Flow-X─ Function Reference
4-307
Flow-X General functions - fxVCone_C
fxVCone_C
Description
This function calculates the mass flow rate for a measured differential pressure over a McCrometer V-
Cone meter in U.S. customary units.
The calculation, as specified by the meter supplier, is essentially a modified ISO 5167 flow rate
calculation. As opposed to ISO-5167 the discharge coefficient is a function input. Because the discharge
coefficient is a function of Reynolds number an optional calibration correction needs to be applied
outside this function.
Compliance
McCrometer: Flow Calculations for the V-Cone Flow meter Literature part #24509-54 Rev 3.1/02-05
2005
Function inputs and outputs
Function inputs
Remark
EU
Range
Default
Name
Optional tag name, tag description and tag
group
Differential
Pressure
Differential pressure over the V-Cone device
measured at the up- and downstream
pressure taps
inH2O
@ 60°F
0..100
0
Pressure
Upstream pressure value of the fluid at
metering conditions
psia
0..30000
0
Temperature
Down- or upstream temperature of the fluid
at metering conditions
°F
-400
..2000
0
Density
Down or upstream density of the fluid at
metering conditions
lbm/ft3
0..200
0
Dynamic Viscosity
Dynamic viscosity of the fluid
lbm/ft.s
0..10
6.9e-6
Isentropic
Exponent
Also referred to as
(kappa). For an ideal gas
this coefficient is equal to the ratio of the
specific heat capacity at constant pressure to
the specific heat at constant volume.
According to the ISO standard this ratio may
be used, when the real value is unknown.
-
0..10
1.3
Pipe Diameter
Internal diameter of the pipe at reference
temperature
inches
0..100
0
Pipe Expansion
factor
The thermal expansion coefficient of the
pipe material
1/°F
0..1e-4
6.2e-6
Pipe Reference
temperature
The reference temperature that corresponds
to the 'Pipe diameter' input value
°F
-
400..2000
68
Cone Diameter
Cone diameter at reference temperature
inches
0.. 'Pipe
Diameter'
0
Cone Expansion
factor
The thermal expansion coefficient of the
Cone material
1/°F
0..1e-4
9.25e-6
Cone Reference
Temperature
The reference temperature that corresponds
to the 'Cone diameter' input value
°F
-400
..2000
68
Configuration
The type of McCrometer V-Cone meter.
This setting is used to select the appropriate
equation for determination of the gas
expansion factor as specified by McCrometer
1: Standard V-Cone
2: Wafer-Cone
Note of input 'Fluid' is set to 'Liquid', then
this input is not used (because the expansion
factor is set to 1)
-
1
Содержание flow-x
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