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Tek-Talk: Discuss Helium Question in the Technical and Specialist Diving Forums forums: Simple question, I hope. Need two answers... How many fills of 45 bar-ish in a set of twin 12s ...

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Old 09-04-07, 07:18 PM
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Helium Question
Simple question, I hope. Need two answers...

How many fills of 45 bar-ish in a set of twin 12s could I get from a single J of helium without, and then with a booster. Forget cascading or anything else, just curious about a single cylinder.

Cheers

G
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Old 09-04-07, 07:26 PM
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Mark Chase Mark Chase is offline
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50ltr 300bar HE J about 10-11 fills, Id cost on 10.

With a booster?? thats not particularly rlevent as by the time the J gets down to 50 bar its not worth boosting. However asuming a limitles supply of cheep drive gas, then about two more fills.

Booster comes in for tops and possably 02. You dont want to run He through the booster if you can help it.

ATB

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Old 09-04-07, 07:27 PM
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45bar * 2x12 = 1080 ltrs means a 23 bar drop in the J (X47) so

assume starting at 200bar
1/ 200 - 23 = 177
2/ 177 - 23 = 154
3/ 154 - 23 = 131
4 / 131 - 23 = 108
5/ 108 - 23 = 85
6/ 85 - 23 = 62

now you can't put 45 bar in the 12s 'cos there not enough pressure in the J.
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Old 09-04-07, 07:29 PM
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by my reckoning with a booster pump :-
you have a 50L "J" @ 200bar = 10000L of gas
twin 12 @ 45bar =24x 45 = 1080L of gas for each fill
therefore 10000 divided by 1080 = 9.25 fills .
I think thats right if not then I would be interested to know the correct workings !
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Old 09-04-07, 07:40 PM
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Quote:
Originally Posted by Garf
Simple question, I hope. Need two answers...

How many fills of 45 bar-ish in a set of twin 12s could I get from a single J of helium without, and then with a booster. Forget cascading or anything else, just curious about a single cylinder.

Cheers

G


Do you meen 45 bar or do you meen a fill for 18/45? Coz I think thats about 105bar of He if you do. In which case its about 4 fills and a booster will get 5

ATB

Mark Chase
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Mark, dispite the fact your a Heron shagging tosser I agree with you , Steve S 10/04/08
ATB as most people will tell you, means Always Talking Boll@cks. My responses to threads should be treated accordingly
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Old 09-04-07, 07:46 PM
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cheers mark, you are spot on, my mistake

Thanks for the info everyone.
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Old 09-04-07, 08:09 PM
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Quote:
Originally Posted by Mark Chase
You dont want to run He through the booster if you can help it.

ATB

Mark Chase
Mark, why would this be a problem / waste of time?
Cheers
Richard
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Old 09-04-07, 08:41 PM
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Quote:
Originally Posted by Garf
cheers mark, you are spot on, my mistake

Thanks for the info everyone.
Ah . . . . that makes a difference. Without a booster you'll only get two fills out of a X47 J @ 200bar, unless you cascade.


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Old 09-04-07, 09:04 PM
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Quote:
Originally Posted by Mark Chase
Booster comes in for tops and possably 02. You dont want to run He through the booster if you can help it.
Huh?
I boost everything so I always dive on full.

Even argon into the suit bottle.
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Old 09-04-07, 09:50 PM
IanMc IanMc is offline
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I got 3 * 21/35 fills out a J and the last one was slighty weak when i did it last year. So you would only get 2 18/45 fills without cascading.

Ian
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