Recent content by jamese

  1. J

    Pressure variation

    (assuming no change in system volume) I clarified this further with my colleague (PHD in physics and works with fluid dynamics). Weirdly (to me anyway) apparently the pressure will change at the top and bottom of the pipe. The difference between top and bottom varies in accordance with rho x...
  2. J

    Pressure variation

    Thanks for your response. OK agreed on the pressure difference between both ends varying in accordance with vertical distance. With respect to whether pressure varies at both ends or just one end; I am tempted to believe that pressure just varies at the lower end, in accordance with rho x g x...
  3. J

    Pressure variation

    To phrase the question another way; Imagine we have a vertically orientated closed liquid filled pressurized pipe. The pipe is shaped like a spring; such that the vertical distance between the two ends can be varied whilst keeping it liquid filled. If we vary the vertical distance between the...
  4. J

    Pressure variation

    Hello, I mean a total variation of 10m. 5m up and 5m down, Thanks
  5. J

    Pressure variation

    If we have a water filled horizontal pipe on seabed with 200 bar in it. And boat with a flexible downline is connected to the pipeline in 100m of water depth. a) If the vessel bobs up and down by 5m I think that the pressure in the pipeline read at vessel changes by 0.5 bar each way, due to...
  6. J

    Vapor Pressure and non ideal gases

    OK it just got a lot more complicated! The reason for this query is that I will be involved in the dewatering of a gas export pipeline, using a pig train propelled by export gas, operating at export pressure. The water ahead of the pig train is separated from the export gas by several pigs...
  7. J

    Vapor Pressure and non ideal gases

    At higher pressures (100 bar plus) do we have to be more concerned with dissolved gasses, or is the effect still negligible? If I have the vapor pressure of a vapor in a gas at atmospheric system pressure, or low system pressures where vapor pressure is a constant. How do I then find the vapor...
  8. J

    Vapor Pressure and non ideal gases

    In two mails up you mentioned the solubility of something in the liquid phase affecting the partial pressure. Will the solubility of a gas, for example carbon dioxide (in gaseous form) in water also effect the partial pressure of the water vapor? Thanks
  9. J

    Vapor Pressure and non ideal gases

    OK thanks. Am I correct in believing what you describe with respect a soluble species is described by Raoult's law?
  10. J

    Vapor Pressure and non ideal gases

    OK thanks. In the low pressure ideal gas situation; does the partial pressure of the water vapor depend on the particular gas in the system? Thanks
  11. J

    Vapor Pressure and non ideal gases

    OK thanks noted about the units. I converted the mass per mass graph, to give the mass of vapor per actual volume. This then showed that the mass of vapor per actual volume remains constant at varying system pressures less than 10 atm. This is because the system is behaving as an ideal gas at...
  12. J

    Vapor Pressure and non ideal gases

    So for pressures less than 10 atm whilst this system behaves as an ideal gas, then the amount of water vapor that air can hold is constant (on an actual volume basis) and varies only as function of its temperature. In the less than 10 atm situation is the partial water vapor pressure the same...
  13. J

    Vapor Pressure and non ideal gases

    I found a graph for air water mixtures. At the lower end of the pressure curves the grams of vapor per actual volume remains constant, regardless of the pressure. However, as pressure increase the lines start to curve, showing that this relationship is no longer constant and there is less...
  14. J

    Vapor Pressure and non ideal gases

    OK thanks. Is the vapor pressure directly related to a grammes/actual volume in the cylinder? And is the value for grammes/actual volume the same for both cylinder situations?
  15. J

    Vapor Pressure and non ideal gases

    Thanks for the replies. I will take a step further back...because I think I might understand even less than I originally thought! I have a cylinder full of water and air at a particular temperature, if the air is saturated then the air has a particular water vapor pressure. If I then compress...
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