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200 Volumetric flow rate
Section 6: Meter operation Reference, Installation, and Operations Manual
June 2013 3-9000-743 Rev S
Equation 6-18 Reynolds number
where
Base-condition volumetric flow rate
The base-condition volumetric flow rate is the result converting the flow-condition volumetric
flow rate to the base pressure-temperature condition. This conversion requires (1) AGA8
calculations to be either performed internally (i.e., by the meter) or externally (with the
resulting compressibilities specified to the meter via the SpecZFlow and SpecZBase data
points), and (2) the flow-condition temperature and pressure to be live or fixed. If AGA8
calculations are not performed (i.e., neither internally nor externally) or the flow-condition
temperature and/or pressure are/is not enabled, then the base-condition volumetric flow rate is
set to zero.The base-condition volumetric flow rate is calculated as shown in Equation 6-19.
=
Reynolds Number (dimensionless) (ReynoldsNumber)
MAX =
maximum function that takes the maximum of the values
within the brackets
=
factor to (approximately) correct for velocity profile effects
(0.94 for JuniorSonic
TM
meters, 1.00 for SeniorSonic
TM
meters) (dimensionless)
=
geometric constant, pi (dimensionless) (3.14159...)
=
“raw” volumetric flow rate (m
3
/h) (QMeter)
=
natural gas mixture mass density at the flow condition
(either calculated as part of internal AGA8 calculations or
specified via SpecRhoMixFlow) (kg/m3) (RhoMixFlow)
=
pipe inside diameter (m) (PipeDiam)
=
dynamic viscosity (Pa•s) (Viscosity)
Re MAX PathFactor()
4
π
---
Q
Raw
ρ
P
f
T
f
,()
D
in
μ
--------------------------------
10
4
,=
Re
PathFactor
π
Q
Raw
ρ
P
f
T
f
,()
D
in
μ