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Air cylinder blanking cap?

Discussion in 'Anything Airgun Related' started by mattgriff88, Jan 30, 2014.

  1. mattgriff88

    mattgriff88 Busy Member

    Messages:
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    Location:
    Merthyr Tydfil
    I have just bought a blanking cap for my air cylinder.

    Its a 300 bar 12Litre cylinder do I just screw the blanking cap in and open the valve to max to see how many bar is left in the cylinder?
     
  2. Clubshot

    Clubshot Clubshot

    Messages:
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    Location:
    North London. England
    Yes , as long as Air Gauge is still fitted

    Some Fittings remove Gauge - before fitting cap -

    BOB/R
     
  3. terry1001

    terry1001 Major Poster

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    Location:
    Ipswich
    As long as there is a bleed screw betweeb the bottle and the end cap or youll never get it apart.
     
  4. mattgriff88

    mattgriff88 Busy Member

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    Location:
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    ok its showing 190 bar when opened fully, means nothing to me however?
     
  5. DenTB

    DenTB Donator

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    Location:
    Perth Scotland
    A dive bottle is pressure rated to 300bar that does not mean youll get 300 bar when filled. Normally ,as a guide 200 /220 is full. When you release the air by the wheel mech and it goes shhh ,your ready to refill your gunbottle. Please bear in mind do any opening of the valves SLOWLY, ask the guy at your fillcentre to top it up if he can you ll get a good 20 bar extra and it all goes a long way refilling your gun. Fill pressure will drop when the 12 litre has cooled. Youll get lots of fills from it , just a little yabber from an old Trimix Gas Blender ,tech Diver, good luck
     
  6. metalman

    metalman Big Poster

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    Location:
    Devon
    When i take my 12ltr 300bar to be filles, i get my 300 bar. 220 bar would not even fill my Ultra :D
     
  7. Clubshot

    Clubshot Clubshot

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    Location:
    North London. England
    Most Shop compressors cut out at 305 Bar - Cool down to around 280/90 Bar

    190 Bar means it needs topping up for most gun's - Most Guns need minimum of 200 Bar

    Will be able to get a couple of top up's - But not if the Gun has a built in regulator

    BOB/R
     
  8. splat

    splat Donator

    Messages:
    445
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    Location:
    hucknall, nott's
    rough basic are;
    1 bar is approximately 1 atmosphere pressure ( for quick math =15 lbs per square inch).
    As cylinder volume is 12 litres that means 12lts of air in cylinder for every Bar of pressure (12lts x 300 Bar = 3,600 lts of air).
    300 bar = 4,500 lbs per square inch pressure (roughly).
    because you can only decant air from high to low (until pressure balances) if charging rifle to 200 bar only 100 bar from cylinder can be used (300 down to 200).
    HTH.
     

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