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gallathan · 10th September 2007, 10:43

In the interest of streamlining, avoiding bad trim / tanks stirring silt, I'm interested in rules of thumb for how much Helium is needed in a stage to make it float. Here in the UK, seems an ALI80 / ali tanks need about 30 to 35% Helium to make them float, and at the weekend my buddy had a steel 232 bar 12ltr that had a floating tail with 60% helium in it. It was noticable too that with 10 bar less (i.e. 200 -> 190) bar, the tail cam up a lot. So wondering what the %He vs reducing pressure in the tank trade off is.

10th September 2007, 10:43	#1 (permalink)
gallathan New Member Current Rebreather/s: Inspiration Vision Other Rebreather/s: Join Date: Mar 2006 Location: Laleham, Middlesex, England, UK Posts: 52	% Helium in stages to make them float In the interest of streamlining, avoiding bad trim / tanks stirring silt, I'm interested in rules of thumb for how much Helium is needed in a stage to make it float. Here in the UK, seems an ALI80 / ali tanks need about 30 to 35% Helium to make them float, and at the weekend my buddy had a steel 232 bar 12ltr that had a floating tail with 60% helium in it. It was noticable too that with 10 bar less (i.e. 200 -> 190) bar, the tail cam up a lot. So wondering what the %He vs reducing pressure in the tank trade off is.
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