KROHNE Summit 8800 Vol 2 - Manual (Page 180)

180 www.krohne.com 08/2013 - MA SUMMIT 8800 Vol2 R02 en
SUMMIT 8800 APPENDIX 2: LIQUID CALCULATIONS 16
16 .3 Perform meter body correction
The system corrects the volume flow for the impact of pressure and temperature on the geom-
etry of the flanged meter body according to ISO standard 17089-1.
Simplified direct single-stage calculation is used which estimates the effect for pressure and
temperature:
1) Body temperature effect
( )
T =
Q
Q
ature bodytemper
∆ +






* * 3 1
0
1
α
Equation 8 Meter body temperature effect
Where:
Q1/Q0 flow correction factor for the meter output [-]
α thermal expansion coefficient [K-1]
ΔT temperature difference [K]
With:
cal op
T T = T
− ∆
Equation 9 Delta temperature
Where:
Top Field operation temperature [K]
Tcal Calibration temperature [K]
2) Body pressure expansion





 ∆






+
−
+
+






E
P
R a
R a
=
Q
Q
re bodypressu
* * 4 1
2 2
2 2
max 0
1
σ
Equation 10 Meter body pressure expansion
Where:
Q1/Q0 correction factor for the meter output [-]
R inside pipe radius [m]
α outside diameter of the meter body [m]
σ Poison’s ratio [-]
ΔP pressure difference [Pa]
E modulus of elasticity [Pa]
With:
cal op
P P = P
− ∆
Equation 11 Delta pressure
Where:
Pop Field operation pressure [Pa]
Pcal Calibration pressure [Pa]