Deco cylinders O2 over pressurized

[rjack321]

I have never heard of this being done. It would be very hard to do because the valves are so different, and there would be no reason to do it.

In the way way olden cave project days (1960s and even into the 80s) people would take big steel industrial O2 cylinders underwater since there were no boosters, personal transfill whips were rare, and they needed the volume - in part because decompression algorithms were at best primitive, so when in doubt do a lot.

At the end of the project, just return the o2 bottle to the gas supply store. Not entirely sure what they were using for 1st stages, welding regs I suspect.

 

[Celt]

Still use the j bottle (industrial) just put a fitting on it .

 

[kensuf]

Yes, NAUI Cave 1 has no deco, certifies you to dive unsupervised using 3rds and up to 2 navigation decisions. Getting your AN/DP and logging 20 unsupervised cave dives are prerequisites for Cave 2.

Stepping in to clarify something about NAUI Cave and TDI Cave standards.

Those are the old NAUI standards. There was an update in January 2020, new C1 limits are 1/3rds for penetration, only 1 navigational decision, and if the student was previously trained in deco, up to 10 minutes of deco.

NAUI C2 used to require you to take an OW deco program prior to the class (and it was only 5 dives), but during that same standards update C2 was increased to 8 dives and includes decompression training.

TDI Full Cave does not teach decompression and is not a deco program. If someone is going to be doing decompression in a TDI Full Cave program they are required to have decompression training, by standards. To simplify this, there is a TDI "Cave Deco" specialty that your instructor may be able to teach in conjunction with a full cave program. It adds 2 dives to the program (10 dives vs 8) and includes the use of 100% oxygen for decompression. Cave Deco is an instructor distinctive specialty, any TDI instructor that meets the qualifications can become a Cave Deco instructor. To become a Cave Deco instructor a TDI instructor must be a Full Cave Instructor, a TDI Advanced Nitrox instructor, and a TDI Decompression Procedures instructor.

 

[p_kos]

Stepping in to clarify something about NAUI Cave and TDI Cave standards.

Those are the old NAUI standards. There was an update in January 2020, new C1 limits are 1/3rds for penetration, only 1 navigational decision, and if the student was previously trained in deco, up to 10 minutes of deco.

NAUI C2 used to require you to take an OW deco program prior to the class (and it was only 5 dives), but during that same standards update C2 was increased to 8 dives and includes decompression training.

TDI Full Cave does not teach decompression and is not a deco program. If someone is going to be doing decompression in a TDI Full Cave program they are required to have decompression training, by standards. To simplify this, there is a TDI "Cave Deco" specialty that your instructor may be able to teach in conjunction with a full cave program. It adds 2 dives to the program (10 dives vs 8) and includes the use of 100% oxygen for decompression. Cave Deco is an instructor distinctive specialty, any TDI instructor that meets the qualifications can become a Cave Deco instructor. To become a Cave Deco instructor a TDI instructor must be a Full Cave Instructor, a TDI Advanced Nitrox instructor, and a TDI Decompression Procedures instructor.

I stand corrected. I was going off my memory doing it few years back. Thanks for the update. When I did it my instructor had additional requirements like doing NAUI Intro to Tech with him to start so he knew you wouldn’t waste your time showing up for Cavern and C1 unprepared. He also preferred Tech 1 prior to C2 but accepted equivalents if he knew you were reliably skilled. I though it was a sensible approach.

 

[Imbodie]

Your PDF manual from 3 months ago is still the old Tec Deep Manual and Dive 4 in the manual is from the the old Tec Deep and Apprentice Tec curriculum. Scroll down and you will see a Training Dive 5...which does not exist in the Tec 40 curriculum.

You are reading about Training Dive 4 from Page 180 in the Tec Deep Manual. Click your Tec 40 independent Study Assignments link in the PDF manual or look at the handouts your instructor provided you. You will see that the PDF Manual content for Tec 40 ends at Emergency Procedures II, Tec Exercise 2.6 which is on Page 129. You are not following the Tec 40 curriculum which bounces between the handouts and the manual.

@boulderjohn posted the actual Tec 40 Dive 4 standards from the instructor manual and that dive is an actual decompression dive. Your Tec 40 instructor can confirm that and show you the Tec 40 training dive requirements from the Tec 40 Standards.

I"m sorry... I don't see how you can be correct in that statement. I followed the Tec-40 section page by page and it did not end at page 129.

 

[Imbodie]

Stepping in to clarify something about NAUI Cave and TDI Cave standards.

Those are the old NAUI standards. There was an update in January 2020, new C1 limits are 1/3rds for penetration, only 1 navigational decision, and if the student was previously trained in deco, up to 10 minutes of deco.

NAUI C2 used to require you to take an OW deco program prior to the class (and it was only 5 dives), but during that same standards update C2 was increased to 8 dives and includes decompression training.

TDI Full Cave does not teach decompression and is not a deco program. If someone is going to be doing decompression in a TDI Full Cave program they are required to have decompression training, by standards. To simplify this, there is a TDI "Cave Deco" specialty that your instructor may be able to teach in conjunction with a full cave program. It adds 2 dives to the program (10 dives vs 8) and includes the use of 100% oxygen for decompression. Cave Deco is an instructor distinctive specialty, any TDI instructor that meets the qualifications can become a Cave Deco instructor. To become a Cave Deco instructor a TDI instructor must be a Full Cave Instructor, a TDI Advanced Nitrox instructor, and a TDI Decompression Procedures instructor.

So, silly question... Does that mean when I finish Tec-40 I can then start doing deco dives under the Tec-40 guidelines? (no more than 10 minutes on 50%) and is there still a 100' max bottom depth? I mean I really don't know how I would get into a deco obligation... all the dives I've done are not long/deep enough to have gotten me there yet. I got close at Jackson Blue... but it has always been "close" (within 10 minutes). I've only put my computer into deco once and that was because I didn't set it for the right mix I was using and instead left it on air... I completed the deco even though I didn't have to.

 

[Manatee Diver]

I mean I remember my first Deep dive... in an advanced class... no one told me my regulator would flow differently, I was totally pissed at my instructor for NOT sharing that little detail...

I am confused, my regs breath largely the same until gas density becomes an issue.

I've ever only done one jump on a given dive.. you can't do circuits, you can't carry stages... so where you going with 3 jumps???

3 jumps is easy in Mexico. But I can do 2-3 in Ginnie on standard thirds. But I just love exploring rather than going for distance.

 

[Whitrzac]

I am confused, my regs breath largely the same until gas density becomes an issue.



3 jumps is easy in Mexico. But I can do 2-3 in Ginnie on standard thirds. But I just love exploring rather than going for distance.

Neglected, cheap, unbalanced regs breath different at depth...
AKA most rental regs, which someone taking an aow class might be using

 

[Imbodie]

I am confused, my regs breath largely the same until gas density becomes an issue.



3 jumps is easy in Mexico. But I can do 2-3 in Ginnie on standard thirds. But I just love exploring rather than going for distance.

Older mix and match reg set... and it didn't get harder to breath.. I thought I was having a free flow.

It's not about going for the distance, its about incrementally learning the cave. I've only done jumps in Peacock.... I don't dive Ginnie enough to do any jumps.

 

[Imbodie]

Neglected, cheap, unbalanced regs breath different at depth...
AKA most rental regs, which someone taking an aow class might be using

well I actually owned my regs, but they were older... the 2nd stage was adjustable and incidentally opened up wide... which was where the issue came from... I continued to dive that reg set until 2019 (the AOW class was in 2002) I retired it rather than servicing it.. it was easily 10 years old when I got it.