Question about learning deco procedures

[boulderjohn]

@Bent Benny I think you want to have a look at PADI Tec 40.

I am not a PADI diver. @boulderjohn could definitely answer this.

PADI's Tec 40 certification does allow you to do up to 10 minutes of decompression at a maximum depth of 130 feet using up to 50% O2 for decompression.

As for doing it in a single tank, it is possible to do so if you use a single tank with a dual valve. You have to have two regulators on your primary gas supply so that if one fails, you can shut it down and go to the other. That is pretty rare, though. A more common approach (I assume--haven't seen it) would be to use a single tank with a pony bottle, which is also acceptable because of the two regulators. Every student I have ever had is taking the course as preparation for full tech diving, so they are using full doubles, either backmount or sidemount.

With the growing trend to using using pony bottles on routine recreational dives, I would think the idea of getting more bottom time through a program like this would be popular. With a pony bottle, you are supposed to finish the planned dive on your primary gas with the pony in reserve. That would satisfy the requirement for the Tec 40 course as well. For your post course diving, you don't have to have a separate deco gas on your dive if you don't want to. The only difference between a basic recreational dive with a pony and a Tec 40 dive with a pony could be the fact that with the latter you can violate NDLs and do up to 10 minutes of deco.

 

[chrisch]

...
As for doing it in a single tank, it is possible to do so if you use a single tank with a dual valve. You have to have two regulators on your primary gas supply so that if one fails, you can shut it down and go to the other. That is pretty rare, though. A more common approach (I assume--haven't seen it) would be to use a single tank with a pony bottle, which is also acceptable because of the two regulators. Every student I have ever had is taking the course as preparation for full tech diving, so they are using full doubles, either backmount or sidemount.....

It might meet the criteria for training, but a single is going to need to be huge if you want to do this type of diving. I would have thought (and you confirm) everyone at this stage is on doubles.

I am sure someone can work through an example with your (crazy) pounds and feet - I can in metric if you like.

 

[Gareth J]

I

I am sure someone can work through an example with your (crazy) pounds and feet - I can in metric if you like.

Like it,

 

[Zef]

... a single tank with a dual valve. You have to have two regulators on your primary gas supply so that if one fails, you can shut it down and go to the other. That is pretty rare, though

Not rare at all in western Europe.

-Z

 

[boulderjohn]

It might meet the criteria for training, but a single is going to need to be huge if you want to do this type of diving. I would have thought (and you confirm) everyone at this stage is on doubles.

I am sure someone can work through an example with your (crazy) pounds and feet - I can in metric if you like.

People frequently go right up to the edge of deco (and over) with the tanks commonly used on dives. It does not take a huge tank to achieve 21 minutes of bottom time at 100 feet, and that would put you into deco on the PADI tables.

 

[SJT1961]

Don't mean to hijack the thread in anyway, but can anyone suggest good instructors for AN/DP in Tampa area or within central Florida?

 

[ChuckP]

With the growing trend to using using pony bottles on routine recreational dives, I would think the idea of getting more bottom time through a program like this would be popular.

This is exactly why I'm taking the Tec Classes - increase in bottom time at or just below recreational depths. One of the dilemmas is to side mount or not.......

Another reason in leading to the tech classes was the what if situation of accidentally entering deco and not really understanding what the obligation may be - you can't plan an accident but at least you can train for one.

 

[Compressor]

I've searched for the answer to this but can't find it. Is there a rec diver course that teaches how to make deco dives? I have been taught to never violate NDL, but I know people do make deco dives. Is this something that is only taught in tech diving courses? I am specifically asking about deco dives that are within recreational depth limits.

I know that nitrox is an option to extend NDL. Honestly I'm still working on improving my trim/buoyancy/SAC that I don't get near NDL anyway.

Anytime there is a physical barrier (Cave or Decompression ceiling) to the surface the scope of diving is changed. Need proper training and dive management for this kind of diving otherwise one can pay with their life. So its not something to take lightly.

 

[kensuf]

Don't mean to hijack the thread in anyway, but can anyone suggest good instructors for AN/DP in Tampa area or within central Florida?

AN/DP should be a 4 day course and you should go into it reasonably comfortable in either sidemount or doubles configuration. I teach out of High Springs and usually use Hudson Grotto as the last dive day for AN/DP, if I can be of assistance, please drop me a note. I can also recommend several people in the Crystal River / Tampa area as well.

 

[kelemvor]

Don't mean to hijack the thread in anyway, but can anyone suggest good instructors for AN/DP in Tampa area or within central Florida?

If you don't mind driving to Pinellas, call Bob Henn with Sunshine scuba. 727-585-0938. He's teaching through NASE primarily right now I believe. I don't know anyone in Hillsborough, although I'm sure there are plenty over there.