Double Stage Cut With Working Monitor; Two Proportional Controllers Only - GE Becker VRP-SB-PID Series Instruction Manual

Example Application #6
Double Stage Cut with Working Monitor &

Two Proportional Controllers Only

This application is used for large pressure cuts, over
1000 psig (6895 kPa), across the station.
The intermediate pressure floats as load fluctuates.
Downstream pressure can fluctuate within proportional
band of the VRP-SB-PD controller. For a 3-15 psig (21-103 kPa)
output the proportional band is 23 psig (159 kPa).
In case of failure of working regulator, the working monitor
regulator will takeover control such acting as monitor.
DERIVATIVE
L=6
1500-2000 PSIG
10342-13790 KPA
FLOW
SPRING TO CLOSE GLOBE VALVE
WORKING MONITOR REGULATOR
KEY
OUTPUT PRESSURE
SENSING PRESSURE
© 2016 General Electric Company. All rights reserved.
VRP-SB-PD-40
REVERSE ACTING
HIGH GAIN
(SMALL RINGS)
INTEGRAL=0
(CLOSE VALVE)
DEAD BAND = 0
DERIVATIVE
L=3
900-1100 PSIG
6205-7584 KPA
SPRING TO OPEN GLOBE VALVE
WORKING REGULATOR
Becker VRP-SB-PID Series Natural Gas Controllers Instruction Manual | 20
VRP-SB-PD-40
DIRECT ACTING
INTEGRAL=0
(CLOSE VALVE)
HIGH GAIN
(SMALL RINGS)
DEAD BAND = 0
425-450 PSIG
2930-3103 KPA
TO COMPRESSOR
TURBINE