does that.
Lies. All lies.


It's a combination of repeated head injuries and some poor choices involving mixing the wrong recreational drugs in my youth.
Maritime Documentation Society

"To venture into the terrible loneliness, one must have something greater than greed. Love. One needs love for life, for intrigue, for mystery."
User avatar
Joshua Smith
I've Got Gills
Posts: 10242
Joined: Mon Apr 03, 2006 9:32 pm

Re: Deco Diving

Post by Joshua Smith »

Nwcid wrote:All great info and things I will look into.

Not looking so much at a "cook book" but some of the how's and why's. Something to give me more background.

Like one of the questions I have is how much deco do you are you obligated for after each min over NDL? I am sure it also has to do with depth and gas mix and is not a straight forward answer.

As i said when we are ready for that step we know where to find some great instructors :)
Its as simple as this: depth plus time at depth equals deco. The deeper you go, and the longer you stay, the more it costs. The variables are endless after that. What gasses are you breathing? Cold or warm water? Are you a 29 year old triathelete or a 49 year old desk jockey who doesn't exercise?

What you need next is an algorithm, a formula, to calculate deco and allow you to plan. I have used vplanner for a long time, and it seems to work well for me.

I would urge you to take a class like advanced nitrox and deco procedures to really learn how to plan a deco dive safely.
Maritime Documentation Society

"To venture into the terrible loneliness, one must have something greater than greed. Love. One needs love for life, for intrigue, for mystery."
User avatar
loanwolf
Pelagic
Posts: 945
Joined: Mon Jan 07, 2008 7:20 am

Re: Deco Diving

Post by loanwolf »

The Navy Dive manual is a interesting place to read up on some of that as well.


http://www.usu.edu/scuba/navy_manual6.pdf
Greg
Life is Short do as Much as Possible in as Short of Period of Time as Possible.
User avatar
CaptnJack
I've Got Gills
Posts: 7776
Joined: Fri Jul 07, 2006 2:29 pm

Re: Deco Diving

Post by CaptnJack »

Nwcid wrote: Like one of the questions I have is how much deco do you are you obligated for after each min over NDL? I am sure it also has to do with depth and gas mix and is not a straight forward answer.
Not as much as you'd think. Assuming you are in the range where you have an NDL at all (<140ft or so) using air or nitrox.
Sounder wrote:Under normal circumstances, I would never tell another man how to shave his balls... but this device should not be kept secret.
User avatar
Dusty2
I've Got Gills
Posts: 6388
Joined: Wed Mar 21, 2007 9:04 pm

Re: Deco Diving

Post by Dusty2 »

My formula is the best one out there, Avoid it at all costs! :rofl:
User avatar
kdupreez
I've Got Gills
Posts: 1724
Joined: Mon Apr 20, 2009 3:27 am

Re: Deco Diving

Post by kdupreez »

Dusty2 wrote:My formula is the best one out there, Avoid it at all costs! :rofl:
Dive till it hurts, deco till it stops? :neener:
"I believe that if life gives you lemons, you should make lemonade... And try to find somebody whose life has given them vodka, and have a party" - Ron White
User avatar
LCF
I've Got Gills
Posts: 5697
Joined: Tue May 30, 2006 5:05 pm

Re: Deco Diving

Post by LCF »

I dunno -- about the 25th minute in 43 degree water, deco HURTS!
"Sometimes, when your world is going sideways, the second best thing to everything working out right, is knowing you are loved..." ljjames
defied
I've Got Gills
Posts: 2057
Joined: Wed Sep 17, 2008 8:14 pm

Re: Deco Diving

Post by defied »

kdupreez wrote:
Dusty2 wrote:My formula is the best one out there, Avoid it at all costs! :rofl:
Dive till it hurts, deco till it stops? :neener:
When did you move to UTD?


>0]
User avatar
CaptnJack
I've Got Gills
Posts: 7776
Joined: Fri Jul 07, 2006 2:29 pm

Re: Deco Diving

Post by CaptnJack »

defied wrote:
kdupreez wrote:
Dusty2 wrote:My formula is the best one out there, Avoid it at all costs! :rofl:
Dive till it hurts, deco till it stops? :neener:
When did you move to UTD?


>0]
Heard it was a couple weeks after you did Fundies.
Sounder wrote:Under normal circumstances, I would never tell another man how to shave his balls... but this device should not be kept secret.
User avatar
Jeremy
I've Got Gills
Posts: 1547
Joined: Sat Jul 16, 2011 3:25 pm

Re: Deco Diving

Post by Jeremy »

This thread is awesome
Nwcid
Extreme Diving Machine
Posts: 459
Joined: Wed Dec 14, 2011 9:00 pm

Re: Deco Diving

Post by Nwcid »

Jeremy wrote:This thread is awesome

Well they do say there is what you learn in the book/class and then there is the way it really works :rofl:
John

Check out my site, http://scubadivesites.webs.com/
User avatar
Jeremy
I've Got Gills
Posts: 1547
Joined: Sat Jul 16, 2011 3:25 pm

Re: Deco Diving

Post by Jeremy »

lol

Yeah..I have deco for divers, not exactly light reading but not actuarial science either. I learned a ton from it. Great book.

I have yet to incur a deco obligation in my diving career. That's probably because I dive 32% in single steel HP 100's and basically just don't have enough gas to incur a deco obligation.

Someday though...deco will call my name.
Post Reply