130's as a dil bank....

netmage · 2nd November 2007, 14:53

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.

babar · 2nd November 2007, 15:25

I use mine as a bank for my booster. Lasts a long time, Plus if you don't run the booster with a compresor, you can use it to run the booster and supply gas.

without a booster, you can close the isolater valve and have a 2 bottle cascade.

**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

**hoppyinca** · 3rd November 2007, 03:07

they work great...

I was able to borrow a set of HP 120's when I was in San Diego last month, those rEvo divers out there are pretty nice guys...

any way several l fills, and still returned the set with mucho gas left!

thanks eric!

hoppy

doug allen · 5th November 2007, 02:04

A dill bank....dang....I use my 120 as a bail out.....

Instuctor said to get rid of that heavy look stuff......wtf

Curt Bowen · 5th November 2007, 02:56

I do this normally

Since I use TX 10/50 most of the time as a diluent

I buy a 315 cuft bank helium cylinder, normally filled to around 2400 psi.

transfill 2 LP 121's to 1500 psi HE, top off to 3000 with air making 10/50 in cylinders.

This normally drops the large 315 cuft bank to around 1200 psi. Then I take the large HE bank cylinder and top it off to double the HE pressure with air to make a large bank of 10/50.

I use a couple 80's to drive my baby booster if I need to bump up the pressures in my CCR dil.

2nd November 2007, 14:53	#1 (permalink)
netmage Hello Kitty...... Current Rebreather/s: Megalodon Other Rebreather/s: Join Date: Dec 2005 Location: Coconut Creek, FL Posts: 351	130's as a dil bank.... 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.
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2nd November 2007, 15:25	#2 (permalink)
babar Curmudgeon Current Rebreather/s: Evolution Sport Kiss Other CCR Other Rebreather/s: Inspiration Classic Inspiration Vision Evolution Other CCR Join Date: Apr 2005 Location: Southern California Posts: 416	Re: 130's as a dil bank.... I use mine as a bank for my booster. Lasts a long time, Plus if you don't run the booster with a compresor, you can use it to run the booster and supply gas. without a booster, you can close the isolater valve and have a 2 bottle cascade. __________________ Babar Evolution Plus Sport kiss
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2nd November 2007, 15:36	#3 (permalink)
PhilSiswick WSKD 0001 Current Rebreather/s: Evolution Other Rebreather/s: Inspiration Vision Join Date: Apr 2006 Location: Oxford, UK Posts: 884	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 No comment on open circuit... it's an evolutionary dead end not really worth discussing here. Dave Sutton, 2007 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 www.hugsac.org.uk
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3rd November 2007, 03:07	#4 (permalink)
hoppyinca New Member Current Rebreather/s: MK 15.X Other Rebreather/s: Join Date: Jun 2005 Location: Laguna Niguel, CA USA Posts: 250	Re: 130's as a dil bank.... they work great... I was able to borrow a set of HP 120's when I was in San Diego last month, those rEvo divers out there are pretty nice guys... any way several l fills, and still returned the set with mucho gas left! thanks eric! hoppy
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5th November 2007, 02:04	#5 (permalink)
doug allen New Member Current Rebreather/s: Optima Other Rebreather/s: Optima Join Date: Sep 2007 Location: Asheboro, NC Posts: 24	Re: 130's as a dil bank.... A dill bank....dang....I use my 120 as a bail out..... Instuctor said to get rid of that heavy look stuff......wtf
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5th November 2007, 02:56	#6 (permalink)
Curt Bowen RebreatherWorld Sponsor Current Rebreather/s: Classic Kiss Other Rebreather/s: Megalodon Sport Kiss Join Date: Jun 2005 Location: USA, Florida Posts: 245	Re: 130's as a dil bank.... I do this normally Since I use TX 10/50 most of the time as a diluent I buy a 315 cuft bank helium cylinder, normally filled to around 2400 psi. transfill 2 LP 121's to 1500 psi HE, top off to 3000 with air making 10/50 in cylinders. This normally drops the large 315 cuft bank to around 1200 psi. Then I take the large HE bank cylinder and top it off to double the HE pressure with air to make a large bank of 10/50. I use a couple 80's to drive my baby booster if I need to bump up the pressures in my CCR dil. __________________
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