Cylinder Pressure

Discussion in 'Carbon Dioxide (CO2)' started by Midnight, 5 Jan 2009.

  1. Midnight

    Midnight Member

    Joined:
    2 Sep 2008
    Messages:
    48
    Location:
    North Yorkshire
    Hi
    Murphy's law - my CO2 ran out on 30th December and the nearest refill centre was closed until January 3rd. As I was also away for the New Year festivities I put the cylinder in the boot of my car, where it stayed in below freezing temperatures until yesterday when I managed to get a refill.

    The chap at the refill centre was surprised how easily the 2kg bottle filled, apparantly they normally have to 'fill' them twice, once to get the temperature down enough to then get the correct weight of liquid gas inserted. He even had to let some out to make the correct weight.

    Several hours after I reconnected the system which is housed in the cabinet below the tank I was surprised to see the pressure guage showing 160bar. Being a bit concerned I removed the bottle to the garage overnight. :wideyed:

    I rang the refill centre but tthe chap there didn't seem overly concerned as he was positive he had added the correct weight. He suggested I release some gas by opening the needle valve and the tap on the pressure reducer or removing the reducer and gently opening the main valve for a few seconds. Not wishing to waste too much gas I opened the reducer valves and when it dropped to around 100 bar I reconnected the system. That was around noon today. It's now 7.25pm and the pressure guage has stayed at 120 bar for a couple of hours now at a room temperature of around 20oC.

    I read somewhere that the safety valve on these bottles blows off at 3000psi so maybe I'm overly nervous. To be safe I have now positioned the bottle outside the tank cabinet as presumably if the saftey valve blew it would take the side of the cabinet out with disasterous consequences for the tank.

    This is the first time I've had to refill so not sure if this is all quite normal or if I should release some more gas?
     
  2. GreenNeedle

    GreenNeedle Member

    Joined:
    19 Jul 2007
    Messages:
    2,706
    Location:
    Lincoln UK
    When I was working at a welders earlier this year the 25kg bottles were at that kind of pressure.

    AC
     
  3. Themuleous

    Themuleous Member

    Joined:
    6 Jul 2007
    Messages:
    4,126
    Location:
    Aston, Oxfordshire
    Humm interesting. Sounds like you might have got quite a bit of CO2, always a good thing!

    Sam
     
  4. Midnight

    Midnight Member

    Joined:
    2 Sep 2008
    Messages:
    48
    Location:
    North Yorkshire
    Apparantly not. I've been reading some horror stories about overfilled bottles and high temperatures. Mine seems to have settled down to around 100bar which is still a little high. A 100 bar is about 1450 psi so hopefully I will be ok. At 170bar (2465 psi) it was a bit too close to the disaster level. I hardly let any gas out so I suspect 'cold' bottles only need be slightly over-filled to become a risk when you bring them into a warm room.

    http://www.thekrib.com/Plants/CO2/co2-rocket.html#2
    don't read this if you are the nervous type!
     

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