Baker Hughes Apollo 3, User Manual

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Copyright 2020 Baker Hughes Company. All rights reserved. Page 251 of 277
Figure 206: Pump Curve Screen
11.6 Pump Thrust Screen
The Pump Thrust Screen graphically illustrates the pump operating position over time. Its capability is
best illustrated in a condition where the
pump’s speed is changing. The Red and the Blue curves on
the graph are the Down-Thrust and Up-Thrust fault limits. The Green curve is the differential pressure
measured across the pump.
In the scenario at right, the SPS Setup wizard has been executed. By default, this wizard enables the choke
control PID using Differential Pressure as the feedback (control) value. Apollo uses the pump curve to
determine the Target Pressure (the differential pressure that causes the pump to run at its best efficiency
point or BEP) and controls the choke valve to achieve that pressure.
Notice that the drive starts up and runs for a while at 60 Hz. The frequency setpoint is changed to 40 Hz
and then later to 50 Hz.
As the drive frequency settles, the Valve PID adjusts the (simulated) choke valve to move the pump
performance to the best efficiency point.