Decompression Tables for Nitrox

[descent]

... very likely not going to cause you to melt like a nazi opening the ark of the covenant.

I was nodding along with your appeals to our subtler and finer reasoning skills, and now I am trying to explain my sudden outburst of maniacal cackling to Mrs Descent. I hope there is a novel growing on your hard drive.

Wish I could have said all that as well as you.

... That being said, CNS is a tricky bitch...there's no way to say with 100% confidence that a single breath at 1.65 won't kill you (or, for that matter, a single breath at 1.4).

Yes. That is the ugliest knot in an unpleasant puzzle.

Richard Pyle mentions brief exposures to 3.0, or even 4.0, with no apparent ill effect. I did the standard 2.8 for thirty minutes and nothing happened to me, just like similar amounts of nothing happened to 98% percent of the other people over the years.

Then there are stories featuring conservative OTUs, except with some exertion, or some cold, or some repet or multi-day diving, and we are left wondering how a person could survive something so swift and unforgiving.

 

[djdalite]

Google

*Chuckle

Thanks, I haven't had much luck though

 

[tomfcrist]

*Chuckle

Thanks, I haven't had much luck though

Are you serious? you really cant find a single article that explains the theory of why people dive nitrox, or even what the pros/cons of nitrox are?

 

[Searcaigh]

CNS and OTU's are not tracked

IANTD cover these points, and have a pre-dive planning table to calculate the above as well as gas planning.

Of course you have to make your own calculations (this example is for tri-mix though)

MSW	MIX	ATA	END	TIME	PO2	%CNS	Ox Tox Unit	GAS NEEDED
					PO2=ATAxFO2	PO2 from table	PO2 from table	20L/min
						multiply by time	multiply by time
60
57
54
51
48
45	28/25	5.5	22.7	20	1.54	20.8	38.6	2200
42
39
36
33	28/25	4.3	15.5	3	1.204	1.41	3.99	258
30
27
24
21
18	50	2.8
15	50	2.5	5.8	1	1.25	0.52	1.48	50
12	50	2.2	3.9	1	1.1	0.42	1.17	44
9	50	1.9	2	1	0.95	0.31	1	38
6	50	1.6	0.1	7	0.8	1.54	4.62	224
4.5
				35		25	50.86	2814
CNS%	25
O.T.U.	50.86
Run Time	35
Gas	Bottom Mix	3687
	Deco Mix	427.2

Of course once you have had training and understand VPN, you can use that programme.

 

[chrisch]

Remy, if you want to explore the differences between different dive gasses I suggest you download and experiment with a computer program. There are a few free ones (try HLPlanner - FREE VPM-B based decompression software)

You can changes gasses to your heart's content, back gas, deco gas and so on. It is no substitute for doing a mixed gas or accelerated decompression course, but we have seen you have a thirst for knowledge and I am sure this will help answer all sorts of your questions. I am sure it will give you some more new ones to post up as well

 

[Diver0001]

I'm curious to know what are the decompression tables for Nitrox, any body can share this with me or send me a .pdf

I know BSAC have them but did not find a clear image from them.

I will do a Nitrox course in January, but I'm sure PADI will have nothing on it or am I wrong ? I only find NO-decompression tables.

Thanks

You might be able to find the IANTD ones online. Also there are also software that does it, like vplanner. Please do not engage in extended range diving unless you have taken the proper course(s) for it. Getting it wrong could have serious consequences.

R..

 

[shoredivr]

Remy, if you want to explore the differences between different dive gasses I suggest you download and experiment with a computer program. There are a few free ones (try HLPlanner - FREE VPM-B based decompression software)

You can changes gasses to your heart's content, back gas, deco gas and so on. It is no substitute for doing a mixed gas or accelerated decompression course, but we have seen you have a thirst for knowledge and I am sure this will help answer all sorts of your questions. I am sure it will give you some more new ones to post up as well

Excellent and sensible suggestion.

 

[tursiops]

I guess I'll repeat what I said earlier: he can learn almost everything on his questions list by just playing with the planning mode on his computer. With almost zero learning curve, no confusion, and no cost. Then, if he still thirsts for more knowledge, try some software.

My concern about sending him to Google is that there is at least as much wrong information out there as there is good information. And I doubt he can distinguish between them without more background.....which is what taking the course should give him.

Look into the CRAP index. 4.4 Source Credibility - Internet Literacy

 

[victorzamora]

*Chuckle

Thanks, I haven't had much luck though

Wikipedia is actually full of phenomenal information on this exact subject. It's where I learned all of my Rec Nitrox info before taking a good tech class (my nitrox class SUCKED).

 

[Aquabot]

IANTD cover these points, and have a pre-dive planning table to calculate the above as well as gas planning.

Of course you have to make your own calculations (this example is for tri-mix though)

MSW	MIX	ATA	END	TIME	PO2	%CNS	Ox Tox Unit	GAS NEEDED
					PO2=ATAxFO2	PO2 from table	PO2 from table	20L/min
						multiply by time	multiply by time
60
57
54
51
48
45	28/25	5.5	22.7	20	1.54	20.8	38.6	2200
42
39
36
33	28/25	4.3	15.5	3	1.204	1.41	3.99	258
30
27
24
21
18	50	2.8
15	50	2.5	5.8	1	1.25	0.52	1.48	50
12	50	2.2	3.9	1	1.1	0.42	1.17	44
9	50	1.9	2	1	0.95	0.31	1	38
6	50	1.6	0.1	7	0.8	1.54	4.62	224
4.5
				35		25	50.86	2814
CNS%	25
O.T.U.	50.86
Run Time	35
Gas	Bottom Mix	3687
	Deco Mix	427.2

Of course once you have had training and understand VPN, you can use that programme.

Yes I'm aware. But my comment was in regards to just using EAD to get deco stops on a navy deco table. It does not track the CNS or OTU's. Those have to be calculated (by hand or using a planing software)like I mentioned earlier.

Your comment reiterates the one thing I have been saying this whole time, the need for training.