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Specialist DIR Kit OK this is the home of the Gavin - but questions and observations about other scooters, lights, video housing, RB80 etc. can find a home here.
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January 18th, 2008, 07:00 PM
| #1 (permalink) |
| New Member  Join Date: Nov 2005 Location: Suffolk, UK
Posts: 703
   | Hi I am planning to create my own helium bank. My plan is to cascade fill the He from 50ltr J's into my D12s ... aiming for 100 bar of He to then top off with O2/Air as appropriate. I think I am going to need three J's to create an effective cascade system. In confirming my cost calculation etc, I am trying to create a spreadsheet showing how many fills I will be able to get from the 3 J's.....I could do it long hand but just wondered if ayone had already done this and could save me the time by sharing theirs, please? Thanks Mal
__________________ Opinions and beliefs are correct at the time of posting but are subject to change without any notice or obligation on the part of the author. |
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January 18th, 2008, 07:11 PM
| #2 (permalink) |
| Moderator  Join Date: Nov 2005 Location: Fleet, Hants
Posts: 2,692
| Email sent Mal.
__________________ Gareth Images of Life Photography DIR Team Foxturd Travels Underwater and Further Afar “Set your expectations high; find men and women whose integrity and values you respect; get their agreement on a course of action; and give them your ultimate trust.” “It is far better to be trusted and respected that it is to be liked.” |
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January 18th, 2008, 10:11 PM
| #3 (permalink) |
| New Member  Join Date: Dec 2007 Location: Peoples Republic of Walsall
Posts: 72
| You may want to see if you can share the cost of the Helium as 3 J's may be quite pricey, and you may waste a fair bit without a booster. Quote: (Originally Posted by Mal Bridgeman)  Hi I am planning to create my own helium bank. My plan is to cascade fill the He from 50ltr J's into my D12s ... aiming for 100 bar of He to then top off with O2/Air as appropriate. I think I am going to need three J's to create an effective cascade system. In confirming my cost calculation etc, I am trying to create a spreadsheet showing how many fills I will be able to get from the 3 J's.....I could do it long hand but just wondered if ayone had already done this and could save me the time by sharing theirs, please? Thanks Mal |
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January 18th, 2008, 11:13 PM
| #4 (permalink) |
| New Member Join Date: Nov 2005 Location: Suffolk, UK
Posts: 703
| Quote: (Originally Posted by Moray Brown) You may want to see if you can share the cost of the Helium as 3 J's may be quite pricey, and you may waste a fair bit without a booster. Hi Moray, Small world, eh?  The guy I plan to get the helium from will refill the J's and only charge for the He he puts in, so minimising wastage. I am working through a spreadsheet at the moment but I need to find a trade off point between minimising the trips to get fills vs the worthiness of decanting when there's say less than 50 bar in the J. Thanks for the advice Mal
__________________ Opinions and beliefs are correct at the time of posting but are subject to change without any notice or obligation on the part of the author. |
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January 19th, 2008, 01:05 AM
| #5 (permalink) |
| GUE instructor  Join Date: Nov 2005 Location: Asia
Posts: 977
| Quote: (Originally Posted by Mal Bridgeman) Hi Moray, Without a booster this is a real pain in the ass. Better buy one or two and save up for a booster or dive stages so you are filling from scratch or buy a small compressor and run you Helium mixes through that - will alllow you to fill air too Small world, eh? The guy I plan to get the helium from will refill the J's and only charge for the He he puts in, so minimising wastage. I am working through a spreadsheet at the moment but I need to find a trade off point between minimising the trips to get fills vs the worthiness of decanting when there's say less than 50 bar in the J. Thanks for the advice Mal Its pretty hard to save money out of this type of endevour, especially as a single user, so it depends how much you value convenience Graham
__________________ DIN caps and plugs with free world wide postage: www.dustcap.halcyon-hk.com |
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January 19th, 2008, 07:01 AM
| #6 (permalink) |
| wet behind the ears  Join Date: Nov 2005 Location: Seattle, WA
Posts: 976
 | 3 Js is about the minimum. The problem is when you return from a dive with ~80+ bar. Its a serious hit to dump and waste that gas to refill. And its hard to top that up by transfilling. A compressor would allow you to continuous blend and use one supply cylinder completely. Well to 1 or 2 bar at least. Richard |
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January 19th, 2008, 08:26 AM
| #7 (permalink) |
| New Member Join Date: Nov 2005 Location: Suffolk, UK
Posts: 703
| Quote: (Originally Posted by graham_hk) Without a booster this is a real pain in the ass. Hi GrahamPITA is relative :D My current situation is either a 120 mile round trip on day 1 to drop cylinders in for a fill, followed by another 120 mile round trip on day 2 to collect said cylinders......or rely on other people to get fills for me which is a PITA for them. 3 J's in a cascade will be much much more convenient and probably cheaper, all things considered .... even if I have to blow off the remainder. Maybe I'll get hooked and create an envious home set up like Andre in France  Mal
__________________ Opinions and beliefs are correct at the time of posting but are subject to change without any notice or obligation on the part of the author. |
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January 19th, 2008, 08:38 AM
| #8 (permalink) |
| Sister of Darkness  Join Date: Sep 2006 Location: North West
Posts: 1,909
| Quote: (Originally Posted by Mal Bridgeman) Hi Graham I wish I was trimix qualified I would feel so smug knowing that I could travel less than 20 miles and have a coffee while they fill my set - actually there is also someone with 10 miles as well but he doesn't sell as much kit and you never know what you need while having that coffee PITA is relative :D My current situation is either a 120 mile round trip on day 1 to drop cylinders in for a fill, followed by another 120 mile round trip on day 2 to collect said cylinders Mal  I just don't understand when shops don't do this, I understand the time it takes I have seen enough done.
__________________ Fiona It is impossible to make everything foolproof because fools are so ingenious. GUE Member DIVELIFE for everything you need and more |
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January 19th, 2008, 09:14 AM
| #9 (permalink) |
| New Member  Join Date: Jan 2008 Location: Viareggio, Italy
Posts: 11
| hello guy, in my town is very expencive the fill. We have buy a compressor and blend in cascade He and Ox. When i finish the dive and i have 80+bar, I fill to air or nitrow (if i have height the Ox pressure) , and used the set for small dive or for skill. Andrea |
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