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Calculations help

  1. May 16, 2012 #1
    Hi Folks,

    Not the best at this so hoping somebidy can help me.

    I have a 67.4 litre vessel and I'm filling it with SF6 to 6Bar. Can I work out how much SF6 I'm using in litres?

    Is this a dumb question? should nI be asking what weight I'm using.

    I've been asked to supply usage in litres.
     
  2. jcsd
  3. May 16, 2012 #2

    Q_Goest

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    Hi Scara. I can give you the density of SF6 if you can provide the temperature and verify the pressure is gage and not absolute pressure.
     
  4. May 16, 2012 #3
    The sf 6 is at room temperature around 20deg Celsius . Pressure measured on vessel with gage.
     
  5. May 16, 2012 #4

    Q_Goest

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    At 6 barg and 20 C, density is roughly 46.5 kg/m3. The saturation temperature at this pressure is -19 C and at atmospheric pressure the saturation temperature is -68 C.

    So at this pressure and temperature, you have a superheated gas. I'm not sure why or how you could put that into liters, but I wonder if there is a liquid source and you're being asked to determine how many liquid liters are needed for this 64.7 L vessel, in which case you need to define the conditions of the liquid source.
     
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