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- \B2.0 USING 'ISO'\b
-
- \BSTEP 1:\b
- Install the program:
-
- a) DOS version:
- Put the program diskette in drive A and type: A:\\INSTALL
- This will install the DOS-programs in directory C:\\ORIFICE
- or show you how to install the program in a directory of your
- choice.
-
- b) Windows version:
- The Windows version of the program uses the Visual Basic 3.0
- runtime DLL. Put the program diskette in drive A. From
- the Microsoft Windows Program Manager, choose RUN from the
- FILE menu and type: A:\\SETUP or double-click on the SETUP.EXE
- file in drive A. Setup will copy the program to directory
- C:\\ORIFICE unless you make your own choice. If you want the
- program-icon to appear in another group window, move it to
- where you want 'ISO' to be and delete the window group
- made by Setup. Save your selections.
-
- \BSTEP 2:\b Start the program by typing "ISO" from the DOS-prompt,
- or 'click' on the correct icon:
-
- FLOW -ORIFICE
-
- FLOW-ORIFICE CALCULATION PROGRAM
-
- International Standard ISO 5167-1:1991
- -------------------------------------------------------------------
-
- Copyright (C) 1996 by B. K. Berge (Version 4.0)
-
-
- The Disclaimer is shown before the main menu appears:
-
- Gas Orifice
- Liquid Orifice
- Restriction Orifice - Gas
- Restriction Orifice - Liquid
- EXIT
-
-
- \BSTEP 3:\b Calculation Options:
-
- After choosing type and method of calculation the input-screen
- will appear. For gas-calculations you have to enter specific
- gas gravity, temperature and pressure. You can also give
- molefractions of N2, CO2 and H2S for sour gas calculations.
-
- The AGA-8 equation is used for calculating Z-factor
- (compressibility factor) for natural gases. The equation is
- complex, and calculation time may be long depending on your
- computer-type. The Redlich-Kwong equation of state is used
- for air and nitrogen.
-
- For oil-calculations you have to enter specific oil gravity,
- temperature and pressure. It is also recommended to give
- molecular weight of oil. For water-calculations the input
- requirements are salinity, temperature, and pressure.
- NOTE: It is assumed that all dissolved solids for water are
- expressed as equivalent sodium chloride concentration. The
- results are an orifice specification sheet giving the necessary
- data for design of an orifice or evaluating an existing orifice.
-
-
- \BSTEP 4:\b Interpreting the results:
-
- The results will contain a few factors that you should know:
-
- \UISO 5167-1:1991\u
-
- The basic flow equation is:
-
- Qm = C*E*Eps*Pi/4*OD^2*Sqrt(2*dP*Roh)
-
- where
- Qm = Mass flow rate (kg/s)
- C = Discharge coefficient = Alpha/E
- E = Velocity of approach factor = 1/(Sqrt(1-Beta^4))
- Eps = Expansion factor due to pressure drop
- Pi = 3.14159
- OD = Orifice diameter at actual flowing conditions
- dP = Differential pressure across orifice
- Roh = Density of flowing fluid measured at upstream tap
-
-
- The flow coefficient is given above as:
-
- Alpha = C * E
-
- and the orifice to pipe diameter is:
-
- Beta = OD/PID
-
- The definition of the factors are given in Ref. 1.
-