Helair fill

Simon Ciantar · 8th July 2006, 15:40

Hi guys

would appreciate some urgent help for my dive tomorrow.

I have been to my dive shop to fill a helair fill 12/43. This I usually do by filling 100 Bar Helium and top off to 230 bar air. However due to the dive shop being out of helium I was forced to leave it there , and found it ready the following day however, when I checked the o2 it gave me 11 % O2 , The guy at the dive shop made used some sort of programme and came up with 47 % for helium but then said that this is a programme for trimix fills not helair, does anybody know how i can calculate the helium ?

***EBT*** · 8th July 2006, 15:48

(Fill pressure-((FO2 x Fill Pressure)/.21))/fill pressure.

Comes out as ~47% at 230 bar.

PS. This is pretty basic stuff, just do it from first principles.

Simon Ciantar · 8th July 2006, 16:29

hi thks

yes your right its pretty basic .. guess i panicked

thks

anyway

Simon

***diverklondike*** · 9th July 2006, 13:03

Here is an excellent reference for helair mixing etc...

http://www.advanceddivermagazine.com/GasStationPage.htm

8th July 2006, 15:40	#1 (permalink)
Simon Ciantar New Member Current Rebreather/s: Inspiration Classic Other Rebreather/s: Join Date: May 2005 Location: Malta Posts: 38	Helair fill Hi guys would appreciate some urgent help for my dive tomorrow. I have been to my dive shop to fill a helair fill 12/43. This I usually do by filling 100 Bar Helium and top off to 230 bar air. However due to the dive shop being out of helium I was forced to leave it there , and found it ready the following day however, when I checked the o2 it gave me 11 % O2 , The guy at the dive shop made used some sort of programme and came up with 47 % for helium but then said that this is a programme for trimix fills not helair, does anybody know how i can calculate the helium ?
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8th July 2006, 15:48	#2 (permalink)
*EBT* Apprentice Luddite Current Rebreather/s: Classic Kiss Other Rebreather/s: Inspiration Classic Join Date: Feb 2005 Location: UK, Brighton Posts: 1,836	Re: Helair fill (Fill pressure-((FO2 x Fill Pressure)/.21))/fill pressure. Comes out as ~47% at 230 bar. PS. This is pretty basic stuff, just do it from first principles. __________________ Eagles May Soar, but weasels don't get sucked into jet engines! Rebreather World Terms of service Real diving t-shirts for real divers Last edited by EBT : 8th July 2006 at 15:51.
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8th July 2006, 16:29	#3 (permalink)
Simon Ciantar New Member Current Rebreather/s: Inspiration Classic Other Rebreather/s: Join Date: May 2005 Location: Malta Posts: 38	Re: Helair fill hi thks yes your right its pretty basic .. guess i panicked thks anyway Simon
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9th July 2006, 13:03	#4 (permalink)
*diverklondike* Moderator Current Rebreather/s: Inspiration Classic Other CCR Other Rebreather/s: Inspiration Classic Other CCR Join Date: Oct 2005 Location: Delaware, USA Posts: 1,439	Re: Helair fill Here is an excellent reference for helair mixing etc... http://www.advanceddivermagazine.com/GasStationPage.htm
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