Hardware manual

Chapter 2 - TeleFlow Standard ACCOL Load
TeleFlow™ 2-7 Standard ACCOL Load
The flow control is active and not close to the setpoint.
Super-compressibility (F
pv
) and Compressibility ( Z
s
, Z
b
, Z
f
)
When the 1985 AGA3 calculation is selected, the Super-compressibility (F
pv)
value
is calculated using the NX-19 equations. When the 1992 AGA3 calculation is used
the Flowing (Z
f
) and Base (Z
b
) compressibility factors are calculated using either the
AGA8Detail or AGA8Gross module. The AGA8Gross module provides either the
G,C,N or HV, G, C modes.
If the Base Pressure or Base Temperature differ from Standard conditions (14.73
psia, 60
o
F) and the 1992 AGA3 calculation is in use, an AGA8Detail or AGA8Gross
module will be executed to calculate standard compressibility Z
s
for the defined gas
composition. The calculation of Z
s
will be done once per minute or whenever a
related gas constant changes.
Flow Rates
Gas Flow-rate is calculated in mscf/hr using an AGA3Term module if the 1985
calculation is selected, otherwise the AGA3Iter module (1992 calculation) is used.
Because of MPMS requirements the Extension value is supplied to these modules
externally.
Flow rate in mscf/hr is converted to mscf/day and is available for reading.
Flow Rate Alarm
The flow rate signal is an alarm signal with default alarm limits (in mscf/hr):
Low 0
High 3000
Lo-lo 0
Hi-hi 5000
LDb 50
HDb 50
Flow Volume Totals
At the end of each Calculation interval the volume for that interval is added to
totals for the hour, day, current month and 'running' totalized volume. At the end of
each hour, day, and month the accumulated volume for that period is stored and