16 .7 pressure correction factor to base, 16 .8 line density, 16 .9 mass flow [t/h – KROHNE Summit 8800 Vol 2 User Manual
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08/2013 - MA SUMMIT 8800 Vol2 R02 en
SUMMIT 8800
APPENDIX 2: GAS CALCULATIONS
17
K1
API constant [-]
K2
API constant [-]
ρb
Base density [kg/m³]
NOTE:
API constants K0…K2 are set for refined product.
16 .7 Pressure correction factor to base
The pressure correction factor Cpld is calculated by inserting the gauge version of the duty
stream pressure in:
g
pld
b
P
1
1
C
−
=
Equation 16 Liquid pressure correction
Where b is calculated by inserting the duty stream temperature in:
4
2
3
2
6
1
0
*
*
1
0
*
2092
.
4
1
0
*
87096
.
0
*
00021592
.
0
6208
.
1
exp
−
+
+
+
−
=
b
b
T
T
b
ρ
ρ
Equation 17 Liquid compressibility calculation
Cpld
Correction for liquid pressure at the duty stream [-]
Pg
Stream pressure [bar(g)]
b
Oil compressibility factor [1/bar]
T
Duty stream temperature [C]
ρb
Base density [kg/m³]
16 .8 Line density
The flow computer calculates the line density, based on the base density in-use from GC, ac-
cording to the API-2540 standard.
The Line density is then estimated according to:
b
pld
tld
l
C
C
ρ
ρ
*
*
=
Equation 18 API line density
ρb
Base density [kg/m³]
ρl
Fully-corrected line density [kg/m3]
Ctld
Correction for liquid temperature at stream [-]
Cpld
Correction for liquid pressure at the duty stream [-]
16 .9 Mass flow [t/h]
1000
*
l
v
m
q
q
ρ
=
Equation 19 Gross mass flow