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DIR: Discuss DIR Standard Gases in the Technical and Specialist Diving Forums forums: 21/35, 18/45 etc. - Can anyone explain to me how they were actually arrived at? Thanks Robert...

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Old 28-07-04, 09:34 AM
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Question DIR Standard Gases
21/35, 18/45 etc. - Can anyone explain to me how they were actually arrived at?

Thanks

Robert
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Old 28-07-04, 10:33 AM
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standard gases?
Standard gases cover a range of depths right up to 120m with some overlap. Important thing is to keep the PO2 low and the He high to keep the END below 30m.

Where continuous blending is available or DNAx (like in Florida for example) it is very easy to prepare these standard mixes as follows:

21/35 = 81bar He + top off with 32%
18/45 = 103bar He + top off with 32%
15/55 = 126bar He + top off with 32%
etc....

So where you have banked 32% it is incredibly quick and easy to prepare gas and you don't have all the hassle of so called "O2 cleaning".

Hope this helps

Bob
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Old 28-07-04, 11:01 AM
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Quote:
Hope this helps
Perfectly!

Thanks Bob.
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Old 28-07-04, 11:03 AM
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Quote:
Where continuous blending is available or DNAx (like in Florida for example) it is very easy to prepare these standard mixes as follows:

21/35 = 81bar He + top off with 32%
18/45 = 103bar He + top off with 32%
15/55 = 126bar He + top off with 32%
etc....

Very usefull info thanks Bob

ATB

Mark Chase
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Old 28-07-04, 02:34 PM
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More Piracy!!!!!
I hate to be a DIR cynic but, well, I am

The standard gases were yet another thing pinched from elsewhere and badged "DIR". The concept of a range of gases based on banked EAN32 was invented by Billy Deans at Key West Diver maaaaaany moons ago. As Cap'n Billy taught GI3 how to dive (I am struggling to not add "without looking like a tw@t") I think I can guess how it ended up becoming DIR.

KWD had a massive EAN32/36 bank (IIRC they came from a scrap submarine) and all their standard gases were based around it. Brilliant place, shame it's gone.
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Old 28-07-04, 03:18 PM
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Oi Stuart....
Stop DIR bashing and read my bit about E France in the DIR forum. Anything you want to add?

Bob
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Old 28-07-04, 04:17 PM
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Quote:
Originally Posted by NotDeadYet
I hate to be a DIR cynic but, well, I am

The standard gases were yet another thing pinched from elsewhere and badged "DIR". The concept of a range of gases based on banked EAN32 was invented by Billy Deans at Key West Diver maaaaaany moons ago. As Cap'n Billy taught GI3 how to dive (I am struggling to not add "without looking like a tw@t") I think I can guess how it ended up becoming DIR.

KWD had a massive EAN32/36 bank (IIRC they came from a scrap submarine) and all their standard gases were based around it. Brilliant place, shame it's gone.
I also had the pleasure to dive with Billy and his dudes. I did my IANTD courses there....
DIR did also not invent the manifold or other things BUT they pushed the use of these things, which is at least as usefula as an invention IMHO

Michael (who did the Curb and Wilkes with Billy)
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Old 29-07-04, 01:40 PM
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I did my IANTD training with someone who had been a good mate of Billy Deans so ended up diving there a lot. The Wilkes-Barre was a magnificent wreck, Key West Diver was probably the best dive shop ever and Billy Deans one of the best divers I ever been in the water with.

Sad that it's all gone now.
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