Change of diluent?

***diverklondike*** · 18th March 2006, 22:00

Quote: (Originally Posted by Nick uk.)

Aah ok, so it's a logistical decision rather than a technical one?

Actually both... It meets my needs from a flush... END etc point of view for everything I do down to 100m.

M

Nick uk. · 18th March 2006, 22:14

Quote: (Originally Posted by diverklondike)

Actually both... It meets my needs from a flush... END etc point of view for everything I do down to 100m.

M

So, when you re-fill your tanks, would you empty them and have them filled 100bar H then a top up with air each time, or if you had 20/30bar left you would have them taken to 100bar with H then topped off with air and then analize?

As a rule of thumb.....

decoweenie · 19th March 2006, 03:07

Quote: (Originally Posted by Nick uk.)

So, when you re-fill your tanks, would you empty them and have them filled 100bar H then a top up with air each time, or if you had 20/30bar left you would have them taken to 100bar with H then topped off with air and then analize?

As a rule of thumb.....

No, just fill 1/2 of the "difference" (200 bar - 30 bar = 170 bar) with Helium (i.e. to 115 bar) then top off with air.

***diverklondike*** · 19th March 2006, 03:22

Quote: (Originally Posted by decoweenie)

No, just fill 1/2 of the "difference" (200 bar - 30 bar = 170 bar) with Helium (i.e. to 115 bar) then top off with air.

Actually much simplier than that... I have 2 genisis 100's that I have fill with 2000 psi of He and then top with air to 4000 psi.

I then use them to cascade into my dil tanks. I also have a Jetsam booster when the pressure drops.

Dive Safe...

Mark

cedricverdier · 19th March 2006, 04:05

Hi Aldo,

I answered "Sometimes" in your poll as there was no "Never".

I start and finish the dive on the same mix whatever the depth.

Cheers

NickK · 19th March 2006, 04:13

Mark,

What bail out gas and amount of it do you usually have when you do you reg dives on your trimix?

Thanks,
Nick

Drmike · 19th March 2006, 05:14

Quote: (Originally Posted by cedricverdier)

I start and finish the dive on the same mix whatever the depth.

I also do....unless of course I run out of dil/inflation gas at 127m inside a cave!

bubnotbub · 19th March 2006, 07:17

Hi,
Someone can help me and to say me as can I change the pool?

Best

Aldo

decoweenie · 19th March 2006, 07:34

Quote: (Originally Posted by diverklondike)

Actually much simplier than that... I have 2 genisis 100's that I have fill with 2000 psi of He and then top with air to 4000 psi.

I then use them to cascade into my dil tanks. I also have a Jetsam booster when the pressure drops.

Dive Safe...

Mark

I do too, except you still have to top off the reservoir eventually...

**nigelh** · 19th March 2006, 09:28

I never change the DIL.
I will oxygen flush at 6m if I think I have lots of CNS to spare but that depends if it's a weekend trip or a week's trip.

View Poll Results: I change diluent during ascent
every time	4	6.06%
Never	49	74.24%
sometimes	13	19.70%
Voters: 66. You may not vote on this poll

18th March 2006, 22:00	#11 (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: 1,552	Re: Change of diluent? Quote: (Originally Posted by Nick uk.) Aah ok, so it's a logistical decision rather than a technical one? Actually both... It meets my needs from a flush... END etc point of view for everything I do down to 100m. M
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18th March 2006, 22:14	#12 (permalink)
Nick uk. Made in England. Current Rebreather/s: Inspiration Classic Azimuth Other Rebreather/s: Azimuth Join Date: Nov 2005 Location: Viale C.Colombo 75 Marina di Carrara. MS 54036 Italy Posts: 579	Re: Change of diluent? Quote: (Originally Posted by diverklondike) Actually both... It meets my needs from a flush... END etc point of view for everything I do down to 100m. M So, when you re-fill your tanks, would you empty them and have them filled 100bar H then a top up with air each time, or if you had 20/30bar left you would have them taken to 100bar with H then topped off with air and then analize? As a rule of thumb..... __________________ If it aint broke....don't fix it, and if it is.............well......get another one! divechief2000@hotmail.com
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19th March 2006, 03:07	#13 (permalink)
decoweenie Crash Test Dummy Current Rebreather/s: Other CCR Other Rebreather/s: Other CCR Join Date: Feb 2005 Location: Cairo Posts: 5,510	Re: Change of diluent? Quote: (Originally Posted by Nick uk.) So, when you re-fill your tanks, would you empty them and have them filled 100bar H then a top up with air each time, or if you had 20/30bar left you would have them taken to 100bar with H then topped off with air and then analize? As a rule of thumb..... No, just fill 1/2 of the "difference" (200 bar - 30 bar = 170 bar) with Helium (i.e. to 115 bar) then top off with air. __________________ "...after a while you get bored offering advice to a bull that like to keep butting the fence with its head rather than walking through the open gate..." - Rebreather World PM
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19th March 2006, 03:22	#14 (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: 1,552	Re: Change of diluent? Quote: (Originally Posted by decoweenie) No, just fill 1/2 of the "difference" (200 bar - 30 bar = 170 bar) with Helium (i.e. to 115 bar) then top off with air. Actually much simplier than that... I have 2 genisis 100's that I have fill with 2000 psi of He and then top with air to 4000 psi. I then use them to cascade into my dil tanks. I also have a Jetsam booster when the pressure drops. Dive Safe... Mark
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19th March 2006, 04:05	#15 (permalink)
cedricverdier S21 M.I.B. Current Rebreather/s: Evolution Megalodon Other Rebreather/s: Not Bought Yet Inspiration Classic Inspiration Vision Sport Kiss Classic Kiss Join Date: Apr 2005 Location: Worldwide! Posts: 494	Re: Change of diluent? Hi Aldo, I answered "Sometimes" in your poll as there was no "Never". I start and finish the dive on the same mix whatever the depth. Cheers __________________ Cedric Verdier PADI Course Director, ANDI-IANTD-PSAI-TDI-DSAT-DAN-NAUI-CMAS Instructor Trainer Trimix (CCR and OC) and Cave Diving Instructor Trainer www.CedricVerdier.com DIRrebreather member
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19th March 2006, 04:13	#16 (permalink)
NickK New Member Current Rebreather/s: Evolution Other Rebreather/s: Evolution Join Date: Nov 2005 Location: Vancouver Island Posts: 89	Re: Change of diluent? Mark, What bail out gas and amount of it do you usually have when you do you reg dives on your trimix? Thanks, Nick
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19th March 2006, 05:14	#17 (permalink)
Drmike Custom Title Allowed! Current Rebreather/s: MK 15.X Ouroboros Other CCR Home Build Other Rebreather/s: Inspiration Classic Other CCR Home Build Join Date: Feb 2005 Posts: 3,128	Re: Change of diluent? Quote: (Originally Posted by cedricverdier) I start and finish the dive on the same mix whatever the depth. I also do....unless of course I run out of dil/inflation gas at 127m inside a cave! __________________ Get a girlfriend you sad twat - a Rebreather is an unfaithful mistress - dont blind yourself to her faults just because she goes down on you
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19th March 2006, 07:17	#18 (permalink)
bubnotbub Silent diver Current Rebreather/s: Inspiration Classic Inspiration Vision Evolution Megalodon Ouroboros rEvo Other CCR Other Rebreather/s: Inspiration Classic Sport Kiss rEvo Other CCR Join Date: Sep 2005 Location: France Italy Posts: 389	Re: Change of diluent? Hi, Someone can help me and to say me as can I change the pool? Best Aldo __________________ Aldo Ferrucci *Trimix and Rebreather IT* *Expedition Leader* *www.bubnotbub.com* I like bubbles only in my glass of Champagne
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19th March 2006, 07:34	#19 (permalink)
decoweenie Crash Test Dummy Current Rebreather/s: Other CCR Other Rebreather/s: Other CCR Join Date: Feb 2005 Location: Cairo Posts: 5,510	Re: Change of diluent? Quote: (Originally Posted by diverklondike) Actually much simplier than that... I have 2 genisis 100's that I have fill with 2000 psi of He and then top with air to 4000 psi. I then use them to cascade into my dil tanks. I also have a Jetsam booster when the pressure drops. Dive Safe... Mark I do too, except you still have to top off the reservoir eventually... __________________ "...after a while you get bored offering advice to a bull that like to keep butting the fence with its head rather than walking through the open gate..." - Rebreather World PM
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19th March 2006, 09:28	#20 (permalink)
nigelh New Member Current Rebreather/s: Inspiration Vision Other CCR Other Rebreather/s: Inspiration Classic Other CCR Join Date: Mar 2005 Location: Brighton, Sussex, UK Posts: 821	Re: Change of diluent? I never change the DIL. I will oxygen flush at 6m if I think I have lots of CNS to spare but that depends if it's a weekend trip or a week's trip. __________________ nigelh
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