Decanting air

Discussion in 'General Airgun Chat' started by DeanB, May 27, 2011.

  1. DeanB

    DeanB Member

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    Just got a 12 litre bottle and would like to decant air into a 3 litre bottle. Both bottles have MDE valve, guage and bleed. Is it just a case of connecting the bottles together, slowly opening one valve, and then slowly opening the other valve and leaving for pressures to equilibrate? Then close valves and open bleeds.

    Advice appreciated.

    Dean
     
  2. raygun

    raygun Non member

    That's about it.

    Don't forget to close both valves before bleeding the line.

    ATB
    Ray.
     
  3. rick

    rick Member

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    Connect them together open both valves and allow the pressure to equalize. It all depends on what fittings you have to connect your bottle to your gun. I use Airarms quick fill and used to have a male fitting attached to the 12lt bottle where you would attach the hose. Because I now have a lead and quick fill for each bottle I have made up a fitting with 2 male connectors to simply connect both hoses together.
     
  4. DaveRobinson

    DaveRobinson NEFTA Chairman

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    Can i suggest perhaps having a quick connector with the one way ball valve left in then prob be safer?
     
  5. DeanB

    DeanB Member

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    Decanting

    Thanks for the responses.

    Dave - are you saying it may be safer to use just one quick fill?

    Dean
     
  6. Jon

    Jon Member

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    3ltr wouldnt happen to be 232bar?
     
  7. Delphinus

    Delphinus New Member

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    The working pressure of the receiver can be any, the rule is never over fill and fill slowly.
     
  8. RobF

    RobF Administrator Staff Member

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    if you're going to 300 to 300, how many fills do you reckon you'll get if you refil the 3l at say 200 bar?

    just wondering cos my local filler is now doing 3L for the same price as 12L for 300's... £5... wondering about the economics as I have a spare 3L to sell perhaps...
     
  9. Delphinus

    Delphinus New Member

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    The work involved is to fill each is the same and start a compressor costs but the same price is to much over here my filler charges by cubic feet, that means that it could cost £1.25.
     
  10. DeanB

    DeanB Member

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    Decanting

    Removed the quick fill fittings for first time try. Joined 12 and 3 litre bottles. Planned for a slow decant. It took 18 minutes for the 3 litre bottle to get to 260 bar. Not used a slow fill MDE valve before - they're definitely slow.

    Thanks for advice. Will probably go through the quick fills next time.

    Dean
     
  11. RobF

    RobF Administrator Staff Member

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    Is it easy to take the slow fill out of the MDE? We have one in one of ours... it's good cos you can throw it wide open and not overfill, but it's difficult to tell when the bottle is getting down near to 200...
     
  12. Delphinus

    Delphinus New Member

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    I wish I had a slow fill valve, it's safer for your 3lt bottle and you end up with higher pressure after the tank cool.
     
  13. DeanB

    DeanB Member

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    Decanting

    Probably should have made it clear - next time, I'll still use the MDE slow fill valve but using the quick-release connections to the join the tanks.

    Dean
     
  14. Jon

    Jon Member

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    Hence why asked is the bottle 232bar, still unanswered and negates all previous replies!
    This then poses a problem of the QR fittings, what they rated at?
    I can tell you what an off the shelf steel 1/8"BSP stud will go and it aint a suitable pressure above 300 bar.
     
  15. DeanB

    DeanB Member

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    Decanting

    Jon,

    Both bottles are 300 bar. Do you suggest a preferred method for decanting. I seethat Best Fittings sell something for £75 (if I rememner right).

    Dean
     
  16. airborn68

    airborn68 Member

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    Hi

    I intend to do the same decant from my 12l to the 3l.
    Both have hoses fitted with the quick couplers, I was just going to purchase 2 more male couplings & a male/male coupling, so you end up with a male - male adaptor a lot cheaper than a dedicated decanting hose.

    Jon
     
    Last edited: May 30, 2011
  17. Jon

    Jon Member

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    Fine Dean, i decant in to a 3ltr or 10.4ltr 232bar from 12ltr 300 bar, scary nice and slow wait for it to filter through.

    All MDE DIN fittings two hoses one has the conventional widely used quick fill female coupler the other an A or O type coupler, could never remember. For the decant i use the hose and nipple rated at over 300BAR without the valve, screwed in to the DIN on 300BAR bottle.
    Fairly sure but check the widely used type in steel are not rated for use at 300BAR, brass even less and vary between manufacturers of these fittings.
     
  18. DeanB

    DeanB Member

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    Decanting

    Airborn68 - I was going down that route but thought I'd hear from the other Jon first.

    Cheers.

    Dean
     
  19. Jon

    Jon Member

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    No idea what Best has to offer but probably could get from local hydraulics supplier.
     
  20. IanU

    IanU Member

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    The pressure will decrease as the tank cools, not increase.
     

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