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  1. DrCaddy

    passing variables from workspace to function

    Thank you brokensoul. The link was quite useful.
  2. DrCaddy

    passing variables from workspace to function

    Hi, I have a few scripts that produce some variables in the workspace. I have a function which also needs to work on the variables. Should I declare the variables as global in the script also to make it visible in the function? How to handly this? TIA, drcaddy
  3. DrCaddy

    Elevation correction for pressure

    RGasEng: Is there a formula to compute the average compressibility?
  4. DrCaddy

    Average pressure in gas pipe

    Sailoday28: Sorry for the late reply to your post on the 25th. I was trying to familiarise myself with the equations and calculations related to pressure. I think it might take me ages to learn them all. Pressure at the inlet and density of the gas at the inlet are known. The flow...
  5. DrCaddy

    Elevation correction for pressure

    Thank you zdas04 and RGasEng. I am sorry I left a few rather important details of the system in my post => that my system is a nitrogen system and that in the calculation the effect of temperature change is neglected completely and the flow rate through the pipe is assumed to be constant. These...
  6. DrCaddy

    Average pressure in gas pipe

    quark: If you multiply and divide the right-hand side of the equation metengr wrote by (P1-P2) then you will come to the equation RGasEng has written. Thank you everybody for the posts. Since the result of average pressure calculations are used for further calculation of other parameters...
  7. DrCaddy

    Average pressure in gas pipe

    Thank you TD2K and JStephen for your ideas. Shock waves are not a concern because the calculations are for the system in steady-state. Moreover the system does not have an external source to feed it other than its own nitrogen cylinders. As TD2K said, I was concerned how the plot of pressure...
  8. DrCaddy

    Average pressure in gas pipe

    Dear metengr, I was not quite sure if the average of the terminal pressures will give the average pressure in the pipe. Since the system involves high pressure, I thought, the change in pressure over the length of the pipe might be non-linear and hence some complicated formula might be...
  9. DrCaddy

    Elevation correction for pressure

    Dear Friends, In NFPA regulations, I have seen elevation correction in the calculation of pressure for pipes carrying CO2(Reason stated: Density of CO2 varies with height especially if the change in elevation is as high as 50 feet). Is such a correction necessary for my system also which...
  10. DrCaddy

    Average pressure in gas pipe

    Hi Firends, This is my first post. Please tell me if made any mistake in the explanation of my problem. There is a high pressure gas pipe of uniform CSA - fixed installation - carrying nitrogen from a cylinder to nozzle. I need to calculate the average pressure in a certain...

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