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Old September 10th, 2007, 01:15 PM   #1 (permalink)
Chris Armstrong(Offline)
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Hi All,

I'm planning a dive on the USS Oriskany, Florida in summer and I have come up with a deco schedule. I'd like some comments / criticisms of my schedule ...

45m for 35 mins on air
30m for 15 mins on 32% nitrox
20m for 5 mins on 36% nitrox - deep stop
9m for 5 mins on 36% - deco stop
6m for 20 mins on 36% - deco stop
3m for 5 mins on 36% - deco stop

I've got this profile shape from the BSAC '88 tables when diving air. I've padded it out a bit more with extra deco stop time. AND By using nitox gases that would accelerate off gasing, but sticking with an air deco schedule.

Thoughts people?
 
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Old September 10th, 2007, 01:19 PM   #2 (permalink)
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Quote: (Originally Posted by cancerchris)View Post
I'd like some comments / criticisms of my schedule
...
45m for 35 mins on air
...
Personally I'd avoid this for starters!

Is there a reason for not using trimix for this dive?
 
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Old September 10th, 2007, 01:55 PM   #3 (permalink)
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Quote: (Originally Posted by cancerchris)View Post
AND By using nitox gases that would accelerate off gasing, but sticking with an air deco schedule.

Thoughts people?
We don't use one set of gases and pretend to use another. For this dive we would use trimix (21/35 or 18/45) and nitrox 50 (and maybe oxygen in addition, depending if this 35 min at bottom is really 35 min).
 
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Old September 10th, 2007, 02:08 PM   #4 (permalink)
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Well, my planner gives almost twice the decotime you have planned..
 
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Old September 10th, 2007, 02:36 PM   #5 (permalink)
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Ive just been a volunteer in a chamber doing some test on air for some research (can't give details at present.... not allowed!) but suffice to say it very strongly reinforced my opinion on the need for trimix.

I was unaware of the depth during the tests, but when I saw the results compared to how I performed on the surface......

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Old September 10th, 2007, 02:46 PM   #6 (permalink)
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Quote: (Originally Posted by cancerchris)View Post
Hi All,

I'm planning a dive on the USS Oriskany, Florida in summer and I have come up with a deco schedule. I'd like some comments / criticisms of my schedule ...

45m for 35 mins on air
30m for 15 mins on 32% nitrox
20m for 5 mins on 36% nitrox - deep stop
9m for 5 mins on 36% - deco stop
6m for 20 mins on 36% - deco stop
3m for 5 mins on 36% - deco stop

I've got this profile shape from the BSAC '88 tables when diving air. I've padded it out a bit more with extra deco stop time. AND By using nitox gases that would accelerate off gasing, but sticking with an air deco schedule.

Thoughts people?
Chris
Not sure that the BSAC tables are an appropriate starting point for your own devised schedule. They were written with a specific purpose in mind and whilst better than what we had before '88 - gas theory has moved on a bit in the interim.

For some air wouldn't be the first choice for BG (even BSAC now advocates trimix below 40m).

There's probably little benefit in carrying both 32% and 36% - the difference in deco time is marginal.

Your profile suggests you're a PADI AOW with 30 dives, in which case this dive may be beyond your current training/experience.

keep safe

vid
 
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Old September 10th, 2007, 03:01 PM   #7 (permalink)
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If I were you Iīd take Oxygen with you as well. LOTS!

Seriously though, your choice of gasses is.. erm, how can I put it... errr....interesting! yes, thatīs it interesting!
You really should get a lot more experience and training before even thinking so far ahead.
Itīs good to have a goal though, best of luck with it! :-)
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Old September 10th, 2007, 03:40 PM   #8 (permalink)
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yes with that profile I would bring a lot of oxygen...
but hitting the nail on the head..get some training..this is an offshore dive and this kind of profile is not at your current "training" level.

If you were deco trained..this would still be an awful profile..and will most likely leave you feeling like you have the flu.
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Old September 10th, 2007, 06:27 PM   #9 (permalink)
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This is a scary profile. Have you been trained for deco diving? I wouldn't do the profile that you prescribed at all.
 
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Old September 10th, 2007, 06:46 PM   #10 (permalink)
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Although i'm pretty much a tenderfoot in deco-country.

GAP predicts trouble when diving a schedule like this one.

Using the gasses like you planned, GAP gives an additional 25 minutes on O2@3meters.

And this is using Buhlman ZH-L16-b GF20/70 (info for what its worth, if my info stinks, plz tell me)
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