2012981-001 rev. AB
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If ( gb < 0.5 )
VCF = 1.0.
If K0, K1 and K2 factors are all 0.0, VCF = 1.0.
Table 1 shows recommended liquid type, gravity range and VCF k factors.
Table 1 Recommended Liquid Type
Liquid Type
Base Gravity Range
K0
K1
K2
Crude oils (2)
0.611 – 1.076 341.0597
0.0
0.0
Lubricating oils (3)
0.800 – 1.164
0.0
0.3488
0.0
Gasoline/napthene 0.653
–
0.7705 192.4571
0.2438
0.0
Jet fuels/gasoline
0.771 – 0.7885 1489.067
0.0 -0.0018684
Jet fuels kerosene/solvents
0.789 – 0.8395
330.301 0.0
0.0
Diesels/heating and fuel oils 0.840
–
1.075
103.872 0.2701 0.0
It should be noted that K0, K1 and K2 factors apply only when
base gravity (gb) is greater than 0.6110 and the liquid type is
not
water.
K0, K1 and K2 values, as well as base gravity, heating value (if
required) and viscosity, are not calculated by the device or
PCCU. The user must manually enter the K0, K1 and K2 values
from the table shown above. The base gravity, heating value and
viscosity must be obtained from other sources and manually
entered. Entries for these values do not change automatically
when liquid type is changed. Correct values must be entered
from the PCCU entry screens.
3.2.8
Heating Value (BTU/scf)
The Heating Value (BTU/scf) is used to calculate energy for the log and day period
records that are stored in the application’s historical database. Energy is the heating
value in BTU/scf, multiplied by the volume in scf. This is then accumulated over the log
and day periods.
3.3 Limits
Tab
The Limits tab (see Figure 4) contains the settings for static and differential pressures,
temperature and flow rate high and low limits.
The high and low limits are compared, each second, against the appropriate
application value. When a limit is exceeded, it is recorded each second and show in
the day period historical data views and reports as percentage (%) of time below or
above the limit. It is also shown in the Alarms and Detail sections for flow data
collection views.