Aalborg Vortex Insertion - Manual (Page 53)

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Changing of the flowing fluid settings will affect the way how flow meter calculates
fluid Density and therefore will affect Mass flow rate reading. For 3 liquids: Water,
Ammonia and Chlorine and for 10 real gases: Air, Argon, Ammonia, CO, CO2,
Helium, Hydrogen, Methane, Nitrogen, Oxygen all parameters required for den-
sity calculation are preprogrammed at the factory and stored in flow meter ROM
memory. When listed above fluids are selected, there is no need to enter or change
any additional parameters, meter will calculate Density and Mass flow rate auto-
matically based on actual (temperature and pressure) flowing conditions.
5.3.9.2 Submenu L2 Goyal-Doraiswamy Menu
If “Other Liquid” is selected as flowing fluid the flow meter is using Goyal-
Doraiswamy equation for fluid density calculation. Following parameters related to
flowing liquid have to be entered:
Molecular Weight (Lb/LbMol)
Critical Pressure (PSIA)
Critical Temperature (deg. R)
Critical Compressibility Factor (no units)
See Richard W. Miller, Flow Measurement Engineering Handbook (Second Edition,
1989), page 2-67 for definition and use of the Goyal-Doraiswamy equation.
NOTE: For flow meters equipped with optional T/P hardware the
temperature and pressure measurements are taken from temperature
and pressure transducers. If flow meter is not equipped with optional
T/P transducers the actual flowing Temperature and Pressure have to
be entered using Sub Menu L2 “Actual Flowing Conditions”
(see paragraph 5.3.9.6).
,
NOTE: Before selecting “Other Liquid” menu selection make sure
correct parameters required for fluid density calculation are entered in
Sub Menu L2 Goyal-Doraiswamy (see paragraph 5.3.9.2).
,
NOTE: Before selecting “Oil” menu selection make sure correct
parameters required for fluid density calculation are entered in Sub
Menu L2 API 2540 (see paragraph 5.3.9.3).
,
NOTE: If “Natural Gas” or “Other Gas” menu selection has to be made,
make sure correct parameters required for fluid density calculation are
entered in Sub Menu Nat Gas AGA8 or Sub Menu Other Gas
correspondingly (see paragraphs 5.3.9.4 and 5.3.9.5).
,