Flow-X─ Function Reference
4-225
Flow-X General functions - fxISO5167_Orifice
Drain hole
When input value is > 0 then an additional correction
on the orifice diameter will be applied to account for
the drain hole, as explained further on.
mm
0
Function outputs
Remark
EU
Fallback
Status
0: Normal (No error condition)
1: Input argument out of range
2: No convergence
Mass flow rate
The calculated mass flow rate
kg/s
0
Beta ratio
Orifice to pipe diameter ratio at upstream temperature
-
0
Orifice diameter
At the upstream temperature and optionally with a
correction for the drain hole
mm
0
Pipe diameter
At the upstream temperature
mm
0
Upstream pressure
Pressure at upstream tapping (p
1
)
bar(a)
0
Pressure at
downstream tapping
Pressure at downstream tapping (p
2
)
bar(a)
0
Recovered
downstream pressure
Fully recovered downstream pressure (p
3
)
bar(a)
0
Upstream temperature
Temperature at upstream tapping (t
1
)
°C
0
Temperature at
downstream tapping
Temperature at downstream tapping (t
2
)
°C
0
Downstream
Temperature
'Fully recovered' downstream temperature (t
3
)
°C
0
Upstream density
Density at upstream tapping (
1
)
kg/m3
0
Density at downstream
tapping
Pressure at downstream tapping (
2
)
kg/m3
0
Downstream density
'Fully recovered' downstream density (
3
)
kg/m3
0
Reynolds number
The pipe Reynolds number (this is the Reynolds number
upstream of the orifice and not the one within the device
throat itself
-
0
Discharge coefficient
-
0
Expansion Factor
-
0
Velocity of Approach
-
0
Pressure Range
0: Pressure is in valid range
1: Pressure is out of valid range
-
0
Reynolds Range
0: Reynolds number is in valid range
1: Reynolds number is out of valid range
-
0
Diameter Range
0: Device and pipe diameter and Beta ratio in valid range
1: Device diameter, pipe diameter and/or Beta ratio out of
valid range
-
0
Pressure correction
The relation between the pressure at the upstream tapping p
1
and the pressure at the
downstream tapping (p
2
) is as following:
1000
/
1
2
p
p
p
The relation between the pressure at the upstream tapping and the fully recovered pressure
(p3) is as following:
LOSS
p
p
p
1
3
The calculation of P
LOSS
is as defined in the standard.
Summary of Contents for flow-x
Page 1: ...Function Reference Certified flow calculations Flow and batch calculations Worksheet functions...
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