Troubleshooting – Yokogawa digitalYEWFLO (DY) User Manual
Page 98
TROUBLESHOOTING
IM 1F2B4-01-YIA
Page 93
Q
n
Volumetric flow at standard conditions
Q
f
Volumetric flow at operating conditions
ρ
f
Density at operating conditions (B14 or B19)
h
f
Specific enthalpy (kcal/kg), (Btu/lb) (B20)
T
n
Standard temperature
P
f
Operating pressure (kg/cm
2
abs), (psia)
P
n
Standard pressure (kg/cm
2
abs), (psia) (B27)
K
Deviation factor for gas (B28)
ρ
n
Density at standard temperature and standard pressure (kg/Nm
3
), (lb/scf)
F
S
Flowrate span (B52)
T
E
Total rate (C01)
D
Internal diameter (m), (inch) (B03)
µ
viscosity (cP)
ρ
f
Density at operating conditions (kg/m
3
), (lb/ft
3
)
•Conversion factors
Unit conversion factors:
U
k(kg)
, U
k
(cal), U
k
(Nm
3
), U
k
(m
3
), U
k
(lb),
U
k
(Btu), U
k
(scf), U
k
(acf)
Kilogram conversion factors:
U
k(kg)
= 1 for a kilogram
U
k(kg)
= 0.001 for a metric ton
Actual cubic feet conversion factors:
U
k(acf)
= 1 for acf
U
k(acf)
= 7.481 for a gallon
K-factor conversion factors:
U
kt
1/1000 (litre m
3
)
U
kt
0.3369 (USgal to actual cubic feet)
User's unit conversion factor
U
k
= U
k
(user) (C09)
For more information, refer to How to setup user defined units in the How to section of this manual.
6.3.2
Flow conversion factor (U
k
)
Flow conversion factor U
k
is obtained from the following computation depending on the fluid selected
(B04) and the flow units.
•Steam
M (Mass flowrate)
U
k
=
ρ
f
* U
k
(kg)
U
k
=
ρ
f
* U
k
(lb)
H (Heat quantity)
U
k
= U
ρ
f
* h
f
*Uh
f
* U
k
(kg)
U
k
= U
ρ
f
* h
f
*Uh
f
* U
k
(lb)
Qf (Flowrate at operation)
U
k
= U
k
(m
3
)
U
k
= U
k
(acf)
•Gas
Qn (Flowrate at STP)
U
k
= P
f
* T
n
+ 273.15 * 1 * U
k
(Nm
3
)
P
n
T
f
+ 273.15 K
M (Mass flowrate)
U
k
=
ρ
f
* U
ρ
f
* U
k
(kg)
U
k
=
ρ
f
* U
ρ
f
* U
k
(lb)