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Question 12lt tank transfer to 3 lt tank

Discussion in 'Anything Airgun Related' started by chrisclow, Oct 9, 2014.

  1. chrisclow

    chrisclow Engaging Member

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    Hi I have a heavy 12lt air tank , is it possible to use the 12lt tank to fill a 3lt tank .so I could use the 3lt to fill my gun instead of carting the big 12lt to the range.
     
  2. harry brown

    harry brown Banned BANNED

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    Last edited: Oct 9, 2014
  3. DaveF

    DaveF Busy Member

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    The decanting hoses are expensive and you won't fill the 3L bottle to 300 bar many times from the 12L tank - not sure how many possibly only twice i m sure a maths genius will be along to tell you

    Atb

    Dave
     
  4. chrisclow

    chrisclow Engaging Member

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    Oh thanks for that Dave, looks like its back to the 12lt :(
     
  5. harry brown

    harry brown Banned BANNED

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    Never was good at maths...But happily used mine to do it for many fills. Too much over thinking things like this ain't healthy..
     
  6. Clubshot

    Clubshot Clubshot

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    I have AA Universal Females On All my bottles

    Just add another AA Male to decant

    Originally started as could Only have 200 Bar in my 3 Litre for Ram Charger - when Charging TAC's

    With Air Guns you are only using top end of bottle not draining All air each Fill

    Reason I have words when refilled - Divers need a Full Tank - Air Gunners Only need topping up ......

    BOB/R
     
  7. Jesterdog

    Jesterdog Donator

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    Chill the 3ltr prior to, and stand in cold water during, the decant .......... keep 12ltr in a warm room prior to decant
    Pressure = temperature x volume

    I do the same when refilling my gas lighter -the difference is quite marked
     
  8. Kenbarcon

    Kenbarcon Donator

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    Its not just a case of how many times you can fill your 3ltr bottle, its how many times can you fill your rifle from a 3ltr bottle thats whats more important.
    What rifle are you wanting to fill?
    For example if it was a AA410 working at 190 bar fill and refill when at 80 bar you would get 14 fills from a 3ltr 300bar bottle, if you only get 2 fills of your 3ltr bottle from your 12 ltr bottle then thats 28 rifle fills.

    Use this calculator, play around with it and see if its worth it. http://airgun-hq.co.uk/airgunhq/Tools/Calculators/tabid/54/Default.aspx

    I fill my 3ltr 232 bar bottle from my 12ltr 300bar bottle and get 4 fills, this then gives me 4 fills on my rifle which is at least 500 shots, plenty for me. This also leaves me several fills available from my 12ltr bottle after.
     
  9. chrisclow

    chrisclow Engaging Member

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    Err I have a hw100 so 200bar fill.is it the first fill of the 3lt that takes the big hit , then am I right in saying the next lot of refills would take a lot less to fill, and give more top up fills
     
  10. Kenbarcon

    Kenbarcon Donator

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    Thats the way it goes.
     
  11. terry1001

    terry1001 Major Poster

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    You won't be able to fill the 3l bottle to 300 bar from a 12l 300 bar tank, it's likely to be about 240 bar if the 3l one was empty. After that you're only topping up so won't use as much air from the larger bottle. The maximum pressure in your 3l bottle will still allow you to get quite a few fills up to 200 bar so it's feasible to do this. You will waste any air that is in the hose you use to connect the two plus you than lose the air in the hose as you fill the rifle but the convenience should offset that.
    I have a carbon fibre tank which is light and no problem to put into the boot of my car, I'm never likely to shoot a rifle out of air when away from the car.
     
  12. Dag

    Dag Pro Poster

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    Very nice tool to use but bear in mind anyone who needs to look for the number of fills from a 4litre bottle that they need to use the second set given for 3 litres as there is a typo.
    hth
    Dag
     
  13. chrisclow

    chrisclow Engaging Member

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    Hi dag , it might be me but I didn't understand a word of what you said :confused:
     
  14. sej016

    sej016 Donator

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    You only ever get half the use out of a bottle, be it 12, 7 or 3 ltr.

    That's because you can fill them to 300Bar, but they are no use once they get to about 170/180 bar. You have to top them up again.

    Filling a completely empty 12ltr tank to 300Bar takes ages, and you never get 300Bar in the first fill.

    The faster you fill it, the hotter it gets - when it cools you'll lose anything between 20 to 30 Bar, sometimes more.

    Someone filling it properly will let it cool down (carbon fibre tanks take ages to cool) and then top it up.

    I would not try filling a 3ltr tank from a 12ltr tank from scratch. I would get the 3ltr properly filled first, and then just top it up from the 12ltr.
     
    Last edited: Oct 9, 2014
  15. terry1001

    terry1001 Major Poster

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    You don't have to stop using a bottle just because it's dropped to you normal fill pressure, you can still fill to 160, 150 etc but you'll not get as many shots. It will keep you going until you can get a refill.
     
  16. chrisclow

    chrisclow Engaging Member

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    Thanks for the replies , dose any one know roughly how many fills I would lose by decanting from the 12 litre to the 3 litre. On the
    Conversion table i can get about 97 refills (topping gun up from 100bar to 200bar) from the 12 litre.
     
  17. Kenbarcon

    Kenbarcon Donator

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    As someone said before, get the 3 ltr filled by the shop and just keep topping it up from the 12ltr, will give you loads of fills.
     

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