Gases

[DA Aquamaster]

On a trip where you may be doing several dives and may not have a lot of access to O2, filling one bottle with 50% and the rest of your limited number of deco bottles with 100% may make sense.

With proper dive planning and gas mixing you can start with 100% and 50% on the first dive and then top the 100% bottle off with air to obtain a full bottle of 50% for the subsequent dive, so you can get more miles per deco bottle by essentially using all but one of them twice. It works as long as you end the dives with at least 1100 psi of O2 in the 100% O2 bottles, have a compressor that produces O2 compatible air and have an analyzer along.

 

[Curt Bowen]

Can I ask a question for deco divers that dive within air limits (70m),,,

1. What gases do you take for travel, back and deco?

Tell me the variations of the diving because my question is very open.

I am very very intersted to hear experiences.

boogey

Keep it simple

Heliair 14/33 14% O2 33% He

Partial pressure fill your cylinders with 1/3 helium then top off with air.
Analyze your oxygen. If it reads 14% then you mixed correctly

No travel gas

Once you hit 30 feet, go onto your 14/33 and stay on it for the dive.

Carry a cylinder of 50% for stops from 70 feet up to 30 feet

100% Oxygen cylinder for 20 and 10 foot stops.

Cut the proper tables or use a VR3 computer + tables for back-up, and go diving

 

[boogeywoogey]

All very well....the problem I have is the filling...

If I would like a trimix of 18/30 and I dont actually get the 18....or the 30....the only thing I have is the 02 to go on.

AS a novice, is that all I need to worry about??

boogey

 

[boogeywoogey]

Please reply in metric NOT PSI....useless piece of measurement...cheers...unike DIN...accept it...


Ok don't but please LETS HEAR REALLY GOOD ARGUMENTS for psi, which do not exist

 

[boogeywoogey]

I always wondered how to end a thread quickly on a US site....and now I know....Merry Christmas....lol.

Boogey

 

[boogeywoogey]

Curt,

When the cylinders arrive on island they are not O2 clean, as in for high mixes. For me that would be, playing safe, 40%...do you have views on that??? That is using a clean compressor...BUT not HYPERAIR/COA.

So, if I can cobble such a mix together...use some dive tables laminated, have a comp...use 32/40% as travel and deco I reckon I could shave at least 30-40 minutes off dive time...interesting as opposed to accelerated deco using much higher O2 mixes...

That has been enlightning......I really do appreciate it.

boogey




Quote:




Originally Posted by boogeywoogey




Can I ask a question for deco divers that dive within air limits (70m),,,

1. What gases do you take for travel, back and deco?

Tell me the variations of the diving because my question is very open.

I am very very intersted to hear experiences.

boogey



Keep it simple

Curt,

My problem, and the problem of any "budding" technical diver in Curacao is the O2 mix in the cylinder.

When the cylinders arrive on island they are not O2 clean, as in for high mixes. For me that would be, playing safe, 40%...do you have views on that??? That is using a clean compressor...BUT not HYPERAIR/COA

Heliair 14/33 14% O2 33% He

Partial pressure fill your cylinders with 1/3 helium then top off with air.
Analyze your oxygen. If it reads 14% then you mixed correctly

No travel gas

Once you hit 30 feet, go onto your 14/33 and stay on it for the dive.

Carry a cylinder of 50% for stops from 70 feet up to 30 feet

100% Oxygen cylinder for 20 and 10 foot stops.

Cut the proper tables or use a VR3 computer + tables for back-up, and go diving
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