Functional Description
Flow Computer Tasks
Thermo Fisher Scientific
AutoPILOT PRO Flow Computer User Guide 10-3
Caution
The water content equation used for the full calculation method is
not an AGA sanctioned equation. Care should be taken in custody transfer
applications. For custody transfer applications, the manual or partial
calculation methods should be used using lab results or AGA test methods
for determining water vapor content.
Fws
A full well stream factor is provided for production applications that
require compensation for well stream conditions. This value defaults to 1.0
and is a direct multiplier into the flow rate equation.
A 10-point break-pair table of K-Factor versus Frequency is utilized for the
linearization of turbine meter K Factors. Individual tables are used for each
meter run configured as a linear meter. Interpolation of the K-Factor
between table points may be enabled and disabled on an individual meter
run basis.
Users may configure the AutoPILOT PRO flow computer to support one
of the four averaging techniques as outlined in the API Ch 21.1.
1.
Flow dependent time-weighted linear averaging
2.
Flow dependent time-weighted formulaic averaging
3.
Flow weighted linear averaging
4.
Flow weighted formulaic averaging
For differential type meters, the square root of the measured differential
pressure is used as the weight value in averaging techniques 3 and 4. For
linear type meters, the Actual Flow Delta Volume is used as the weight
value.
A calibration routine is used for all analog inputs. The unit is capable of 2-
or 3-point calibrations as well as a single point for re-zero. All calibration
changes are logged in the audit trail with the old and new values for each of
the calibration points.
The unit also allows for the verification of all analog inputs through an As
Found / As Left procedure as outlined in the API Ch 21.1. Separate audit
codes are used for As Found versus As Left audits.
Turbine Meter
Linearization
Averaging
Techniques
Calibration/As
Found/As Left
