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Diving Physics: Discuss planning multi-level dive calcs in the Training Area forums: Hi There Can anyone offer any feedback on how to calculate the following? If I’m planning a multi-level ...

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Old 17-03-08, 06:23 PM
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Cool planning multi-level dive calcs
Hi There

Can anyone offer any feedback on how to calculate the following?

If I’m planning a multi-level dive

My first dive is 29 Mtrs for 20 mins

What is the no decompression limit for my deepest next level permitted.

Any advice would be most appreciated


Cheers
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Old 17-03-08, 06:38 PM
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Clare Gledhill Clare Gledhill is offline
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Depends on what schedule you are running and what your surface interval is.

Are you looking for an exam answer for PADI/BSAC?
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Old 17-03-08, 06:39 PM
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I make it to be 12 minutes at 20m.
Based on PADI Wheel.
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Last edited by Frankie Price : 17-03-08 at 06:41 PM.
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Old 17-03-08, 07:39 PM
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Quote:
Originally Posted by geoffc
Hi There

Can anyone offer any feedback on how to calculate the following?

If I’m planning a multi-level dive

My first dive is 29 Mtrs for 20 mins

What is the no decompression limit for my deepest next level permitted.

Any advice would be most appreciated


Cheers
More important questions should be

What gas are you on

How much gas have you got?

Whats your SAC?


Just to put you in the picture, using my normal GF deco prifiles I use for OC diving I would be doing 5 mins deco with 1@12 and 1@9m 4@6 folowing 20mins at 29 on air.

If I did a further 12mins at 20m Id be doing 9mins of deco 1@12 1@9 6@6


So if you trying to plan a multi level deco dive on tables id use diferent tables. PADI ones are not all soft and squishy as some people might think.

If your trying to answer a PADI theoretical question then thats a difernet matter.

If not get nitrox 36% and you can do 30 at 29 and 20 at 20 and still have no deco.

ATB

Mark
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Old 17-03-08, 11:21 PM
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On air and OC I allow myself 10min at 30m, 10m at 20m and unlimited time at 10m. For Scottish shore dives it's always a very similar profile and those figures work whatever. I'm sure I should probably be more scientific but I found that most profiles were averaging out not too far from that.
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Old 19-03-08, 11:44 AM
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Quote:
Originally Posted by Clare Gledhill
Depends on what schedule you are running and what your surface interval is.

Are you looking for an exam answer for PADI/BSAC?
Hi Clare

Thanks for reply its a PADI question
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Old 20-03-08, 02:24 PM
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The use of the term "no decompression limit" strongly hint at a PADI question...probably one relating to the Wheel (tm).

Assuming this is a first dive....calculate the Pressure Group from the first level and then move to the next level (indicated at the inner of the wheel). Starting from that pressure group, follow the depth curve downwards and identify the NDL from the where the curve ends at the NDL mark/outer time ring intersection.
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