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**PhilSiswick** · 2nd November 2007, 15:36

Quote: (Originally Posted by netmage)

Looking at making the transition, is there any practical value in retaining a set of 130's as a diluent bank...?

Started running through the transfill calculations, and it appears using 3L bottles, you might only get 3-4 fills before the supply drops into the 2200psi range.

I use a 15l (no idea what that is in cu ft :-( for dil. I did the same calculations as you and wondered whether it would be worth using as a sort of bank. Tried it anyway and the upshot is yes. What I didn't think about, cos I'm new at this game, is that you don't drain your cylinders like you did on OC (or at least you won't once you've got a bit of experience).

I used my 15 filled with 21/35 last week in Scapa. Started with 210 bar. I never needed to top my dil bottle up from less than 140 bar, so after 4 tops, I was still at 160 bar or so. I'd have been happy to carry on and take it down to 120 or 130 bar, which would have given me another 4 or 5 tops, as I was only using 30-50 bar on each dive.

HTH,

Phil

2nd November 2007, 15:36	#3 (permalink)
PhilSiswick Phil Siswick, Tango Current Rebreather/s: Evolution Other Rebreather/s: Inspiration Vision Join Date: Apr 2006 Location: Oxford, UK Posts: 995	Re: 130's as a dil bank.... Quote: (Originally Posted by netmage) Looking at making the transition, is there any practical value in retaining a set of 130's as a diluent bank...? Started running through the transfill calculations, and it appears using 3L bottles, you might only get 3-4 fills before the supply drops into the 2200psi range. I use a 15l (no idea what that is in cu ft :-( for dil. I did the same calculations as you and wondered whether it would be worth using as a sort of bank. Tried it anyway and the upshot is yes. What I didn't think about, cos I'm new at this game, is that you don't drain your cylinders like you did on OC (or at least you won't once you've got a bit of experience). I used my 15 filled with 21/35 last week in Scapa. Started with 210 bar. I never needed to top my dil bottle up from less than 140 bar, so after 4 tops, I was still at 160 bar or so. I'd have been happy to carry on and take it down to 120 or 130 bar, which would have given me another 4 or 5 tops, as I was only using 30-50 bar on each dive. HTH, Phil __________________ Phil (WSKD 0001) I have always felt that the dive I am on is not nearly important as the dives I plan to be on the rest of my life. Tom Rose, 2007 The person who gets the farthest is generally the one who is willing to do and dare. The sure thing boat never gets far from shore. Charles A. Lindbergh www.hugsac.org.uk
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