Emerson Daniel 3415

Note that for the temperature-effect expansion correction factor to be calculated, the
correction must be enabled (via the EnableExpCorrTemp data point) and the flow-
condition temperature must be available (i.e., the EnableTemperatureInput data point
must be set to 'Live'(1) or 'Fixed'(2), see Equation 4-13). The temperature-effect calculation
is shown in Equation 4-13. If the temperature-effect expansion correction factor is not
calculated, it is set to 1.0.
Temperature-effect expansion correction Equation 4-13:


= 1 + 3 ×  × 

 

Equation 4-13
ExpCorr
T
=
expansion correction factor due to temperature (dimensionless)
(ExpCorrTemperature)
α =
pipe linear expansion coefficient due to temperature (K-1) (LinearExpansionCoef)
T
f
=
flow-condition temperature (K) (FlowTemperature)
T
ref
=
reference temperature for the pipe linear expansion coefficient (K)
(RefTempLinearExpCoef)
4.5.5 Profile-effect correction
For meter types that require profile-effect correction, the correction factor can be either
user- specified or meter-calculated depending upon the value of the SpecCorrectionFactor
data point: if set to 0.0, then the correction factor is meter-calculated; if set within [0.90,
1.05], then the specified value is used.
Calculating the meter factor requires that the flow-condition pressure and temperature be
live or fixed and that the AGA8 calculations are performed either internally or externally. If
the profile-effect correction factor is to be meter-calculated but either the flow-condition
pressure and/or temperature are/is disabled or the AGA8 calculations are not performed,
then the flow- condition correction factor is set to the default value of 0.95. Otherwise, it is
calculated as shown in Equation 4-14.
Profile-effect correction factor Equation 4-14:
 = 1 +
0.242
log 0.2703



+
0.835
Re
0.8
where
Equation 4-14
CorrFctr =
flow-profile correction factor (CorrectionFactor)
WR =
pipe wall roughness (m) (WallRoughness)
D
in
=
pipe inside diameter (m) (PipeDiam)
Measurement
28 3410 Series Gas Ultrasonic Flow meters